NCERT Class X Science Class: Chapter – 3. Metals and Nonmetals – Part-4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 20:

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

  1. Mg
  2. Ag
  3. Zn
  4. Cu

Answer: B

Reactivity series

Image the Reactivity Series

Question 21:

each of concentrated and a mixture of concentrated and concentrated in the ratio of 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

Answer: b

Question 22:

An alloy is

  1. An element
  2. A compound
  3. A homogeneous mixture
  4. A heterogeneous mixture

Answer: C

Image Homogeneous Mixture of One or More Metals

Question 23:

An electrolytic cell consists of

  1. Positively charged cathode
  2. Negatively charged anode
  3. Positively charged anode
  4. Negatively charged cathode
  5. (i) and (ii)
  6. (iii) and (iv)
  7. (i) and (iii)
  8. (ii) ad (iv)

Answer: B

+ Anode and - Cathode

Question 24:

During electrolytic refining of copper, 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

Image Electrolytic Refining of Copper

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

Answer: B

Image the Properties of Sodium

Question 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?

  1. Brass
  2. Bronze
  3. Amalgam
  4. Steel

Answer: D