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NCERT Class VIII Science Solutions: Chapter 4 - Materials: Metals and Non-Metals Part 2
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?
- Magnesium
- Aluminium
- Iron
- Copper
Answer: D
Question 8:
Which of the following reacts with cold water vigorously?
- Carbon
- Sodium
- Magnesium
- Sulphur
Answer: B
Question 9:
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is
- Copper
- Iron
- Aluminium
- Sodium
Answer: C
Question 10:
Which of the following non-metals reacts and catches fire on exposure to air?
- Phosphorus
- Nitrogen
- Sulphur
- 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?
- Sulphur dioxide
- Magnesium oxide
- Iron oxide
- Copper oxide
Answer: A
Question 12:
Which of the following property is not responsible for copper to be used as electrical conduction wires?
- Ductility
- Colour
- Good conductor of electricity
- It is solid
Answer: B