NCERT Class X Science Class: Chapter – 3. Metals and Nonmetals – Part-3 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Question 13:

Silver articles become black on prolonged exposure to air. This is due to the formation of

Answer: C

Silver Becoming Black

Question 14:

Galvanization is a method of protecting iron from rusting by coating with a thin layer of

  1. Gallium
  2. Aluminium
  3. Zinc
  4. Silver

Answer: C

Imagerusting by Coating with a Thin Layer of Zinc

Question 15:

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

Answer: A

Image Stainless Steel, Alloy Steel

Question 16:

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

Answer: B

Image Green Coating of Copper Due to CuCO_3

Question 17:

Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

Answer: D

Image the Ordinary vs Nercury

Question 18:

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

  1. (i) and (iv)
  2. (iii) and (iv)
  3. (i) and (iii)
  4. (i) and (ii)

Answer: D

Electrolysis of Chlorides

Question 19:

Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?

  1. Sulphur
  2. Oxygen
  3. Nitrogen
  4. Iodine

Answer: D

Image Nonmetal is Lustrous