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Science MCQ (1 Marks)

Physical and Chemical Changes · MP Board (MPBSE) STD 7 (Madhya Pradesh - English Medium). 185 questions.

Questions · Page 2 of 4

MCQ (1 Marks)

MCQ 511 Mark
Chemical changes are $........:$
  • A
    Temporary, reversible and a new substance is produced
  • B
    Always accompanied by exchange of light
  • ✓
    Permanent, irreversible and a new substance is produced
  • D
    Never accompanied by exchange of light and heat energy
Answer
Correct option: C.
Permanent, irreversible and a new substance is produced
Chemical changes take place on the molecular level. A chemical change produces a new substance. It is a permanent and irreversible change.
Examples of chemical changes include combustion $($burning$),$ cooking an egg, rusting of an iron pan.
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MCQ 521 Mark
Boojho Is Writing About Physical Change. Read The Following Sentences And Choose The Incorrect One And Help Him:
  • A
    Evaporation and condensation sublimation are the example of physical change.
  • B
    There may be some changes in the physical properties such as state, colours, smell etc.
  • C
    The composition of the matter remains on unaltered.
  • ✓
    The physical change is usually permanent.
Answer
Correct option: D.
The physical change is usually permanent.
The physical change is usually temporarily
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MCQ 531 Mark
Adding sodium chloride to water is a:
  • ✓
    Physical change
  • B
    Chemical change
  • C
    Irreversible change
  • D
    None of these
Answer
Correct option: A.
Physical change
Physical changes are changes in the physical properties of substances. No new substances are formed in these changes.
The addition of sodium chloride to water does not result in the formation of any new substance, hence it is a physical change.
Also, sodium chloride can be reversed back to its original state by simple evaporation of water.
Therefore, it is a reversible change.
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MCQ 541 Mark
Which of the following is a chemical property of Aluminium?
  • ✓
    It corrodes with air.
  • B
    It is soft and malleable.
  • C
    It melts at $660^\circ C.$
  • D
    Its density is $2.70\ g/ cm^3.$
Answer
Correct option: A.
It corrodes with air.
It corrodes with air.
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MCQ 551 Mark
Physical change include change in:
  • A
    Texture
  • B
    Temperature
  • C
    Formation of bubbles
  • ✓
    Both $a$ and $b$
Answer
Correct option: D.
Both $a$ and $b$

The texture of a substance can differ with a physical change. For example, if a piece of wood was sanded, waxed, and polished, it would have a very different texture than it initially had like a rough piece of wood. Although, we cannot see temperature change, unless if a change of state is occurring, so it is a physical change.

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MCQ 561 Mark
What conditions are required for rusting to take place?
  • A
    Water only
  • B
    Oxygen only
  • ✓
    Water and oxygen
  • D
    Water and carbon dioxide
Answer
Correct option: C.
Water and oxygen
Rust is a general term for a series of iron oxides, usually, red oxides, formed by the reaction of iron with oxygen in the presence of water or air moisture. It is the common term for corrosion of iron and its alloys, such as steel. Both water and oxygen are required to form rust from metal iron.
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MCQ 571 Mark
Consider The Following Sentences And Choose The Correct One:
  • A
    Making sugar solution is a physical change.
  • B
    A physical change is generally reversible.
  • C
    Grinding of wheat grain changes its size, although it is a physical change.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
Here, all the statements are correct. Hence.
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MCQ 581 Mark
In which type of change , we observed alteration only in specific property of matter but not composition?
  • A
    Chemical change
  • ✓
    Physical change operator
  • C
    Both physical and chemical change
  • D
    None of the above
Answer
Correct option: B.
Physical change operator
In a physical change, we observed alteration in specific property of matter but not in composition. Physical change involves only a change in the physical state of matter. Composition and chemical properties remain same.
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MCQ 591 Mark
Which of the following statement is incorrect for a chemical reaction?
  • ✓
    Heat may be given out but never absorbed
  • B
    Sound may be produced
  • C
    A colour change may take place
  • D
    A gas may be evolved
Answer
Correct option: A.
Heat may be given out but never absorbed
Heat can be given out $−$ exothermic reaction.
Heat can also be absorbed $−$ endothermic reaction
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MCQ 601 Mark
Which of the following is not a physical property of a substance?
  • A
    Shape.
  • B
    Color.
  • C
    Density.
  • ✓
    Flammability.
Answer
Correct option: D.
Flammability.
Flammability.
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MCQ 611 Mark
Combustion is a ________________:
  • A
    Physical change
  • ✓
    Chemical change
  • C
    Both $A$ and $B$
  • D
    None of these
Answer
Correct option: B.
Chemical change

We get a new substance in combustion.
The reaction which gives a new substance is a chemical change.

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MCQ 621 Mark
What are the different conditions for a chemical reaction to take place?
  • A
    Close contact
  • B
    Solution form
  • C
    Heat
  • ✓
    All of the above
Answer
Correct option: D.
All of the above
$1.$ Close contact$—$ For a chemical reaction to take place the reactants should be brought in close contact $i.e.$ they should be mixed.
$2.$ Solution form$—$ Some substances react with each other only when they are mixed in the solution form.
$3.$ Heat$—$ Some reactants need to be heated to undergo a chemical change.
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MCQ 631 Mark
Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
  • A
    It is more than $7m$ high.
  • B
    It weighs about $6000\ kg.$
  • C
    It was built more than $1600$ years ago.
  • ✓
    It has not rusted after such a long period.
Answer
Correct option: D.
It has not rusted after such a long period.
It has not rusted after such a long period.
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MCQ 641 Mark
Which is an example of a chemical change?
  • A
    The melting of ice
  • ✓
    The burning of wood
  • C
    The grindig of salt crystals powder
  • D
    The evaporation of water from a sea
Answer
Correct option: B.
The burning of wood
A change in which a new substance is formed is called a chemical change.
Examples of chemical change are digestion of food, ripening of fruit, burning of wood.
The burning of wood is a chemical change because it is always accompanied by the production of heat.
Melting of ice grinding of salt crystals to powder and evaporation of water from the sea are all physical changes because no new substances are formed.
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MCQ 651 Mark
Which of the following is not a physical change?
  • A
    Tearing a paper
  • B
    Bending an iron rod
  • C
    Freezing water into ice
  • ✓
    Curdling of milk
Answer
Correct option: D.
Curdling of milk
The tearing of paper is a physical change because it remains the same. Tearing a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed. And freezing water into ice does not change its chemical constituents. Only phase changes from solid to liquid.
Cheese is made when an enzyme called rennet is added to milk. The rennet causes a chemical reaction where the milk solids curdle, separating themselves from the whey, or liquid portion of the milk
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MCQ 661 Mark
Magnesium hydroxide, obtained when Magnesium oxide is dissolved in water, is:
  • ✓
    Base.
  • B
    An acid.
  • C
    An indicator.
  • D
    A dissolving agent.
Answer
Correct option: A.
Base.
Base.
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MCQ 671 Mark
Which of the following is a feature of physical change?
  • A
    It is reversible
  • B
    It is temporary
  • C
    No new substance is formed
  • ✓
    All of these
Answer
Correct option: D.
All of these
Physical change refers to a change in which the molecules are rearranged but their internal composition remains same. It is Reversible, temporary and no new product formation takes place. Example$-$Tearing of paper, melting/freezing of water, cutting of trees, etc.
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MCQ 681 Mark
Insoluble impurities from solution during crystallization are removed by:
  • A
    Drying
  • ✓
    Filtration
  • C
    Heating
  • D
    Cooling
Answer
Correct option: B.
Filtration
Heating is the process of increasing the temperature of a body from its original temperature.
Cooling is the process of decreasing the temperature of a body from its original temperature.
Filtration is the process of separating small particles of solid matter from a liquid, by causing the liquid to pass through the pores of some substance, called a filter.
Insoluble impurities from solution during crystallization are removed by filtration as the insoluble solid particles passed through the filter.
Drying is the process of drying up the liquid present on any material by heating the material.
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MCQ 691 Mark
Iron rod turns red on heating. What kind of change is this?
  • ✓
    Physical change
  • B
    Periodic change
  • C
    Physical and chemical change
  • D
    Chemical change
Answer
Correct option: A.
Physical change
Physical changes are changes affecting the physical state of a chemical substance, but not its chemical composition. In the case of iron, when iron is heated it will get red colour but there is no change in its chemical form so it is not a chemical change, it is only a physical change.
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MCQ 701 Mark
Which of the following are true when milk changes into curd?
$i.$ Its state is changed from liquid to semi$-$solid.
$ii.$ It changes colour.
$iii.$ It changes taste.
$iv.$ The change cannot be reversed.
Choose the correct option.
  • A
    $(i)$ and $(ii).$
  • B
    $(ii)$ and $(iii).$
  • ✓
    $(i), (iii)$ and $(iv).$
  • D
    $(i)$ to $(iv).$
Answer
Correct option: C.
$(i), (iii)$ and $(iv).$
$(i), (iii)$ and $(iv).$
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MCQ 711 Mark
Which of the following is a chemical change?
  • ✓
    Boiling of eggs
  • B
    Evaporation of water
  • C
    Formation of snow
  • D
    Melting of wax
Answer
Correct option: A.
Boiling of eggs
Chemical changes result in the formation of new substances, and the changes that occur cannot be reversed. The heat from boiling an egg causes the egg's protein to change permanently in texture. It is a chemical change.
Evaporation of water, formation of snow and melting of wax are physical changes, as no new substances are formed.
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MCQ 721 Mark
Choose the most appropriate answer: Physical changes are:
  • A
    Permanent
  • B
    Periodic
  • ✓
    Temporary
  • D
    Irreversible
Answer
Correct option: C.
Temporary
Physical changes are temporary in nature. It does not affect the internal structure of a substance, only the molecules are rearranged. No new substance is formed.
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MCQ 731 Mark
Which of the following are true when milk changes into curd?
$i.$ Its state is changed from liquid to semi$-$solid.
$ii.$ It changes colour.
$iii.$ It changes taste.
$iv.$ The change cannot be reversed.
Choose the correct option.
  • A
    $(i)$ and $(ii).$
  • B
    $(ii)$ and $(iii).$
  • ✓
    $(i), (iii)$ and $(iv).$
  • D
    $(i)$ to $(iv).$
Answer
Correct option: C.
$(i), (iii)$ and $(iv).$
Colour of milk does not change after it convert into curds.
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MCQ 741 Mark
Which of the following is not a chemical change?
  • ✓
    Whipping eggs
  • B
    Burning wood
  • C
    Digestion
  • D
    All of above
Answer
Correct option: A.
Whipping eggs
Simply whipping of eggs does not produce any new substance. Hence, it is a physical change. But digestion and burning of wood result in the formation of new substances. Thus, they are physical changes.
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MCQ 751 Mark
Which of the following is $NOT$ a chemical change$?$
  • A
    Digestion of food
  • ✓
    Precipitation of rain and snow
  • C
    Rusting of iron
  • D
    Burning of paper
Answer
Correct option: B.
Precipitation of rain and snow
Precipitation is any product of the condensation of atmospheric water vapour that falls under gravity. The main forms of precipitation include drizzle, rain, sleet, and snow.
Precipitation occurs when a portion of the atmosphere becomes saturated with water vapour so that the water condenses and "precipitates". Here the water vapour in the air is changing from one form to another.
So precipitation of snow and rain is not a chemical change. In all the other options, a new substance is formed and the main substances cannot be reversed. So, they are chemical changes.
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MCQ 761 Mark
Which of the following is an example of physical change?
  • A
    A bud turning into a flower
  • B
    Rusting of iron
  • ✓
    Boiling of water
  • D
    Ripening of a tomato
Answer
Correct option: C.
Boiling of water
During boiling water forms steam $($water$)$ and thus there is no new substance formation. The chemical composition and properties of the original substance $($water$)$ is not changed. Therefore, boiling of water is a physical change.
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MCQ 771 Mark
Boiling water is a $........$ change because $........:$
  • ✓
    Physical, the gaseous water produced is chemically identical to the liquid water the process began with
  • B
    Physical, the water was disappeared
  • C
    Chemical, heat was required for the change
  • D
    Chemical, the process produced a gas
Answer
Correct option: A.
Physical, the gaseous water produced is chemically identical to the liquid water the process began with
Boiling water is a physical change because the gaseous water produced is chemically identical to the liquid water $i.e.$ both of them have the same molecular structure of the water.
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MCQ 781 Mark
Boojho Is Writing Some Sentences. Choose The Incorrect One And Help Him:
  • A
    Rusting of iron, photosynthesis and digestion of food are examples of chemical change.
  • B
    In order to protect iron from rusting a coating of zinc is deposited on its surface.
  • C
    Some substance cannot be obtained in pure state from their solution by crystallization.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
Here, all the statements are correct. Hence,
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MCQ 791 Mark
Stainless steel can protect iron from rusting as it contains:
  • A
    Tin
  • ✓
    Chromium
  • C
    Zinc
  • D
    Aluminium
Answer
Correct option: B.
Chromium

 Stainless steel can protect the iron from rusting or corrosion as it contains high percentages $(16-36\%)$ of chromium. This element is present in sufficient quantity that when exposed to oxidizing media it forms a thin, tightly adhering, and impervious oxide layer $($predominantly $CrO)$ that stops further corrosion.

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MCQ 801 Mark
When Magnesium ribbon is burnt in candle flame it burns with.
  • A
    Brilliant red light.
  • B
    Brilliant yellow light.
  • ✓
    Brilliant white light.
  • D
    Brilliant Green light.
Answer
Correct option: C.
Brilliant white light.
Brilliant white light.
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MCQ 811 Mark
Which of the following changes is accompanied by sound?
  • A
    Photosynthesis
  • B
    Spoilage of food
  • ✓
    Explosion of fireworks
  • D
    None of these
Answer
Correct option: C.
Explosion of fireworks
Burning of any substance is always accompanied by the production of heat, gas and light. Explosion of fireworks produce heat, light and sound, gas and smoke formed. The cut fruits and vegetables change its colour after some time.
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MCQ 821 Mark
Classify the following as physical or chemical properties. Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
  • ✓
    Chemical
  • B
    Physical
  • C
    Both $A$ and $B$
  • D
    None of these
Answer
Correct option: A.
Chemical

It is a chemical property as electron exchange takes place and new compound forms in this reaction.
$Zn + 2HCl → ZnCl_2​+ H_2$​

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MCQ 831 Mark
Baking of dough into bread is a kind of change:
  • A
    That can be reversed
  • ✓
    That cannot be reversed
  • C
    That can be reversed at every temperature
  • D
    Can't say
Answer
Correct option: B.
That cannot be reversed
It is an irreversible change.
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MCQ 841 Mark
What is the formula of rust?
  • ✓
    $Fe_2O_3$
  • B
    $Fe_3O_4$
  • C
    $FeO$
  • D
    None of these
Answer
Correct option: A.
$Fe_2O_3$
A.  $Fe_2O_3$
Explanation:
Iron metal does not burn in dry air even on strong heating. In moist air iron is slowly oxidised to give rust (iron oxide).
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MCQ 851 Mark
Which of the following is not true for a chemical change?
  • A
    New substances are formed
  • B
    They are irreversible
  • ✓
    Chemical properties of new substance are same
  • D
    Chemical properties of new substance are different
Answer
Correct option: C.
Chemical properties of new substance are same
$1.$ A chemical change is a permanent and not easily reversible.
$2.$ A chemical change results in an alteration in the composition of the molecules of the substance undergoing change and the formation of one or more new substances.
$3.$ The mass of the substance undergoing a chemical change usually changes.
$4.$ Heat is either absorbed or given out during a chemical change.
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MCQ 861 Mark
In Which Of The Following Statements Is Or Are Incorrect?
  • A
    Mixing of metals with other metal or nonmetals in molten from is called alloying.
  • B
    In an endothermic change heat is absorbed.
  • C
    Dissolution of sugar in water is a physical change we get back sugar and water by evaporation.
  • ✓
    Reaction between baking soda and vinegar oxygen is evolved.
Answer
Correct option: D.
Reaction between baking soda and vinegar oxygen is evolved.
Reaction between baking soda and vinegar oxygen is evolved.
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MCQ 871 Mark
Vacuum desiccator is used $........:$
  • ✓
    For drying crystals
  • B
    For purifying crystals
  • C
    For separation of crystals
  • D
    For the process of crystallisation
Answer
Correct option: A.
For drying crystals
Desiccators are an economical and reliable way to assure dry, dust$-$free storage and organization of humidity$-$sensitive products valuable reagents in crystalline form. Proper storage conditions can be optimized by selecting a desiccator size, shape, and control mechanism best suited for the application.
The lower compartment of the desiccator contains lumps of silica gel, anhydrous calcium chloride to absorb water vapor. The substance needing the desiccation is put in the upper compartment, on a glazed perforated ceramic plate. The ground glass rim of the desiccator lid must be greased with a thin layer of vacuum grease.
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MCQ 881 Mark
Take some clean iron nails and place them in the three test tubes prepared as under:
Test tube A: Contains boiled water and a thin layer of oil.
Test tube B: Contains dry air.
Test tune C: Testube half-filled with water.
All the test tubes are tightly closed after placing the nails. After some time what will you observe?
  • A
    Nails placed test tube $A$ rust.
  • B
    Nails placed test tube $B$ rust.
  • ✓
    Nails placed test tube $C$ rust.
  • D
    None of these
Answer
Correct option: C.
Nails placed test tube $C$ rust.

In test tubes $A$ and $B,$ corrosion of nails will not take place.
For corrosion to take place, air (or oxygen), water and iron, three should be in contact.
In test-tube $A,$ a layer of oil separates air from nails and boiled distilled water.
In test-tube $B,$ because the air is dry, hence no moisture is present which can cause rust.
In test-tube $C,$ rusting of nails takes place, as it has all the conditions necessary for rusting i.e. presence of air(oxygen) and moisture.

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MCQ 891 Mark
Growth of plants is a:
  • A
    Physical change
  • ✓
    Chemical change
  • C
    Both $A$ and $B$
  • D
    None of the above
Answer
Correct option: B.
Chemical change

The growth of plants is a chemical change, as its growth can not be reverted. And there are many chemical reactions such as photosynthesis which contribute to the growth of the plant.

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MCQ 901 Mark
Boojho Appeared In Class Test Where He Wrote Some Statements But He Confused To Know The Incorrect Statement. Would You Help Him To Know That?
  • A
    In a chemical change heat, light or both are generally given out or absorbed.
  • B
    Iron utensils when exposed to moist air get gradually coated with reddish brown coating called rust.
  • C
    A process of separating a pure substance in the form of crystals from the hot saturated solution by cooling is called crystallization.
  • ✓
    None of the above
Answer
Correct option: D.
None of the above
None of the above.
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MCQ 911 Mark
Large crystals of pure substances can be formed from their solutions during $........:$
  • ✓
    Crystallization
  • B
    Evaporation
  • C
    Expansion
  • D
    Contraction
Answer
Correct option: A.
Crystallization
Large crystals of pure substances can be formed from their solutions during crystallization.
For example, when hot acidic copper sulfate solution is cooled gradually, the crystals of copper sulfate are obtained.
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MCQ 921 Mark
Burning of wood is a $.........$ change:
  • A
    Reversible
  • B
    Physical
  • ✓
    Irreversible
  • D
    All of these
Answer
Correct option: C.
Irreversible
Answer should be irreversible. When wood is burnt a new substance is formed which cannot be reversed.
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MCQ 931 Mark
Rain formation is a:
  • A
    Chemical change
  • ✓
    Physical change
  • C
    No change takes place
  • D
    Gravitational phenomenon
Answer
Correct option: B.
Physical change
Rain formation is a physical change because it involves only a change in the physical state of water due to change in temperature but chemical properties remain same.
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MCQ 941 Mark
Chemical change are characterised by$..........$
  • ✓
    Formation of new substance
  • B
    Release of energy
  • C
    Absorption of energy
  • D
    Reversible
Answer
Correct option: A.
Formation of new substance
A chemical change is characterized by the formation of a new substance. Because during the formation of a new substance, Chemical composition changes.
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MCQ 951 Mark
A chemical change may involve:
  • A
    Change in colour only.
  • B
    Change in temperature only.
  • C
    Evolution of gas only.
  • ✓
    All of the these.
Answer
Correct option: D.
All of the these.
Chemical reactions may accompany change in colour, evolution of heat and gas etc.
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MCQ 961 Mark
Consider The Following Statements And Choose The Correct Ones:
  • A
    Corrosion of metals causes great economic loss.
  • B
    Corrosion of metals can be prevented if the contact between metal and air is cutoff.
  • C
    A process of giving a thin coating of zinc on Iron sheets to preventing rusting called galvanization.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
All the above.
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MCQ 971 Mark
The process of obtaining Salt by the evaporation of sea water is called.
  • ✓
    Crystallization.
  • B
    Neutralization.
  • C
    Galvanization.
  • D
    Amalgamation.
Answer
Correct option: A.
Crystallization.
Crystallization.
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MCQ 981 Mark
Which of the following statements is not correct?
  • A
    In a chemical change, color of the object may change.
  • ✓
    In a chemical change, heat will always be released.
  • C
    A chemical change always involves a physical change.
  • D
    Rusting of iron becomes faster when humidity is high.
Answer
Correct option: B.
In a chemical change, heat will always be released.
Signs of a chemical reaction include unexpected color change.
When copper reacts with the elements, it turns from its element color of reddish$-$brown to green.
So it is a chemical change.
Heat may or may not be released in a chemical reaction. It depends on the type of reaction.
Chemical changes cause a substance to change into an entire substance with a new chemical formula.
So its shape, size, etc also changes.
For rusting, the presence of both oxygen and water is essential.
The content of moisture in the air is high, which means if it is more humid, rusting becomes faster.
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MCQ 991 Mark
Which one of the following is a physical change?
  • A
    Rusting of iron.
  • B
    Combustion of magnesium ribbon.
  • C
    Burning of candle.
  • ✓
    Melting of wax.
Answer
Correct option: D.
Melting of wax.
Rusting, combustion and burning involve chemical changes.
Melting of wax is a physical change.
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MCQ 1001 Mark
Paheli’s Mother Made A Concentrated Sugar Syrup By Dissolving Sugar In Hot Water. On Cooling, Crystal Of sugar Got Separated. This Indicates A:
  • ✓
    Physical change that can be reversed.
  • B
    Chemical change that can be reversed.
  • C
    Physical change that cannot be reversed.
  • D
    Chemical change that cannot be reversed.
Answer
Correct option: A.
Physical change that can be reversed.
a.   Physical change that can be reversed.
Explanation:
Crystallization is a physical process and can be reversed.
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