Hydrated $\mathrm{CuSO}_4$ from its aqueous solution:
- ADistillation
- BFractional
- ✓Evaporation
- DDecantation
Answer: C.
View full solution →Question types
Is Matter Around Us Pure question types
582 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
582
Questions
9
Question groups
5
Question types
01
M.C.Q. [1 M]
154 Q→02Assertion (A) & Reason (B) MCQ
4 Q→03true or false
6 Q→04Fill in the blank
24 Q→05Do as directed; [1 M ]
160 Q→06Que-Ans (Each of 2 Mark )
126 Q→07Que-Ans (Each of 3 Mark )
53 Q→08Que-Ans (Each of 5 Mark )
42 Q→09Case study ( 4 Marks )
13 Q→Sample Questions
Is Matter Around Us Pure questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following are homogeneous in nature?
$i.$ Ice
$ii.$ Wood
$iii.$ Soil
$iv.$ Air
$i.$ Ice
$ii.$ Wood
$iii.$ Soil
$iv.$ Air
- A$(i)$ and $(iii)$
- B$(ii)$ and $(iii)$
- ✓$(i)$ and $(iv)$
- D$(iii)$ and $(iv)$
Answer: C.
View full solution →The number of phases present in a true solution is:
- ✓$1$
- B$2$
- CDepends on the number of solutes
- DInnumerable
Answer: A.
View full solution →The property/ properties which enable copper metal to be used for making electric wires is / are:
- ACopper metal is malleable and ductile.
- BCopper metal is a good conductor of electricity.
- ✓Copper metal is ductile and has low electrical resistance.
- DCopper metal is sonorous and an excellent conductor of electricity.
Answer: C.
View full solution →The principle behind fractional distillation technique in separation of two liquids is :
- Adifference in melting point
- ✓difference in boiling point
- Cdifference in concentration
- Ddifference in solubility
Answer: B.
View full solution →In the following questions, a statement of Assertion $(A)$ is followed by a statement of Reason $(R)$. Mark the correct choice as:
Assertion: A mixture of acetone and methanol can be separated by fractional distillation.
Reason: The difference between boiling point of acetone and methanol is very less.
Assertion: A mixture of acetone and methanol can be separated by fractional distillation.
Reason: The difference between boiling point of acetone and methanol is very less.
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- ✓If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- DIf Assertion is false and Reason is true.
Answer: B.
View full solution →In the following questions, a statement of Assertion $(A)$ is followed by a statement of Reason $(R)$. Mark the correct choice as:
Assertion: Tyndall effect is an optical property.
Reason: Scattering of beam of light by the colloidal particles is known as Tyndall effect.
Assertion: Tyndall effect is an optical property.
Reason: Scattering of beam of light by the colloidal particles is known as Tyndall effect.
- ✓If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- DIf Assertion is false and Reason is true.
Answer: A.
View full solution →In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Dust particle in air form aerosol.
Reason: Dust particles form dispersion medium and air is dispersed phase.
Assertion: Dust particle in air form aerosol.
Reason: Dust particles form dispersion medium and air is dispersed phase.
- ABoth the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
- ✓The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
- CAssertion is true but the Reason is false.
- DThe statement of the Assertion is false but the Reason is true.
Answer: B.
View full solution →In the following questions, a statement of Assertion $(A)$ is followed by a statement of Reason $(R)$. Mark the correct choice as: If both Assertion and Reason are false.
Assertion: Colloidal particles do not show Tyndall effect.
Reason: Colloidal solutions are stable and the colloidal particles do not settle down.
Assertion: Colloidal particles do not show Tyndall effect.
Reason: Colloidal solutions are stable and the colloidal particles do not settle down.
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- BIf both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
- CIf Assertion is true but Reason is false.
- ✓If Assertion is false and Reason is true.
Answer: D.
View full solution →Gases can be liquified at low temperature and low pressure.
State whether the following statements are true or false:
What type of colloids are bread and sponge?
- Bread is an example of solid foam.
- Sponge is an example of solid sol.
What type of colloids are bread and sponge?Name one pair of liquids which can be separated by using a separating funnel.
State whether the following statement is true or false:
Milk is a pure substance.
Milk is a pure substance.
Sea water is a mixture.
Energy changes occur during ........... change.
Fill in the following blanks with suitable words: The separation of liquids by fractional distillation is based o the difference in their __________.
The process of getting pure solid by cooling hot saturated solution is called ________.
Fill in the following blanks with suitable words:
The gases of air can be separated by fractional distillation of liquid air because they have different ___________.
The gases of air can be separated by fractional distillation of liquid air because they have different ___________.
Fill in the following blanks: Milk is a ________ solution but vinegar is a ________ solution.
Name the source from which nitrogen and oxygen are obtained on a large scale.
Is mixture a pure substance?
Name a metal:
Which has a low melting point.
Which has a low melting point.
Name the technique to separate Camphor from salt.
What are pure substances? Give two examples of pure substances.
What will happen if a saturated solution is: (i) heated, and (ii) cooled?
Define:
- Solute
- Solvent
What are solute and solvent in aerated drinks?
What would you observe when: An aqueous sugar solution is heated to dryness.
Suggest separation technique(s) one would need to employ to separate the following mixtures: Mercury and water.
How will you separate a mixture of sodium chloride and sand?
Which separation techniques will you apply for the separation of the following?
- The different pigments from an extract of flower petals.
- Butter from curd.
- Oil from water.
- Tea leaves from tea.
- Iron pins from sand.
- Wheat grains from husk.
- Fine mud particles floating in water.
What type of mixtures are separated by the technique of crystallisation?
Melting of wax is a physical change but burning of wax is a chemical change. Explain.
The solubility of potassium nitrate at $20^\circ C$ is $32\ g$ per $100\ g$ of water. How much salt is required to prepare $66g$ of its saturated solution?
View full solution →How can you obtain pure water from a salt-water mixture (or salt-solution)? Draw a meat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
Explain how, nitrogen, oxygen and argon gases are separated form air.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separations possible.
How is water purified on a large scale at water works? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply?
There are three substances $X, Y$ and $Z$. The substance $X$ does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance $Y$ is a pure substance which occurs in nature as such. The substance $Y$ has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance $Z$ is also a pure substance whose properties are entirely different from those of its constituents. The substance $Z$ can, however, be divided by electrolysis into two substances which belong to the same class of substances as $Y$.
View full solution →- What type of substance could $X$ be? Name one substance like $X$.
- What type of substance could $Y$ be? Name one substance like $Y$.
- What type of substance could $Z$ be? Name one substance like $Z$.
- Whish process involves absorption or release of an appreciable amount of energy: formation of substance $X$ or formation of substance $Z$?
- Name the three groups into which all the substances like $Y$ are divided on the basis of their properties.
Many indigestion mixtures are suspensions. What do the instructions written on the bottle of an indigestion mixture tell us before taking the mixture, and why?
Three mixtures $A, B$ and $C$ are obtained by stirring three different solids in water taken in separate beakers. When mixture $A$ is allowed to stand for some time, then its particles settle at the bottom of the beaker. When a beam of light is passed through mixture $A$ in a dark room, the path of light becomes visible when observed from the side of the beaker. When mixture $B$ is allowed to stand for a considerable time, even then its particles do not settle down. Mixture $B$, however, scatters the beam of light just like mixture $A$. The particles of mixture $C$ do not settle down on keeping and it also does not scatter a beam of light passing through it.
View full solution →- What are the mixtures like $A$ known as?
- What are the mixtures like $B$ known as?
- What are the mixtures like $C$ known as?
- Name the phenomenon exhibited by $A$ and $B$ which occurs on passing a beam of light through them.
- Name one mixture each which is like $(i) A (ii) B$, and $(iii) C.$
The liquid air has three components $X , Y$ and $Z$ whose boiling points are: $-186^{\circ} C ,-183^{\circ} C$ and $-196^{\circ} C$, respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed up slowly:
a. Which component will be collected from near the bottom of the fraction distillation column? Why?
b. Which component will be collected from the top part of the fractional distillation column? Why?
c. Which component will be collected from the middle part of the fractional distillation column? Why?
d. What could the component $X , Y$ and $Z$ be?
View full solution →a. Which component will be collected from near the bottom of the fraction distillation column? Why?
b. Which component will be collected from the top part of the fractional distillation column? Why?
c. Which component will be collected from the middle part of the fractional distillation column? Why?
d. What could the component $X , Y$ and $Z$ be?
A solid mixture contains four constituents $P, Q, R$ and $S. P$ consists of tiny grains and it is mixed with cement for plastering the walls. $Q$ is a white solid which is recovered on a large scale from sea water by the process of evaporation. $R$ is in the form of tiny particles of a material whose corrosion is called rusting. And $S$ is a white solid which is used in making ordinary dry cells.
View full solution →- What could $P, Q, R$ and $S$ be?
- How would you separate a mixture containing $P, Q, R$ and $S?$
The given mixture contains three constituents $A , B$ and $C$ . The constituent $A$ is a yellow coloured, solid element which dissolves in a liquid $D$. The constituents $B$ is a blue coloured salt which is insoluble in liquid $D$ but dissolves easily in another liquid $E$ . The constitudent $C$ is a liquid wlich is used in coolking food and forms a solid fat on hydrogenation.
a. What do you think could $(i)$ constituent $A$, and $(ii)$ liquid $D$ be?
b. What could $(i)$ constituent $B$, and $(ii)$ liquid $E$ be?
c. What could liquid $C$ be?
d. How will you separate the mixture containing $A , B$ and $C .$
View full solution →a. What do you think could $(i)$ constituent $A$, and $(ii)$ liquid $D$ be?
b. What could $(i)$ constituent $B$, and $(ii)$ liquid $E$ be?
c. What could liquid $C$ be?
d. How will you separate the mixture containing $A , B$ and $C .$
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