Concentrated nitric acid oxidises phosphorus to phosphoric acid according to the following equation:

P + 5HNO₃ ⟶ H₃PO₄ + 5NO₂ + H₂O

(a) What mass of phosphoric acid can be prepared from 3.1 g of phosphorus?

(b) What mass of nitric acid will be consumed at the same time?

Identify the name of the salt on the basis of the following description.

(a) A salt prepared by the action of strong acid on metal.

(b) A nitrate which decomposes into its respective metal on heating.

Arrange the following as per the instruction given in the brackets.

(a) C, Pb, Sn, Ge, Si (increasing order of non-metallic character).

(b) Na, Al, Cl (increasing order of ionisation potential).

(c) Zn²⁺, Na⁺, Cu²⁺(order of preference of discharge at the cathode).

The following questions refer to the periodic table:

(a) What are the elements of group 17 called?

(b) Name the most electronegative element of group 17.

(c) Name the weakest oxidising agent of group 17.