MCQ 511 Mark
The ability of metals to be drawn into wires is called :
- ✓Ductility
- BMalleability
- CTensile strength
- D$A$ and $C$
Answer
View full question & answer→Correct option: A.
Ductility
Questions · Page 2 of 5
M.C.Q
MCQ 521 Mark
Which of the following oxide $(s)$ of iron would be obtained on prolonged reaction of iron with steam?
- A$\ce{FeO}$
- B$\mathrm{Fe}_2 \mathrm{O}_3$
- ✓$\mathrm{Fe}_3 \mathrm{O}_4$
- D$\mathrm{Fe}_2 \mathrm{O}_3$ and $\mathrm{Fe}_3 \mathrm{O}_4$
Answer
View full question & answer→Correct option: C.
$\mathrm{Fe}_3 \mathrm{O}_4$
Following equation shows the reaction between iron and steam.
$3 \mathrm{Fe}+4 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{Fe}_3 \mathrm{O}_4+4 \mathrm{H}_2$
$3 \mathrm{Fe}+4 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{Fe}_3 \mathrm{O}_4+4 \mathrm{H}_2$
MCQ 531 Mark
A covalent molecule having a double bond between its atoms is :
- AHydrogen.
- ✓Oxygen.
- CWater.
- DAmmonia.
Answer
View full question & answer→Correct option: B.
Oxygen.
In an oxygen molecule, each oxygen atom shares its $2$ electrons to complete its octet and forms double covalent bond between them.
MCQ 541 Mark
A $ ......... $ property is how a substance behaves when it undergoes a physical change, e.g. its density or boiling point.
- ✓Physical
- BChemical
- CMajor
- DPeriodic
Answer
View full question & answer→Correct option: A.
Physical
MCQ 551 Mark
Calamine ore can be converted into zinc oxide by the process of :
- ADehydration.
- BRoasting.
- ✓Calcination.
- DSulphonation.
Answer
View full question & answer→Correct option: C.
Calcination.
Calamine $(\mathrm{ZnCO}_3$, zinc carbonate$)$ is a carbonate ore of zinc. Carbonate ores are converted to metal oxides by calcination $($heating in the absence of air$)$. When calamine ore $($zinc carbonate$)$ is heated in the absence of air, it is converted into zinc oxide.
MCQ 561 Mark
Which of the following metals can be obtained from haematite ore?
- ACopper.
- BSodium.
- CZinc.
- ✓Iron.
Answer
View full question & answer→Correct option: D.
Iron.
Iron can be obtained from hematite ore. Hematite ore contains the compound iron $\ce{(III)}$ oxide $\left(\mathrm{Fe}_2 \mathrm{O}_3\right)$.
MCQ 571 Mark
Electrical wires have a coating of an insulating uctivity material. The material, generally used is :
- ASulphur.
- BGraphite.
- ✓$\ce{PVC}.$
- DAll can be used.
Answer
View full question & answer→Correct option: C.
$\ce{PVC}.$
$\ce{PVC}$ is a polymer and bad conductor of electricity. It is used as insulating material for covering electric wires. Graphite is good conductor of electricity, so cannot be used as insulating material. Sulphur, which is a non-metal although non $-$ conductor of electricity but brittle in nature. So, cannot be used as insulating material.
MCQ 581 Mark
The metal which can be extracted simply by heating the cinnabar ore in air is :
- A$\ce{Zn}$
- B$\ce{Cu}$
- C$\ce{Al}$
- ✓$\ce{Hg}$
Answer
View full question & answer→Correct option: D.
$\ce{Hg}$
Mercury is a low reactive metal. Thus, it can be extracted from its ore cinnabar, $\ce{HgS},$ by heating it in air.
MCQ 591 Mark
Of the three kinds of elements, which is the least conductive?
- AMetal
- BMetalloid
- ✓Non $-$ metal
- D$A$ and $B$
Answer
View full question & answer→Correct option: C.
Non $-$ metal
MCQ 601 Mark
In extraction of copper, the flux used is :
- A$\ce{CaO}$
- ✓$\mathrm{SiO}_2$
- C$\ce{FeO}$
- D$\mathrm{FeSiO}_3$
Answer
View full question & answer→Correct option: B.
$\mathrm{SiO}_2$
MCQ 611 Mark
Which of the following is not the property of non $-$ metals?
- AThey are a bad conductor of electricity.
- BThey are non $-$ sonorous.
- ✓They are ductile.
- DThey are brittle
Answer
View full question & answer→Correct option: C.
They are ductile.
Non $-$ metals are neither ductile nor malleable.
They are a bad conductor of heat and electricity.
Also, they are non $-$ sonorous and are brittle
They are a bad conductor of heat and electricity.
Also, they are non $-$ sonorous and are brittle
MCQ 621 Mark
Rock salt is an ore of one of the following metals. This metal is:
- A$\ce{Mn}$
- ✓$\ce{Na}$
- C$\ce{Fe}$
- D$\ce{Cu}$
Answer
View full question & answer→Correct option: B.
$\ce{Na}$
Rock salt is a chloride ore of sodium. The name of the compound in the ore is sodium chloride with chemical formula $\ce{NaCl}.$
MCQ 631 Mark
The state in which $\ce{NaCl}$ is a bad conductor of electricity is $............ $ and the state in which $\ce{NaCl}$ is a good conductor of electricity is $.............$
- ASolid, vapour
- BVapour, molten
- CMolten, solid
- ✓Solid, molten
Answer
View full question & answer→Correct option: D.
Solid, molten
$\ce{NaCl}$ is a bad conductor of electricity in the solid $-$ state as there are no free ions.
In the molten state, the ions are free to move around and therefore, can conduct electricity.
In the molten state, the ions are free to move around and therefore, can conduct electricity.
MCQ 641 Mark
Food cans are coated with tin and not with zinc because.
- AZinc is costlier than tin.
- BZinc has a higher melting point than tin.
- ✓Zinc is more reactive than tin.
- DZinc is less reactive than tin.
Answer
View full question & answer→Correct option: C.
Zinc is more reactive than tin.
MCQ 651 Mark
A student adds one big iron nail each in four test tubes containing solution of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was added in the solution of :
- AZinc sulphate
- BIron sulphate
- ✓Copper sulphate
- DAluminium sulphate
Answer
View full question & answer→Correct option: C.
Copper sulphate
MCQ 661 Mark
Which one among the following is an acidic oxide?
- A$\mathrm{Na}_2 \mathrm{O}$
- B$\ce{CO}$
- ✓$\mathrm{CO}_2$
- D$\mathrm{Al}_2 \mathrm{O}_3$
Answer
View full question & answer→Correct option: C.
$\mathrm{CO}_2$
MCQ 671 Mark
The rechargeable battery used in a mobile phone hand set is usually :
- ALead ion battery.
- BSodium ion battery.
- CHydrogen ion battery.
- ✓Lithium ion battery.
Answer
View full question & answer→Correct option: D.
Lithium ion battery.
Because lithium ion is a good conductor of electricity.
MCQ 681 Mark
Which of the following reactions not occur?
- A$2\text{AgNO}_3(\text{aq})+\text{Zn(s)}\rightarrow\text{Zn}(\text{NO}_3)_2(\text{aq})+2\text{Ag(s)}$
- B$\text{CuSO}_4(\text{aq})+\text{Zn(s)}\rightarrow\text{ZnSO}_4(\text{aq})+\text{Cu(s)}$
- C$2\text{AgNO}_3(\text{aq})+\text{Fe(s)}\rightarrow\text{Fe}(\text{NO}_3)_2(\text{aq})+2\text{Ag(s)}$
- ✓$\text{CuSO}_4(\text{aq})+2\text{Ag(s)}\rightarrow\text{Cu(s)}+\text{Ag}_2\text{SO}_4(\text{aq})$
Answer
View full question & answer→Correct option: D.
$\text{CuSO}_4(\text{aq})+2\text{Ag(s)}\rightarrow\text{Cu(s)}+\text{Ag}_2\text{SO}_4(\text{aq})$
MCQ 691 Mark
The extraction of metals from their ores and then refining them for use is known as :
- APurification
- BRefining
- CExtraction
- ✓Metallurgy
Answer
View full question & answer→Correct option: D.
Metallurgy
MCQ 701 Mark
An element $E$ reacts with water to form a solution which turns phenolphthalein solution pink.
The element $E$ is most likely to be :
The element $E$ is most likely to be :
- A$\ce{S}$
- ✓$\ce{Ca}$
- C$\ce{C}$
- D$\ce{Ag}$
Answer
View full question & answer→Correct option: B.
$\ce{Ca}$
Calcium is the metal that can react with water to form calcium hydroxide, which is basic in nature. Hence it turns phenolphthalein solution pink.
MCQ 711 Mark
One of the following contains a double bond as well as single bonds. This is :
- A$\mathrm{CO}_2$
- B$\mathrm{O}_2$
- ✓$\mathrm{C}_2 \mathrm{H}_4$
- D$\mathrm{C}_2 \mathrm{H}_2$
Answer
View full question & answer→Correct option: C.
$\mathrm{C}_2 \mathrm{H}_4$
An ethene molecule $(\mathrm{C}_2 \mathrm{H}_4)$ contains one double bond between two carbon atoms and four single bonds between carbon and hydrogen atoms.
MCQ 721 Mark
The elements whose oxides can turn litmus solution blue are :
- ACarbon and sulphur.
- BSodium and carbon.
- ✓Potassium and magnesium.
- DMagnesium and sulphur.
Answer
View full question & answer→Correct option: C.
Potassium and magnesium.
Potassium and magnesium are metals whose oxides are basic in nature. These oxides turn red litmus solution to blue.
MCQ 731 Mark
An element $X$ reacts with hydrogen, when heated, to form a covalent hydride $\mathrm{H}_2 \mathrm{X}$. If $\mathrm{H}_2 \mathrm{X}$ has a smell of rotten eggs, the element $X$ is likely to be :
- ACarbon.
- ✓Sulphur.
- CChlorine.
- DPhosphorus.
Answer
View full question & answer→Correct option: B.
Sulphur.
Because sulphur reacts with hydrogen to form a covalent hydride $,\mathrm{H}_2 \mathrm{S}$ that has the smell of rotten eggs.
MCQ 741 Mark
Which metal is stored in kerosene oil?
- ✓Sodium
- BCalcium
- CIron
- DNone of the above
Answer
View full question & answer→Correct option: A.
Sodium
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open.
Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
MCQ 751 Mark
A common metal which is highly resistant to corrosion is :
- AIron.
- BCopper.
- ✓Aluminium.
- DMagnesium.
Answer
View full question & answer→Correct option: C.
Aluminium.
Aluminium is resistant to corrosion due to the formation of a thin oxide layer $($aluminium oxide or $\mathrm{Al}_2 \mathrm{O}_3). $ This prevents further corrosion by creating a strong protective layer over the surface of the metal.
MCQ 761 Mark
Prevention of corrosion of iron by $\ce{Zn}$ coating is called:
- ✓Galvanization
- BAlloying
- CElectrolysis
- DSoldering
Answer
View full question & answer→Correct option: A.
Galvanization
Galvanization is the process of applying a protective zinc coating to steel or iron.
It prevents iron or steel from corrosion.
It prevents iron or steel from corrosion.
MCQ 771 Mark
The electronic configurations of three elements $X, Y$ and $Z$ are : $X : 2 , Y : 2, 8, 7 , Z : 2, 8, 2$
Which of the following is correct regarding these elements?
Which of the following is correct regarding these elements?
- A$X$ is a metal.
- B$Y$ is a metal.
- C$Z$ is a non $-$ metal.
- ✓$Y$ is a non $-$ metal and $Z$ is a metal.
Answer
View full question & answer→Correct option: D.
$Y$ is a non $-$ metal and $Z$ is a metal.
Element $Y$ has $1$ less electron to complete its octet which is a property of non $-$ metals. On the other hand, element $Z$ has $2$ extra electrons to become stabilised which is a property of metals.
MCQ 781 Mark
Which of the following alloys contains mercury as one of the constituents?
- AStainless steel.
- BSolder.
- CDuralumin.
- ✓Zinc amalgam.
Answer
View full question & answer→Correct option: D.
Zinc amalgam.
Generally, alloys containing mercury as one of its constituents are known as amalgam. Zinc amalgam is an alloy of zinc and liquid mercury.
MCQ 791 Mark
Which of the following metals exist in their native state in nature?
- $\ce{Cu}$
- $\ce{Au}$
- $\ce{Zn}$
- $\ce{Ag}$
- A$1$ and $2$
- B$2$ and $3$
- ✓$2$ and $4$
- D$3$ and $4$
Answer
View full question & answer→Correct option: C.
$2$ and $4$
Gold and silver $(\ce{Au}$ and $\ce{Ag})$ are also known as Noble metals as they are less reactive and exist in their native state in nature.
MCQ 801 Mark
Which of the following pair of metals exists in their native state in nature?
- A$\ce{Ag}$ and $\ce{Hg}.$
- B$\ce{Ag}$ and $\ce{Zn}.$
- C$\ce{Au}$ and $\ce{Hg.}$
- ✓$\ce{Au}$ and $\ce{Ag}.$
Answer
View full question & answer→Correct option: D.
$\ce{Au}$ and $\ce{Ag}.$
Gold $\ce{(Au)}$ and silver $\ce{(Ag)}$ are highly non $-$ reactive.
Hence, they are available in native state in nature and do not react with oxygen or any other element in the atmosphere.
Hence, they are available in native state in nature and do not react with oxygen or any other element in the atmosphere.
MCQ 811 Mark
Unlike non $-$ metals, most metals tend to $........$
- ✓Conduct electricity and heat well.
- BBe gases at room temperature.
- CBreak easily when hammered.
- DHave less luster and shine.
Answer
View full question & answer→Correct option: A.
Conduct electricity and heat well.
MCQ 821 Mark
The elements whose oxides can turn litmus solution red are :
- ALithium and sodium.
- BCopper and potassium.
- CCarbon and hydrogen.
- ✓Phosphorus and sulphur.
Answer
View full question & answer→Correct option: D.
Phosphorus and sulphur.
Phosphorus and sulphur are non $-$ metals whose oxides are acidic in nature.
These oxides turn blue litmus solution to red.
These oxides turn blue litmus solution to red.
MCQ 831 Mark
On the basis of the sequence of the given reactions identify the most and least reactive elements :
$\ce{X + YA \rightarrow XA + Y ...(i) , X + YB \rightarrow XB + Y ...(ii) , Z + XA \rightarrow ZA + X}$
$\ce{X + YA \rightarrow XA + Y ...(i) , X + YB \rightarrow XB + Y ...(ii) , Z + XA \rightarrow ZA + X}$
- A$X$ and $Z$
- B$Y$ and $Z$
- C$Z$ and $X$
- ✓$Z$ and $Y$
Answer
View full question & answer→Correct option: D.
$Z$ and $Y$
MCQ 841 Mark
Which of the following has a triple bond as well as single bonds?
- AEthene.
- BMethane.
- ✓Ethyne.
- DNitrogen.
Answer
View full question & answer→Correct option: C.
Ethyne.
An ethyne molecule $\ce{(H - C ≡ C - H)}$ contains a triple bond between two carbon atoms and two single bonds between carbon and hydrogen atoms.
MCQ 851 Mark
The electronic configurations of three elements $X, Y$ and $Z$ are $X — 2, 8; Y — 2, 8, 7$ and $Z — 2, 8, 2.$ Which of the following is correct?
- A$X$ is a metal.
- B$Y$ is a metal.
- C$Z$ is a non $-$ metal.
- ✓$Y$ is a non $-$ metal and $Z$ is a metal.
Answer
View full question & answer→Correct option: D.
$Y$ is a non $-$ metal and $Z$ is a metal.
$Y$ is sulphur $(S)$ while $Z$ is sodium $\ce{(Na)}$.
MCQ 861 Mark
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide :
- AAn acidic oxide.
- BA basic oxide.
- ✓An amphoteric oxide.
- DA neutral oxide.
Answer
View full question & answer→Correct option: C.
An amphoteric oxide.
Zinc oxide can react with both acids and bases to form salt and water.
MCQ 871 Mark
An element $X$ is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
- A$\ce{Mg}$
- ✓$\ce{Na}$
- C$\ce{P}$
- D$\ce{Ca}$
Answer
View full question & answer→Correct option: B.
$\ce{Na}$
MCQ 881 Mark
Where are metals found on the periodic table?
- ✓On the left
- BIn column $18$
- COn the right
- DAt the bottom
Answer
View full question & answer→Correct option: A.
On the left
MCQ 891 Mark
Non $-$ metals are usually poor conductors of heat and electricity. They are non $-$ lustrous, non $-$ sonorous, non $-$ malleable, and are colored. Non $-$ metal which is required for combustion is $.............$
- ANitrogen
- BChlorine
- ✓Oxygen
- DSulphur
Answer
View full question & answer→Correct option: C.
Oxygen
The non $-$ metal which is required for the combustion is oxygen.
In a combustion reaction, any combustible substance reacts with oxygen gas to form the product.
For example : $\mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$
In a combustion reaction, any combustible substance reacts with oxygen gas to form the product.
For example : $\mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}$
MCQ 901 Mark
A sulphide ore is converted into metal oxide by the process of :
- ACarbonation.
- ✓Roasting.
- CCalcination.
- DAnodising.
Answer
View full question & answer→Correct option: B.
Roasting.
Sulphide ores are transformed into oxides by the process of roasting. In this process, concentrated ore is heated in the presence of surplus air.
Example: Zinc blende $,\ce{ZnS},$ a sulphide ore of zinc, is roasted in the presence of air. On roasting, zinc sulphide gets transformed into zinc oxide.
Example: Zinc blende $,\ce{ZnS},$ a sulphide ore of zinc, is roasted in the presence of air. On roasting, zinc sulphide gets transformed into zinc oxide.
MCQ 911 Mark
The metal which does not react with dilute $\ce{HCl}$ is :
- A$\ce{Al}$
- ✓$\ce{Cu}$
- C$\ce{Zn}$
- D$\ce{Fe}$
Answer
View full question & answer→Correct option: B.
$\ce{Cu}$
MCQ 921 Mark
The major ore of aluminium is known as :
- ACinnabar.
- BCalamine.
- ✓Bauxite.
- DPyrolusite.
Answer
View full question & answer→Correct option: C.
Bauxite.
Bauxite is one of the major ores of aluminium. Its compound is aluminium oxide $\left(\mathrm{Al}_2 \mathrm{O}_3 \cdot 2 \mathrm{H}_2 \mathrm{O}\right)$.
MCQ 931 Mark
The most abundant element in the earth crust is :
- ASilicon.
- ✓Oxygen.
- CIron.
- DAluminium.
Answer
View full question & answer→Correct option: B.
Oxygen.
The most abundant element in the Earth's crust is oxygen, making up $46.6\%$
MCQ 941 Mark
Which one of the following property is generally not exhibited by ionic compounds?
- ASolubility in water.
- ✓Electrical conductivity in solid state.
- CHigh melting and boiling points.
- DElectrical conductivity in molten state.
Answer
View full question & answer→Correct option: B.
Electrical conductivity in solid state.
Because ionic compounds conduct electricity only in molten state or when dissolved in water to form aqueous solution.
MCQ 951 Mark
A $ ........... $ property is how a substance behaves when it undergoes a chemical change, e.g. its flammability or $\ce{pH}$.
- APhysical
- BMajor
- ✓Chemical
- DPeriodic
Answer
View full question & answer→Correct option: C.
Chemical
MCQ 961 Mark
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
- A$\ce{Zn}$
- ✓$\ce{Ag}$
- C$\ce{Cu}$
- D$\ce{Mg}$
Answer
View full question & answer→Correct option: B.
$\ce{Ag}$
$\ce{Ag}$ will be replaced from the solution of its salt by the other three metals.
MCQ 971 Mark
An element $X$ forms two oxides $XO$ and $\mathrm{XO}_2$. The oxide $XO$ is neutral but $\mathrm{XO}_2$ is acidic in nature. The element $X$ is most likely to be :
- ASulphur.
- ✓Carbon.
- CCalcium.
- DHydrogen.
Answer
View full question & answer→Correct option: B.
Carbon.
Carbon forms two oxides $,\ce{CO}$ and $\mathrm{CO}_2$. The oxide $\ce{CO}$ is neutral and $\mathrm{CO}_2$ is acidic in nature.
MCQ 981 Mark
During the formation of ionic bond $ ............ $ transfer takes place from one atom to the others.
- ✓Electron
- BProton
- CNeutron
- DNone of these
Answer
View full question & answer→Correct option: A.
Electron
The compounds formed by the transfer of electrons from a metal to a non $-$ metal are known as ionic compounds or electrovalent compounds.
MCQ 991 Mark
The metals which can produce amphoteric oxides are :
- ASodium and aluminium.
- BZinc and potassium.
- CCalcium and sodium.
- ✓Aluminium and zinc.
Answer
View full question & answer→Correct option: D.
Aluminium and zinc.
Both aluminium and zinc oxides react with acids and bases to form salt and water.
MCQ 1001 Mark
Brass is an alloy of :
- A$Cu $ and $Sn.$
- B$Cu$ and $Pb$.
- C$Pb$ and $Sn.$
- ✓$Zn$ and $Cu.$
Answer
View full question & answer→Correct option: D.
$Zn$ and $Cu.$
Brass is an alloy of copper and zinc. It comprises of $80$ percent copper and $20$ percent zinc.