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Chemistry Practice Questions

NCERT Class X Chapter 3: Metals and Non-metals

Created & Curated By S.K. Sinha

Section A: Questions
Q1.
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
(A) FeO
(B) Fe2O3
(C) Fe3O4
(D) Fe2O3 and Fe3O4
Q2.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
(A) Calcium
(B) Carbon
(C) Silicon
(D) Iron
Q3.
Food cans are coated with tin and not with zinc because:
(A) Zinc is costlier than tin
(B) Zinc has a higher melting point than tin
(C) Zinc is more reactive than tin
(D) Zinc is less reactive than tin
Q4.
You are given a hammer, a battery, a bulb, wires and a switch. (a) How could you use them to distinguish between samples of metals and non-metals? (b) Assess the usefulness of these tests in distinguishing between metals and non-metals. Which property is being tested?
(A) Malleability and electrical conductivity
(B) Ductility and thermal conductivity
(C) Density and lustre
(D) Hardness and magnetic property
Q5.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
(A) Chlorine gas
(B) Hydrogen gas
(C) Oxygen gas
(D) Nitrogen gas
Q6.
The ability of metals to be drawn into thin wires is known as:
(A) Ductility
(B) Malleability
(C) Sonorosity
(D) Conductivity
Q7.
Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?
(A) Sulphur
(B) Oxygen
(C) Nitrogen
(D) Iodine
Q8.
The most reactive metal among the following is:
(A) Sodium
(B) Calcium
(C) Iron
(D) Copper
Q9.
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The solution used by the impostor probably was:
(A) Hydrochloric acid
(B) Nitric acid
(C) Aqua regia
(D) Sodium hydroxide
Q10.
Galvanisation is a method of protecting iron from rusting by coating with a thin layer of:
(A) Gallium
(B) Aluminium
(C) Zinc
(D) Silver
Q11.
Which of the following pairs will give displacement reactions?
(A) NaCl solution and copper metal
(B) MgCl2 solution and aluminium metal
(C) FeSO4 solution and silver metal
(D) AgNO3 solution and copper metal
Q12.
Which of the following methods is suitable for preventing an iron frying pan from rusting?
(A) Applying grease
(B) Applying paint
(C) Applying a coating of zinc
(D) All of the above
Q13.
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
(B) Na
(C) P
(D) Ca
Q14.
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which of the following alloys contain non-metal as one of its constituents?
(A) Brass
(B) Bronze
(C) Amalgam
(D) Steel
Q15.
Which of the following statements about the given reaction are correct?
3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as oxidising agent
(A) (i), (ii) and (iii)
(B) (iii) and (iv)
(C) (i), (ii) and (iv)
(D) (ii) and (iv)
Q16.
The composition of aqua regia is:
(A) Dil. HCl : Conc. HNO3 = 3:1
(B) Conc. HCl : Dil. HNO3 = 3:1
(C) Conc. HCl : Conc. HNO3 = 3:1
(D) Dil. HCl : Dil. HNO3 = 3:1
Q17.
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) H2SO4
(B) HCl
(C) HNO3
(D) All of these
Q18.
The electronic configuration of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7; 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
(D) Y is a non-metal and Z is a metal
Q19.
Metal sulphides occur mainly in rocks and metal halides occur mainly in lakes and sea water. Which of the following statements explains this?
(A) Metal sulphides are insoluble in water whereas metal halides are soluble in water
(B) Metal sulphides are soluble in water whereas metal halides are insoluble in water
(C) Both metal sulphides and metal halides are insoluble in water
(D) Both metal sulphides and metal halides are soluble in water
Q20.
Bauxite ore contains approximately 60% alumina (Al2O3). For extraction of aluminium:
(A) Bauxite is refined to get pure alumina
(B) Cryolite is added to alumina
(C) Electrolysis of molten mixture is carried out
(D) All of the above
Q21.
Copper is found in the free state in nature but not iron. This is because:
(A) Copper is less reactive than iron
(B) Copper is more reactive than iron
(C) Copper is harder than iron
(D) Copper has higher melting point than iron
Q22.
Which of the following are not ionic compounds?
(i) KCl (ii) HCl (iii) CCl4 (iv) NaCl
(A) (i) and (ii)
(B) (ii) and (iii)
(C) (iii) and (iv)
(D) (i) and (iii)
Q23.
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
(A) FeO
(B) Fe2O3
(C) Fe3O4
(D) Fe2O3 and Fe3O4
Q24.
The reason for the exceptional behaviour of nitrogen in Group 15 elements is:
(A) Its small size
(B) High electronegativity
(C) Non-availability of d orbitals
(D) All of the above
Q25.
A metal that exists as a liquid at room temperature is:
(A) Sodium
(B) Mercury
(C) Chromium
(D) Aluminium
Section B: Answers
Question Answer
Q1 (C)
Q2 (A)
Q3 (C)
Q4 (A)
Q5 (B)
Q6 (A)
Q7 (D)
Q8 (A)
Q9 (C)
Q10 (C)
Q11 (D)
Q12 (D)
Q13 (B)
Q14 (D)
Q15 (C)
Q16 (C)
Q17 (C)
Q18 (D)
Q19 (A)
Q20 (D)
Q21 (A)
Q22 (B)
Q23 (C)
Q24 (D)
Q25 (B)
Section C: Solutions
Q1.
Iron reacts with steam at high temperature to form Fe3O4.
Q2.
Calcium oxide has high melting point and is water soluble.
Q3.
Zinc is more reactive, would react with food acids causing harm.
Q4.
Hammer tests malleability; circuit tests electrical conductivity.
Q5.
Metal + Acid → Salt + Hydrogen gas.
Q6.
Ductility is property of being drawn into wires.
Q7.
Iodine is the only lustrous non-metal among given options.
Q8.
Sodium is most reactive in the reactivity series.
Q9.
Aqua regia dissolves gold, reducing weight while cleaning.
Q10.
Galvanization uses zinc coating to prevent rusting.
Q11.
Copper is more reactive than silver, displaces it from AgNO3.
Q12.
All methods prevent oxygen and moisture contact with iron.
Q13.
Sodium is soft, highly reactive with air and water.
Q14.
Steel contains carbon (non-metal) with iron.
Q15.
Fe oxidized (0→+8/3), H₂O reduced (+1→0), H₂O is oxidizing agent.
Q16.
Aqua regia = Conc. HCl : Conc. HNO3 = 3:1.
Q17.
HNO3 is strong oxidizing agent, produces NO instead of H2.
Q18.
Y (2,8,7) = 7 valence electrons (non-metal); Z (2,8,2) = 2 valence electrons (metal).
Q19.
Sulphides are insoluble in water; halides are soluble.
Q20.
All steps are required for aluminum extraction from bauxite.
Q21.
Copper is less reactive, doesn't readily form compounds.
Q22.
HCl and CCl4 are covalent compounds, not ionic.
Q23.
Iron + steam → Fe3O4 (magnetic oxide).
Q24.
Small size, high electronegativity, no d-orbitals make N exceptional.
Q25.
Mercury is liquid at room temperature.

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