The common name of lead (II) sulphide is
1). borax
2). epsom salt
3). galena
4). brimstone
1. The nucleus of an atom consists of
2. Select the one which is not a mixture:
4. Which one of the following is used as a sowing agent in the preparation of soft drinks?
5. Detergents clean surfaces on the principle of
6. The lustre of the metals is because of
7. The metallic constituents of hard water are :
8. What chemical is injected into a person's body when an ant bites?
9. Which one among the following is not a mixture?
10. Earth’s atmosphere is an envelope of gases extending to a height of