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Science M.C.Q

Metals and Non-Metals · CBSE STD 10 (CBSE - English Medium). 36 questions.

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36 questions · timed · auto-graded

MCQ 11 Mark
Stainless steel is very useful material for our life. In stainless steel, iron is mixed with:
  • ✓
    Ni and Cr.
  • B
    Cu and Cr.
  • C
    Ni and Cu.
  • D
    Cu and Au.
Answer
Correct option: A.
Ni and Cr.
Stainless steels are formed with the addition of high proportion of chromium and nickel to iron.
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MCQ 21 Mark
Which of the following metals are obtained by electrolysis of their chlorides in molten state?
  1. $\ce{Na}$
  2. $\ce{Ca}$
  3. $\ce{Fe}$
  4. $\ce{Cu}$
  • A
    $1$ and $4$
  • B
    $3$ and $4$
  • C
    $1$ and $3$
  • ✓
    $1$ and $2$
Answer
Correct option: D.
$1$ and $2$
Usually alkali and alkaline earth metals can be extracted by electrolysis of their salts in molten state.
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MCQ 31 Mark
During electrolytic refining of zinc, it gets:
  • ✓
    Deposited on cathode.
  • B
    Deposited on anode.
  • C
    Deposited on cathode as well as anode.
  • D
    Remains in the solution.
Answer
Correct option: A.
Deposited on cathode.

Zinc is positively charged and hence is deposited at negatively charged cathode.

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MCQ 41 Mark
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals $($except Mn and $Mg)?$
  • A
    $H_2SO_4$
  • B
    $HCl$
  • ✓
    $HNO_3$
  • D
    All of these.
Answer
Correct option: C.
$HNO_3$
 $HNO _3$ is a strong oxidising agent. It oxidises metals to metal oxides and then to metal nitrates and itself is reduced to either nitric oxide $( NO )$, nitruos oxide $\left( N _2 O \right)$ or nitrogen dioxide $\left( NO _2\right)$. However, both $Mg$ and $Mn$ evolve hydrogen on reacting with the acid.
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MCQ 51 Mark
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
  • A
    Na
  • B
    Fe
  • C
    Cr
  • ✓
    Hg
Answer
Correct option: D.
Hg

Mercury (Hg) is a liquid at room temperature.

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MCQ 61 Mark
Silver articles become black on prolonged exposure to air. This is due to the formation of:
  • A
    $Ag_3N$
  • B
    $Ag_2O$
  • ✓
    $Ag_2S$
  • D
    $Ag_2S$ and $Ag_3N$
Answer
Correct option: C.
$Ag_2S$

 Air contains traces of hydrogen sulphide $\left( H _2 S\right)$ gas which reacts with silver $( Ag )$ to form $Ag _2 S$ black in colour.

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MCQ 71 Mark
Which of the following property is generally not shown by metals?
  • A
    Electrical conduction.
  • B
    Sonorous in nature.
  • ✓
    Dullness.
  • D
    Ductility.
Answer
Correct option: C.
Dullness.

Metals have shining lustre and they mostly do not show any dullness.

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MCQ 81 Mark
Which one of the following properties is not generally exhibited by ionic compounds?
  • A
    Solubility in water.
  • ✓
    Electrical conductivity in solid state.
  • C
    High melting and boiling points.
  • D
    Electrical conductivity in molten state.
Answer
Correct option: B.
Electrical conductivity in solid state.

Ionic compounds can conduct electricity in molten or aqueous state due to presence of free ions. In solid state, no free or mobile ions are available for conducting electricity.

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MCQ 91 Mark
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
  1. $\ce{Au}$
  2. $\ce{Cu}$
  3. $\ce{Na}$
  4. $\ce{K}$
  • ✓
    $1$ and $2$
  • B
    $1$ and $3$
  • C
    $2$ and $3$
  • D
    $2$ and $4$
Answer
Correct option: A.
$1$ and $2$
Alkali metals are very reactive so cannot refine with the help of electrolytic refining process.
Electrolytic refining is used for metals like $\ce{Cu, Zn, Ag, Au}$ etc. The method to be used for refining an impure metal depends on the nature of the metals well as on the nature of impurities present in it. So, metals $\ce{Au}\ ($gold$)$ and $\ce{Cu}\ ($copper$)$ are refined by electrolytic refining.
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MCQ 101 Mark
Which of the following oxide$(s)$ of iron would be obtained on prolonged reaction of iron with steam?
  • A
    $FeO$
  • B
    $Fe_2O_3$
  • ✓
    $Fe_3O_4$
  • D
    $Fe_2O_3$ and $Fe_3O_4$
Answer
Correct option: C.
$Fe_3O_4$

Following equation shows the reaction between iron and steam.
$3Fe + 4H_2O → Fe_3O_4 + 4H_2$

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MCQ 111 Mark
Which of the following metals exist in their native state in nature?
  1. $\ce{Cu}$
  2. $\ce{Au}$
  3. $\ce{Zn}$
  4. $\ce{Ag}$
  • A
    $1$ and $2$
  • B
    $2$ and $3$
  • ✓
    $2$ and $4$
  • D
    $3$ and $4$
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.
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MCQ 121 Mark
Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?
  • A
    Diamond.
  • ✓
    Graphite.
  • C
    Sulphur.
  • D
    Fullerene.
Answer
Correct option: B.
Graphite.

Graphite is one of the allotropes of carbon which shows layers arrangement of carbon atoms. The fourth valence electron of each carbon is free to move that makes it good conductor of electricity.

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MCQ 131 Mark
An alloy is:
  • A
    An element.
  • B
    A compound.
  • ✓
    A homogeneous mixture.
  • D
    A heterogeneous mixture.
Answer
Correct option: C.
A homogeneous mixture.

A homogeneous mixture of different metals or a metal and a non-metal is called as alloy.

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MCQ 141 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
Correct option: D.
Y is a non-metal and Z is a metal.

Y is sulphur (S) while Z is sodium (Na).

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MCQ 151 Mark
Which of the following non$-$metals is a liquid?
  • A
    Carbon.
  • ✓
    Bromine.
  • C
    Phosphorus.
  • D
    Sulphur.
Answer
Correct option: B.
Bromine.

 Non$-$metal bromine is a liquid but in the molecular form $(Br_2).$

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MCQ 161 Mark
The ability of metals to be drawn into thin wire is known as:
  • ✓
    Ductility.
  • B
    Malleability.
  • C
    Sonorousity.
  • D
    Conductivity.
Answer
Correct option: A.
Ductility.

Ductility can be defined as the property of metals to drawn in thin wires by application of force on them.

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MCQ 171 Mark
Which of the following can undergo a chemical reaction?
  • A
    $MgSO_4 + Fe.$
  • B
    $ZnSO_4 + Fe.$
  • C
    $MgSO_4 + Pb.$
  • ✓
    $CuSO_4 + Fe.$
Answer
Correct option: D.
$CuSO_4 + Fe.$

 Iron is more reactive than copper. Hence, iron displaces copper from copper sulphate solution.

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MCQ 181 Mark
An electrolytic cell consists of :
  1. Positively charged cathode.
  2. Negatively charged anode.
  3. Positively charged anode.
  4. Negatively charged cathode.
  • A
    $1$ and $2$
  • ✓
    $3$ and $4$
  • C
    $1$ and $3$
  • D
    $2$ and $4$
Answer
Correct option: B.
$3$ and $4$
Negative charged particles $($anions$)$ move towards anode; which shows anode is positively charged.
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MCQ 191 Mark
An element A 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
    Mg
  • ✓
    Na
  • C
    P
  • D
    Ca
Answer
Correct option: B.
Na

Sodium (Na) gives all the characteristics of the element X.

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MCQ 201 Mark
If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of:
  • A
    $CuSO_4$
  • ✓
    $CuCO_3$
  • C
    $Cu(NO_3)_2$
  • D
    $CuO$
Answer
Correct option: B.
$CuCO_3$

When kept in open air, Copper reacts with oxygen to form copper oxide which appears as greenish layer.

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MCQ 211 Mark
Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?
  • A
    Sulphur.
  • B
    Oxygen.
  • C
    Nitrogen.
  • ✓
    Iodine.
Answer
Correct option: D.
Iodine.

 Iodine is lustrous.

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MCQ 221 Mark
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
  1. Good thermal conductivity.
  2. Good electrical conductivity.
  3. Ductility.
  4. High melting point.
  • A
    $1$ and $2$
  • B
    $1$ and $3$
  • C
    $2$ and $3$
  • ✓
    $1$ and $4$
Answer
Correct option: D.
$1$ and $4$
Electrical conductivity and ductility have no relevance for a cooking utensil. These properties also do not enhance cooking.
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MCQ 231 Mark
What happens when calcium is treated with water?
  1. It does not react with water.
  2. It reacts violently with water.
  3. It reacts less violently with water.
  4. Bubbles of hydrogen gas formed stick to the surface of calcium.
  • A
    $1$ and $4$
  • B
    $2$ and $3$
  • C
    $1$ and $2$
  • ✓
    $3$ and $4$
Answer
Correct option: D.
$3$ and $4$
Calcium reacts less violently with water producing the bubbles of hydrogen gas along with calcium hydroxide $\ce{(Ca(OH)_2)}.$
$\text{Ca(s)}+2\text{H}_2\text{O(l)}\rightarrow\text{Ca(OH)}_2\text{(aq) + H}_2\text{(g)}\uparrow$
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MCQ 241 Mark
Although metals form basic oxides, which of the following metals form an amphoteric oxide?
  • A
    $Na$
  • B
    $Ca$
  • ✓
    $Al$
  • D
    $Cu$
Answer
Correct option: C.
$Al$

Some of the metals like Aluminium $(Al)$ metal forms amphoteric oxide $(A1_2O_3)$ which can behave like acid as well as base.

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MCQ 251 Mark
Galvanisation is a method of protecting iron from rusting by coating with a thin layer of:
  • A
    Gallium.
  • B
    Aluminium.
  • ✓
    Zinc.
  • D
    Silver.
Answer
Correct option: C.
Zinc.

Applying a layer of zinc through electrolysis is called galvanization.

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MCQ 261 Mark
Electrical wires have a coating of an insulting material. The material, generally used is:
  • A
    Sulphur.
  • B
    Graphite.
  • ✓
    PVC.
  • D
    All can be used.
Answer
Correct option: C.
PVC.

PVC (Poly Vinyl Chloride) coatings are generally used for insulating electrical wires.

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MCQ 271 Mark
Which among the following alloys contain mercury as one of its constituents?
  • A
    Stainless steel.
  • B
    Alnico.
  • C
    Solder.
  • ✓
    Zinc amalgam.
Answer
Correct option: D.
Zinc amalgam.

Alloys of mercury are called amalgam.

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MCQ 281 Mark
Which of the following are not ionic compounds?
  1. $\text{KCl}$
  2. $\text{HCl}$
  3. $CCl_4$
  4. $\text{NaCl}$
  • A
    $1$ and $2$
  • ✓
    $2$ and $3$
  • C
    $3$ and $4$
  • D
    $1$ and $3$
Answer
Correct option: B.
$2$ and $3$

Both $\text{HCl}$ and $CCl_4$ are covalent compounds in nature.

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MCQ 291 Mark
Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non $-$ metal as one of its constituents?
  • A
    Brass.
  • B
    Bronze.
  • C
    Amalgam.
  • ✓
    Steel.
Answer
Correct option: D.
Steel.
  1. Brass $-$ Copper and zinc.
  2. Bronze $-$ Copper and tin.
  3. Amalgam $-$ Mercury with other metals.
  4. Steel $-$ Iron with carbon.
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MCQ 301 Mark
Which among the following statements is incorrect for magnesium metal?
  • A
    It burns in oxygen with a dazzling white flame.
  • ✓
    It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
  • C
    It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.
  • D
    It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.
Answer
Correct option: B.
It reacts with cold water to form magnesium oxide and evolves hydrogen gas.

Magnesium metal does not react with cold water but reacts with both hot water and steam to form magnesium hydroxide and hydrogen gas.

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MCQ 311 Mark
Reaction between X and Y, forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?
  • A
    Has high melting point.
  • ✓
    Has low melting point.
  • C
    Conducts electricity in molten state.
  • D
    Occurs as solid.
Answer
Correct option: B.
Has low melting point.

Z is an ionic compound. Therefore, it is not expected to have low melting point.

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MCQ 321 Mark
The composition of aqua$-$regia is:
 
  • A
    $Dil.HCl : Conc. HNO_3\ 3 : 1$
  • B
    $Conc.HCl : Dil. HNO_3\ 3 : 1$
     
  • ✓
    $Conc.HCl : Conc.HNO_3\ 3 : 1$
     
  • D
    $Dil.HCl : Dil.HNO_3\ 3 : 1$
Answer
Correct option: C.
$Conc.HCl : Conc.HNO_3\ 3 : 1$
 

Aqua$-$regia is a mixture of concentrated $\text{HCl}$ and concentrated $HNO_3$ in $3 : 1$ ratio.

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MCQ 331 Mark
Which one of the following metals do not react with cold as well as hot water?
  • A
    $Na.$
  • B
    $Ca.$
  • C
    $Mg.$
  • ✓
    $Fe.$
Answer
Correct option: D.
$Fe.$
$Na, Ca$ and $Mg$ are reactive metals and quickly react with water. At room temperature, the reaction of Fe is very slow but red hot iron reacts with steam to form $Fe_3O_4$ with hydrogen gas.
$3Fe + 4H_2O \rightarrow Fe_3O_4 + 4H_2$
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MCQ 341 Mark
An alloy is:
  • A
    An element.
  • B
    A compound.
  • ✓
    A homogeneous mixture.
  • D
    A heterogeneous mixture.
Answer
Correct option: C.
A homogeneous mixture.

A homogeneous mixture of different metals or a metal and a non-metal is called as alloy.

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MCQ 351 Mark
$2\ mL$ each of concentrated $\text{HCl, HNO}_3 $and a mixture of concentrated $\text{HCl}$ and concentrated $HNO_3$ in the ratio of $3 : 1$ were taken in test tubes labelled as $A, B$ and $C. A$ small piece of metal was put in each test tube. No change occurred in test tubes $A$ and $B$ but the metal got dissolved in test tube $C$ respectively. The metal could be:
  • A
    $Al$
  • ✓
    $Au$
  • C
    $Cu$
  • D
    $Pt$
Answer
Correct option: B.
$Au$
Gold $($Au$)$ dissolves in aqua regia.
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MCQ 361 Mark
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
  • A
    Mg
  • ✓
    Ag
  • C
    Zn
  • D
    Cu
Answer
Correct option: B.
Ag
Least reactive metal can be displaced from its solution by other three metals. Silver is least reactive out of given four metals.
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