NCERT Class VIII Science Solutions: Chapter 4-Materials: Metals and Non-Metals Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 7:

Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

  1. Magnesium
  2. Aluminium
  3. Iron
  4. Copper

Answer: D

Question 8:

Which of the following reacts with cold water vigorously?

  1. Carbon
  2. Sodium
  3. Magnesium
  4. Sulphur

Answer: B

Question 9:

The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is

  1. Copper
  2. Iron
  3. Aluminium
  4. Sodium

Answer: C

Question 10:

Which of the following non-metals reacts and catches fire on exposure to air?

  1. Phosphorus
  2. Nitrogen
  3. Sulphur
  4. Hydrogen

Answer: A

Question 11:

Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?

  1. Sulphur dioxide
  2. Magnesium oxide
  3. Iron oxide
  4. Copper oxide

Answer: A

Metal Oxides

Question 12:

Which of the following property is not responsible for copper to be used as electrical conduction wires?

  1. Ductility
  2. Colour
  3. Good conductor of electricity
  4. It is solid

Answer: B