Metals and Non-metals MCQ 2
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)
Ans. (b) (iii) and (iv)
Explanation: Negative charged particles (anions) move towards anode; which shows anode is positively charged.
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
Ans. (a) Deposited at cathode
Explanation: Zinc is positively charged and hence is deposited at negatively charged cathode.
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
Ans. (b) Na
Explanation: Sodium is soft and can be cut with knife. It reacts so vigorously with water and air that it is kept in kerosene to prevent reaction.
26. 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
Ans. (d) Steel
Explanation: Steel contains carbon; along with iron.
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
Ans. (a) It burns in oxygen with a dazzling white flame
Explanation: Magnesium does not react with cold water, so option ‘b’ is incorrect. It reacts with hot water to form magnesium oxide, so options ‘c’ and ‘d’ are incorrect.
28. Which among the following alloys contain mercury as one of its constituents?
(a) Stainless steel
(b) Alnico
(c) Solder
(d) Zinc amalgam
Ans. (d) Zinc amalgam
Explanation: Alloys of mercury are called amalgam.
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
Ans. (b) Has low melting point
Explanation: Z is an ionic compound. Ionic compound have high melting point, they occur as solid and conduct electricity in molten state
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
Ans. (d) Y is a non-metal and Z is a metal
Explanation: Y has 7 electrons in its outermost shell. This means Y is electronegative element and hence is a non-metal. Z has 2 electrons in its outermost shell. This means Z is electropositive element and hence is a metal.
31. Although metals form basic oxides, which of the following metals form an amphoteric oxide?
(a) Na
(b) Ca
(c) Al
(d) Cu
Ans. (c) Al
Explanation: Oxide of aluminium shows both acidic and basic behaviour and hence is an amphoteric oxide.
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
Ans. (b) Graphite
33. Electrical wires have a coating of an insulting material. The material, generally used is
(a) Sulphur
(b) Graphite
(c) PVC
(d) All can be used
Ans. (c) PVC
Explanation: Sulphur is highly brittle and hence cannot be used. Graphite is good conductor of electricity and hence it cannot be used for insulation.
34. Which of the following non-metals is a liquid?
(a) Carbon
(b) Bromine
(c) Phosphorus
(d) Sulphur
Ans. (b) Bromine
35. Which of the following can undergo a chemical reaction?
(a) MgSO4 + Fe
(b) ZnSO4 + Fe
(c) MgSO4 + Pb
(d) CuSO4 + Fe
Ans. (d) CuSO4 + Fe
Explanation: Iron is more reactive than copper. Hence, iron displaces copper from copper sulphate solution.
36. Which one of the following figures correctly describes the process of electrolytic refining?
Ans. (b)
Explanation: Copper ions are liberated from positively charged anode and getting deposited on negatively charged cathode.
