Question

4. Manganese dioxide, a catalyst which alters the rate of a chemical reaction, is black in colour,
Q.2 State which of the following are
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.
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,​

Answer 1

Answer:

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