CBSE Class 10 Science Metals and Non Metals MCQs Set 11

Multiple Choice Questions (MCQs) for Class 10 Science: Chapter 03 Metals and Nonmetals

Review structured MCQ sets for Class 10 Science Chapter 03 Metals and Nonmetals. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Practice Chapter 03 Metals and Nonmetals MCQs for Class 10 Science

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CBSE Class 10 Science Metals and Non-metals MCQs Set 11 presents 36 solved multiple choice questions covering ductility, sonority, melting points, the action of acids and water on metals, balancing of chemical equations and formulae of ionic compounds. It also has a calculation based on a metal oxide of formula M2O and eight assertion-reason questions with step-by-step reasoning.

Multiple Choice Questions

Question 1: The ability of metals to be drawn into thin wire is known as
(a) ductility
(b) malleability
(c) sonorousity
(d) conductivity
Show Answer & Explanation

Answer: (a) ductility

Explanation:
1. The property of being drawn into thin wires is called ductility.
2. Malleability is the ability to be beaten into thin sheets.

Teacher's Note:
1. Ductile means can be drawn into wires.
2. Gold is the most ductile metal.

Question 2: Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity ?
(a) Diamond
(b) Graphite
(c) Sulphur
(d) Fullerene
Show Answer & Explanation

Answer: (b) Graphite

Explanation:
1. Diamond, sulphur and fullerene do not conduct electricity.
2. Graphite, an allotrope of carbon, has free electrons and conducts electricity, so it is used for electrodes.

Teacher's Note:
1. Graphite is the exception among non-metals.
2. Diamond is hard but a poor conductor.

Question 3: A substance is said to be sonorous if it _________.
(a) conducts heat
(b) conducts electricity
(c) conducts water through metal pipes
(d) produces a ringing sound when beaten
Show Answer & Explanation

Answer: (d) produces a ringing sound when beaten

Explanation:
1. Sonorous materials give a ringing sound when struck with a hard object.
2. Metals are sonorous, which is why school bells are made of metals.

Teacher's Note:
1. Sonorous is linked to sound.
2. Bells, gongs and cymbals use this property.

Question 4: Metals generally are
(a) reducing agents
(b) oxidising agents
(c) both oxidising and reducing agents
(d) None of these
Show Answer & Explanation

Answer: (a) reducing agents

Explanation:
1. Metals lose electrons easily, so they are electropositive.
2. A substance that loses electrons is a reducing agent, so metals are generally reducing agents.

Teacher's Note:
1. Losing electrons means being oxidised and acting as a reducing agent.
2. Non-metals mostly act as oxidising agents.

Question 5: A metal which melts on the palm is
(a) Potassium
(b) Sodium
(c) Gallium
(d) Phosphorous
Show Answer & Explanation

Answer: (c) Gallium

Explanation:
1. Potassium and sodium are soft metals but have melting points well above body temperature.
2. Gallium (and caesium) melt when kept on the palm, and phosphorus is a non-metal.

Teacher's Note:
1. Gallium melts at about 30°C.
2. The question asks for a metal, so phosphorus is out.

Question 6: What happens when calcium is treated with water ?
(i) It does not react with water
(ii) It reacts violently with water
(iii) It reacts less violently with water
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (iii) and (iv)
Show Answer & Explanation

Answer: (d) (iii) and (iv)

Explanation:
1. Calcium reacts with water less violently than sodium: Ca + 2H2O → Ca(OH)2 + H2.
2. The hydrogen bubbles stick to the metal surface and make it float, so (iii) and (iv) are correct.

Teacher's Note:
1. The heat released is not enough to ignite the hydrogen.
2. Floating is caused by sticking bubbles, not by low density.

Question 7: Which one of the following four metals would be displaced from the solution of its salts by other three metals ?
(a) Mg
(b) Ag
(c) Zn
(d) Cu
Show Answer & Explanation

Answer: (b) Ag

Explanation:
1. A metal is displaced by every metal that is more reactive than it.
2. Silver is the least reactive of the four, so Mg, Zn and Cu can all displace it.

Teacher's Note:
1. Arrange the four in order: Mg > Zn > Cu > Ag.
2. The least reactive metal is displaced by all the others.

Question 8: Choose the incorrect pair
(a) NO - Neutral oxide
(b) Cl2O7 - Acidic oxide
(c) MgO - Basic Oxide
(d) P4O10 - Basic oxide
Show Answer & Explanation

Answer: (d) P4O10 - Basic oxide

Explanation:
1. NO is a neutral oxide, Cl2O7 is an oxide of a non-metal and is acidic and MgO is the oxide of a metal, so it is basic.
2. P4O10 is the oxide of the non-metal phosphorus and is acidic, so the pair in (d) is incorrect.

Teacher's Note:
1. Oxides of non-metals are mostly acidic.
2. CO, NO and N2O are neutral oxides.

Question 9: Which represent the correct order of decreasing reactivity?
(a) Mg > Al > Zn > Fe
(b) Mg > Zn > Al > Fe
(c) Al > Zn > Fe > Mg
(d) Mg > Fe > Zn > Al
Show Answer & Explanation

Answer: (a) Mg > Al > Zn > Fe

Explanation:
1. In the activity series, magnesium is above aluminium, aluminium is above zinc and zinc is above iron.
2. So the decreasing order is Mg > Al > Zn > Fe.

Teacher's Note:
1. Learn the series with a mnemonic.
2. Check each option by comparing neighbouring pairs.

Question 10: In each test tubes A, B, C and D, 2 mL of solution of Al2(SO4)3 in water was filled. Clean pieces of zinc was placed in test tube A, clean iron nail was put in test tube B, silver (Ag) was placed in test tube C and a clean copper wire was placed in test tube D. Which of the following option is correct about above experiment?
(a) Zinc is more reactive than aluminium
(b) Copper is more reactive than aluminium
(c) Zinc is less reactive than copper
(d) Zinc, iron, silver and copper are less reactive than aluminium
Show Answer & Explanation

Answer: (d) Zinc, iron, silver and copper are less reactive than aluminium

Explanation:
1. A metal can displace aluminium from Al2(SO4)3 only if it is more reactive than aluminium.
2. Zinc, iron, silver and copper are all below aluminium, so none of them displaces it and no reaction is seen in any tube.

Teacher's Note:
1. Aluminium is higher in the series than all four metals.
2. No reaction means the added metal is less reactive.

Question 11: Identify the pair of metals which reacts with very dilute HNO3 to liberate hydrogen gas ?
(a) Cu, Zn
(b) Cu, Mg
(c) Mg, Mn
(d) Zn, Mn
Show Answer & Explanation

Answer: (c) Mg, Mn

Explanation:
1. Most metals do not give hydrogen with nitric acid because it is a strong oxidising agent.
2. Magnesium and manganese are the exceptions and give hydrogen with very dilute nitric acid.

Teacher's Note:
1. Remember the exception: Mg and Mn.
2. Copper never gives hydrogen with acids.

Question 12: A student writes two incomplete chemical reactions.
X – P4(s) + 5O2(g) →
Y – 2Mg(s) + O2(g) →
Which option completes the reactions to form a balanced chemical equation?
(a) X - P5O4(s); Y - (MgO)2(s)
(b) X - 4PO10(s); Y - 4MgO(s)
(c) X - P4O10(s); Y - 2MgO(s)
(d) X - 5P4O2(s); Y - Mg2O2(s)
Show Answer & Explanation

Answer: (c) X - P4O10(s); Y - 2MgO(s)

Explanation:
1. Four phosphorus atoms and ten oxygen atoms give P4O10.
2. Two magnesium atoms and two oxygen atoms give 2MgO, so option (c) is balanced.

Teacher's Note:
1. Write the correct formulae first, then balance.
2. Magnesium oxide is MgO, not Mg2O2.

Question 13: Cinnabar (HgS) is an ore of mercury. When it is heated in air, it is first converted into mercuric oxide (HgO) and a gas ‘X’ is given out. Mercuric oxide (HgO) is then reduced to mercury on further heating and a gas ‘Y’ is released. Identify the two gases.
(a) X - Sulphur, Y - Oxygen
(b) X - Carbon dioxide, Y - Oxygen
(c) X - Sulphur dioxide, Y - Oxygen
(d) X - Hydrogen, Y - Oxygen
Show Answer & Explanation

Answer: (c) X - Sulphur dioxide, Y - Oxygen

Explanation:
1. Roasting cinnabar in air gives HgO and sulphur dioxide: 2HgS + 3O2 → 2HgO + 2SO2.
2. On further heating HgO decomposes to mercury and oxygen: 2HgO → 2Hg + O2. So X is SO2 and Y is O2.

Teacher's Note:
1. Sulphide ores give SO2 on roasting.
2. Mercury oxide breaks down on heating alone.

Question 14: An element ‘X’ has 2 valence electrons and another element ‘Y’ has 5 valence electrons. Which one of the following correctly represents the formula of the ionic compound formed between X and Y?
(a) X3Y2
(b) X2Y3
(c) X2Y5
(d) XY
Show Answer & Explanation

Answer: (a) X3Y2

Explanation:
1. X loses 2 electrons to form X2+ and Y needs 3 electrons to form Y3−.
2. Balancing the charges (3 ions of X2+ = +6 and 2 ions of Y3− = −6) gives X3Y2.

Teacher's Note:
1. Cross the charges to find the formula.
2. Total positive and negative charge must be equal.

Question 15: The atomic number of an element Y is 16. The number of electrons in Y2− ion will be:
(a) 16
(b) 17
(c) 18
(d) 20
Show Answer & Explanation

Answer: (c) 18

Explanation:
1. A neutral atom of Y has 16 electrons.
2. The ion Y2− has gained 2 electrons, so it has 16 + 2 = 18 electrons.

Teacher's Note:
1. A negative charge means extra electrons.
2. Count the electrons gained.

Question 16: Consider these statements about ionic compounds:
I. They conduct electricity in solid-state
II. They conduct electricity in solutions.
III. They conduct electricity in the molten state.
Choose the correct option.
(a) I only
(b) II only
(c) III only
(d) II and III only
Show Answer & Explanation

Answer: (d) II and III only

Explanation:
1. In the solid state the ions are fixed, so statement I is wrong.
2. In solution and in the molten state the ions are free to move, so II and III are correct.

Teacher's Note:
1. Free ions carry current.
2. Solid ionic compounds are insulators.

Question 17: Transfer of one or more valence electrons from a metal to non-metal takes place in case of
(a) chemical bonding
(b) molecular bonding
(c) ionic bonding
(d) covalent bonding
Show Answer & Explanation

Answer: (c) ionic bonding

Explanation:
1. When a metal gives electrons to a non-metal, positive and negative ions are formed.
2. The attraction between them is called ionic bonding.

Teacher's Note:
1. Transfer gives ionic bond, sharing gives covalent bond.
2. Chemical bonding is a general term.

Question 18: Sodium tungstate has formula Na2WO4, lead phosphate has formula Pb3(PO4)2, the formula for lead tungstate should be:
(a) PbWO4
(b) Pb2(WO4)3
(c) Pb3(WO4)2
(d) Pb3(WO4)4
Show Answer & Explanation

Answer: (a) PbWO4

Explanation:
1. Sodium tungstate shows that the tungstate ion is WO42−.
2. In Pb3(PO4)2 the lead ion is Pb2+, so lead tungstate is PbWO4.

Teacher's Note:
1. Derive each ion’s charge from the given formulae.
2. Equal charges cancel in a 1 : 1 ratio.

Question 19: During electrolytic refining of zinc, it gets
(a) deposited on cathode
(b) deposited on anode
(c) deposited on cathode as well as anode
(d) remains in the solution
Show Answer & Explanation

Answer: (a) deposited on cathode

Explanation:
1. In electrolytic refining the impure metal is the anode and a thin strip of pure metal is the cathode.
2. Zinc ions from the solution gain electrons and are deposited on the cathode as pure zinc.

Teacher's Note:
1. Pure metal always deposits on the cathode.
2. Impure metal dissolves from the anode.

Question 20: The compound from which metal is extracted economically is –
(a) slag
(b) gangue
(c) ore
(d) mineral
Show Answer & Explanation

Answer: (c) ore

Explanation:
1. Minerals are the elements or compounds found naturally in the earth’s crust.
2. A mineral from which the metal can be extracted profitably is called an ore.

Teacher's Note:
1. All ores are minerals, but not all minerals are ores.
2. Gangue is the impurity in the ore.

Question 21: Cinnabar is an ore of which metal?
(a) Hg
(b) Pb
(c) Zn
(d) Cu
Show Answer & Explanation

Answer: (a) Hg

Explanation:
1. Cinnabar is mercuric sulphide, HgS.
2. It is the main ore of mercury.

Teacher's Note:
1. Heating cinnabar in air gives mercury directly.
2. Mercury is low in the reactivity series.

Question 22: The process of electrolysis is used for obtaining such metals which are
(a) highly reactive
(b) moderately reactive
(c) highly unreactive
(d) All types of metals
Show Answer & Explanation

Answer: (a) highly reactive

Explanation:
1. Highly reactive metals cannot be reduced by carbon because they have a greater affinity for oxygen.
2. They are therefore obtained by electrolysis of their molten compounds.

Teacher's Note:
1. Top of the series means electrolysis.
2. Bottom of the series means heating alone.

Question 23: The metal oxide has molecular formula M2O and the molecular mass of metal oxide is given as 94 u. The molecular mass of chloride salt of this given metal is
(a) 118.5 u
(b) 74.5 u
(c) 118.0 u
(d) 120.0 u
Show Answer & Explanation

Answer: (b) 74.5 u

Explanation:
1. For M2O: 2M + 16 = 94, so the atomic mass of M = 39 u (potassium).
2. The chloride is MCl: 39 + 35.5 = 74.5 u.

Teacher's Note:
1. Solve for M first.
2. M2O means the metal is monovalent, so its chloride is MCl.

Question 24: Silver articles become black on prolonged exposure to air. This is due to the formation of
(a) Ag3N
(b) Ag2O
(c) Ag2S
(d) Ag2S and Ag3N
Show Answer & Explanation

Answer: (c) Ag2S

Explanation:
1. Silver reacts slowly with sulphur compounds such as hydrogen sulphide present in air.
2. This forms a black coating of silver sulphide, Ag2S.

Teacher's Note:
1. Tarnished silver is silver sulphide.
2. Copper turns green and iron turns reddish-brown.

Question 25: Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents ?
(a) Brass
(b) Bronze
(c) Amalgam
(d) Steel
Show Answer & Explanation

Answer: (d) Steel

Explanation:
1. Brass is copper and zinc, bronze is copper and tin and amalgam contains mercury, all of which are metals.
2. Steel contains iron and carbon, and carbon is a non-metal.

Teacher's Note:
1. Steel = iron + carbon.
2. Check each alloy’s constituents.

Question 26: The following observations are given for four metals:
I. Metal H does not react with dilute HCl.
II. Metal K reacts with warm water.
III. Metal L does not react with water but displaces metal H from its aqueous salt solution.
IV. Metal M reacts with cold water.
Choose the correct decreasing order of reactivity of these metals amongst the following:
(a) M > L > H > K
(b) K > M > H > L
(c) M > K > L > H
(d) L > H > K > M
Show Answer & Explanation

Answer: (c) M > K > L > H

Explanation:
1. M reacts with cold water, so M is the most reactive, followed by K, which reacts only with warm water.
2. L does not react with water but displaces H, so L is more reactive than H, and H does not react with dilute HCl, so it is the least reactive. The order is M > K > L > H.

Teacher's Note:
1. Order by the mildest conditions needed for reaction.
2. A displacing metal is more reactive than the displaced one.

Question 27: A common metal which is highly resistant to corrosion is:
(a) Iron
(b) Copper
(c) Aluminium
(d) Magnesium
Show Answer & Explanation

Answer: (c) Aluminium

Explanation:
1. Aluminium forms a thin, hard layer of aluminium oxide on its surface.
2. This layer protects the metal from further corrosion.

Teacher's Note:
1. A tight oxide layer protects the metal underneath.
2. Iron’s rust is flaky and falls off.

Question 28: Metals can be given different shapes according to our needs because
(a) they are malleable and ductile
(b) they are sonorous
(c) they are generally hard
(d) they have a shining surface
Show Answer & Explanation

Answer: (a) they are malleable and ductile

Explanation:
1. Malleable metals can be beaten into sheets and ductile metals can be drawn into wires.
2. This lets us shape them as needed.

Teacher's Note:
1. Shapes come from malleability and ductility.
2. Hardness and lustre do not help shaping.

Assertion–Reason Questions

Question 29:
Assertion (A): Sodium metal is obtained by electrolytic reduction.
Reason (R): Sodium is a highly reactive metal.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Highly reactive metals like sodium cannot be reduced by carbon, so they are obtained by electrolysis of their molten chlorides.
2. Therefore both statements are true and R explains A.

Teacher's Note:
1. Top-of-the-series metals need electrolysis.
2. Molten NaCl is electrolysed.

Question 30:
Assertion (A): Different metals have different reactivities with water and dilute acids.
Reason (R): Reactivity of a metal depends on its position in the reactivity series.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Metals high in the reactivity series react vigorously with water and acids, while metals low in the series react little or not at all.
2. So both statements are true and R explains A.

Teacher's Note:
1. Position in the series decides reactivity.
2. K is most reactive, Au least.

Question 31:
Assertion (A): From metals school bells are made.
Reason (R): Metals are sonorous.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Metals produce a ringing sound when struck.
2. This property of being sonorous is why metals are used for bells, so R explains A.

Teacher's Note:
1. Sonorous metals make bells, gongs and cymbals.
2. Non-metals are non-sonorous.

Question 32:
Assertion (A): Carbonate ores are changed into oxides by roasting process.
Reason (R): It is easier to obtain a metal from its oxides.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (d) A is false, but R is true.

Explanation:
1. Carbonate ores are changed into oxides by calcination, not roasting (roasting is for sulphide ores), so A is false.
2. It is easier to obtain a metal from its oxide than from its carbonate or sulphide, so R is true.

Teacher's Note:
1. Calcination: carbonates. Roasting: sulphides.
2. Reduction of oxides is easier.

Question 33:
Assertion (A): Platinum, gold and silver are used to make jewellery.
Reason (R): Platinum, gold and silver are least reactive metals and highly malleable and lustrous.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. These metals are lustrous, malleable and do not corrode easily because they are very unreactive.
2. Hence both statements are true and R explains A.

Teacher's Note:
1. Jewellery metals are shiny and unreactive.
2. They are noble metals.

Question 34:
Assertion (A): Non metals do not displace hydrogen from dilute acids.
Reason (R): Non metals react with hydrogen to form hydrides.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Explanation:
1. Non-metals accept electrons and cannot supply electrons to hydrogen ions, so they do not displace hydrogen from acids and A is true.
2. Non-metals do form hydrides such as NH3 and H2S, so R is true, but it does not explain A.

Teacher's Note:
1. Displacing hydrogen needs electron donors.
2. Non-metals are electron acceptors.

Question 35:
Assertion (A): MgCl2 is a covalent compound.
Reason (R): MgCl2 is a good conductor of electricity in molten state.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (d) A is false, but R is true.

Explanation:
1. MgCl2 is formed by transfer of electrons from magnesium to chlorine, so it is ionic and A is false.
2. Molten ionic compounds contain free ions and conduct electricity, so R is true.

Teacher's Note:
1. Ionic compounds conduct in molten state.
2. Covalent compounds do not conduct.

Question 36:
Assertion (A): Sodium metal reduces chlorine to chloride ion forming sodium chloride.
Reason (R): Sodium metal can lose electrons and act as a reducing agent.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation

Answer: (a) Both A and R are true, and R is the correct explanation of A.

Explanation:
1. Sodium loses one electron, which is gained by chlorine to form the chloride ion, and NaCl is formed.
2. A substance that loses electrons is a reducing agent, so R explains A.

Teacher's Note:
1. Reducing agent = electron donor.
2. Metals are good reducing agents.

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