State the meaning of the term 'oxide. Give a balanced equation for formation of the following oxides -

(a) Sulphur dioxide from a non-metal

(b) Zinc oxide from a metal

(c) Lead oxide from a mixed oxide.

Give two examples each of the following oxides -

(a) Acidic oxides

(b) Basic oxides

(c) Amphoteric oxides

(d) Neutral oxides.

State which of the following oxides i.e. (a) to (d) -

(i) React with water to give a base

(ii) React with a base to give salt & water

(iii) React with acids & bases to give salt & water.

Select the correct answer from A, B, C, D and E for each statement given below:

A: Iron

B: Carbonic acid

C: Hydrogen

D: Oxygen

E: Carbon monoxide

1. The product formed during direct combination reaction of carbon dioxide & water.

2. The neutral gas obtained on thermal decomposition of potassium nitrate.

3. The displaced product of the displacement reaction of sodium with cold water.

4. The catalyst used in the catalytic reaction involving the reactants nitrogen & hydrogen.

5. A neutral oxide which does not react with an acid or a base to give salt & water.

Complete the statements by filling in the blank with the correct word/s:

1. Direct combination reaction of phosphorus pentoxide with water gives …………… [H₃PO₃/H₃PO₄].

2. Decomposition of silver salts in the presence of sunlight is an example of …………… [double decomposition / photochemical decomposition].

3. The element molybdenum used in the reaction of nitrogen with hydrogen at elevated temperatures is an example of a …………… [promoter/catalyst].

4. The reaction of coke with steam to give water gas is an example of an …………… [exothermic/endothermic] reaction.

5. The metal which reacts with steam and the reaction is reversible is …………… [calcium/iron]