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Metals and Non- Metals : NCERT Exemplar


                 CLICK HERE to watch second part

 

Multiple Choice Questions : 

Q.1 Which of the following property is generally not shown by metals?

(a) Electrical conduction

(b) Sonorous in nature

(c) Dullness

(d) Ductility

Sol. (c) 


Q.2 The ability of metals to be drawn into thin wire is known as

(a) Ductility

(b) Malleability

(c) Sonorousity

(d) Conductivity

Sol. (a)


Q.3 Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (i) and (iv)

Sol. (d) 


Q.4 Which one of the following metals does not react with cold as well as hot water?

(a) Na

(b) Ca

(c) Mg

(d) Fe

Sol. (d) 


Q.5 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

Sol. (c) 


Q.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)

Sol. (d) 


Q.7 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

Sol. (c) 


Q.8 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

Sol. (c) 


Q.9 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)

Sol. (b) 


Q.10 Which one of the following properties is not generally exhibited by ionic compounds?

(a) Solubility in water

(b) Electrical conductivity in solid state

(c) High melting and boiling points

(d) Electrical conductivity in molten state

Sol. (b) 


Q.11 Which of the following metals exist in their native state in nature?

(i) Cu

(ii) Au

(iii) Zn

(iv) Ag

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (ii) and (iv)

(d) (iii) and (iv)

Sol. (a) 


Q.12 Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) Au

(ii) Cu

(iii) Na

(iv) K

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (iii) and (iv)

Sol. (d) 


Q.13 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

Sol. (c) 


Q.14 Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

(a) Gallium

(b) Aluminium

(c) Zinc

(d) Silver

Sol. (c) 


Q.15 Stainless steel is very useful material for our life. In stainless steel, iron is mixed with

(a) Ni and Cr

(b) Cu and Cr

(c) Ni and Cu

(d) Cu and Au

Sol. (a) 


Q.16 If copper is kept in open air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

(a) CuSO4

(b) CuCO3

(c) Cu(NO3)2

(d) CuO

Sol. (d) 


Q.17 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

(d) Hg

Sol. (d) 


Q.18 Which of the following metals are obtained by electrolysis of their chlorides in molten state?

(i) Na

(ii) Ca

(iii) Fe

(iv) Cu

(a) (i) and (iv)

(b) (iii) and (iv)

(c) (i) and (iii)

(d) (i) and (ii)

Sol. (d) 


Q.19 Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?

(a) Sulphur

(b) Oxygen

(c) Nitrogen

(d) Iodine

Sol. (d) 


Q.20 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

Sol. (b) 


Q.21 2 ml each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 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

(b) Au

(c) Cu

(d) Pt

Sol. (b) 


Q.22 An alloy is

(a) an element

(b) a compound

(c) a homogeneous mixture

(d) a heterogeneous mixture

Sol. (c) 


Q.23 An electrolytic cell consists of

(i) positively charged cathode

(ii) negatively charged anode

(iii) positively charged anode

(iv) negatively charged cathode

(a) (i) and (ii)

(b) (iii) and (iv)

(c) (i) and (iii)

(d) (ii) ad (iv)

Sol. (b) 


Q.24 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

Sol. (a) 


Q.25 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

Sol. (b) 


Q.26 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

(d) Steel

Sol. (d) 


Q.27 Which among the following statements is incorrect for magnesium metal?

(a) It burns in oxygen with a dazzling white flame

(b) 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

Sol. (b) 


Q.28 Which among the following alloys contain mercury as one of its constituents?

(a) Stainless steel

(b) Alnico

(c) Solder

(d) Zinc amalgam

Sol. (d) 


Q.29 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

(b) Has low melting point

(c) Conducts electricity in molten state

(d) Occurs as solid

Sol. (b) 


Q.30 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

(d) Y is a non-metal and Z is a metal

Sol. (d) 


Q.31 Although metals form basic oxides, which of the following metals form an amphoteric oxide?

(a) Na

(b) Ca

(c) Al

(d) Cu

Sol. (c) 


Q.32 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

Sol. (b) 


Q.33 Electrical wires have a coating of an insulating material. The material, generally used is

(a) Sulphur

(b) Graphite

(c) PVC

(d) All can be used

Sol. (c)


Q.34 Which of the following non-metals is a liquid?

(a) Carbon

(b) Bromine

(c) Phosphorus

(d) Sulphur

Sol. (b) 


Q.35 Which of the following can undergo a chemical reaction?

(a) MgSO4 + Fe

(b) ZnSO4 + Fe

(c) MgSO4 + Pb

(d) CuSO4 + Fe

Sol. (d) 


Q.36 Which one of the following figures correctly describes the process of electrolytic refining?

Sol. (c)



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