State which of the following are physical properties of a substance.
1. Chlorine gas has a – strong irritating odour.
2. Sodium nitrate is soluble in water, but calcium carbonate is not.
3. Magnesium reacts with dilute hydrochloric acid, liberating hydrogen gas.
4. Manganese dioxide, a catalyst which alters the rate of a chemical reaction is black in colour.
5. The melting point of ice is 0°C.
6. Lead chloride reacts with barium sulphate to give a white precipitate of lead sulphate.
7. Water acidified with dilute sulphuric acid is a good conductor of electricity.
8. Naphthalene on heating directly turns into vapour.
9. Hydrogen sulphide gas has a strong rotten egg odour.
10. Sulphur is a yellow amorphous powder insoluble in water.
