Science - Class 8 (C ...

Q58. What happens when iron nails are placed in copper sulphate solution?

 

Q59. Have you ever seen a greenish deposit on the surface of copper vessels? What is that?

Or

Why a greenish deposit is found on copper vessels in rainy season?

Or

Why do copper vessels develop a greenish layer when exposed to moist air?

 

Q60. What happens when dilute sulphuric acid is poured on a copper plate?

 

Q61. State some of the chemical properties of non-metals.

Or

What are the chemical properties of a non-metal?

 

Q62. One day Reeta went to a jeweller’s shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

 

Q63. State some of the physical properties of non-metals.

 

Q64. What are the uses of non-metal?

Or

What is the importance of non-metals?

 

Q65. State some of the chemical properties of metals.

Or

What are the chemical properties of a metal?

 

Q66. Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties.

Properties	Metals	Non-metals
1. Appearance
2. Hardness
3. Malleability
4. Ductility
5. Heat Conduction
6. Conduction of Electricity