(a) State whether the following statements are True or False. Justify your answer.

1. Weak acids have low electrical conductivity.
2. The concentration of hydrogen ions is equal in strong acids and weak acids.

(b) Calculate the percentage of sodium (Na) in Na₂B₄O₇.10H₂O.

An organic compound, whose vapour density is 45, has the following percentage composition

H = 2.22%, O = 71.19% and remaining carbon.

Calculate,

(a) it's empirical formula, and

(b) it's molecular formula

State your observations during the process of electrolysis of given compounds.

(a) Fused lead bromide using graphite electrodes.

(b) Copper sulphate solution using copper electrodes.

(c) Acidified water using platinum electrodes.

Choose the most appropriate answer from the following list of substances which fits best in the description.

[Silver chloride, ammonium chloride, aqua-regia, explosive, N₂ , NCl₃, volatile]

(a) Silver nitrate reacts with hydrochloric acid to give a white precipitate.

(b) The solution formed by the concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1.

(c) The property which does not allow conc. HNO₃ used in the preparation of HCl.