NCERT Solutions of Metals and Non-metals Class 10
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Metals and Non-metals

Solution of NCERT Exemplar Problems

Exemplar Problems - Multiple Choice Questions (Part 5)

Question: 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

  1. Al
  2. Au
  3. Cu
  4. Pt

Answer: (b) Au

Question: 22 - An alloy is

  1. an element
  2. a compound
  3. a homogeneous mixture
  4. a heterogeneous mixture

Answer: (c) A homogeneous mixture

Question: 23 - An electrolytic cell consists of

  1. positively charged cathode
  2. negatively charged anode
  3. positively charged anode
  4. negatively charged cathode
  1. (i) and (ii)
  2. (iii) and (iv)
  3. (i) and (iii)
  4. (ii) ad (iv)

Answer: (b) (iii) and (iv)

Question: 24 - During electrolytic refining of zinc, it gets

  1. deposited on cathode
  2. deposited on anode
  3. deposited on cathode as well as anode
  4. remains in the solution

Answer: (a) Deposited on cathode

Question: 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

  1. Mg
  2. Na
  3. P
  4. Ca

Answer: (b) Na


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NCERT Solutions of Metals and Non-metals Class 10
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