NCERT Class X Science Class: Chapter – 2. Acids, Bases and Salts – Part-4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 20:

In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (Figure) was set up. Which among the following statements is/are correct?

  1. Bulb will not glow because electrolyte is not acidic
  2. Bulb will glow because is a strong base and furnishes ions for conduction.
  3. Bulb will not glow because circuit is incomplete
  4. Bulb will not glow because it depends upon the type of electrolytic solution
Image Electrical Experment
  1. (i) and (iii)
  2. (ii) and (iv)
  3. (ii) only
  4. (iv) only

Answer: C

No Glow when Circuit Not Complete

Question 21:

Which of the following is used for dissolution of gold?

  1. Hydrochloric acid
  2. Sulphuric acid
  3. Nitric acid
  4. Aqua regia

Answer: D

Image the Aqua Regia

Question 22:

Which of the following is not a mineral acid?

  1. Hydrochloric acid
  2. Citric acid
  3. Sulphuric acid
  4. Acetic acid

Answer: B

Image the Mineral Acid

Question 23:

Which among the following is not a base?

Answer: D

Question 24:

Which of the following statements is not correct?

  1. All metal carbonates react with acid to give a salt, water and carbon dioxide
  2. All metal oxides react with water to give salt and acid
  3. Some metals react with acids to give salt and hydrogen
  4. Some non-metal oxides react with water to form an acid

Answer: B