The electron affinity of an element X is greater than that of element Y.

(a) How is the oxidising power of X likely to compare with that of Y?

(b) How is the electronegativity of X likely to compare with that of Y?

(c) State whether X is likely to be placed to the left or to the right of Y in the periodic table?

Write balanced chemical equations for the following reactions:

(a) Ammonium chloride reacts with calcium hydroxide.

(b) Nitric acid reacts with zinc carbonate.

(c) Concentrated sulphuric acid is added to hydrated copper sulphate.

Write balanced chemical equations for the following:

(a) Laboratory preparation of hydrochloric acid from a less volatile acid.

(b) Bromine gas is passed over ethene in the presence of carbon tetrachloride.

Abhishek was given a salt 'X' which was white in colour for analysis. On strong heating it produced a yellow residue, a colourless gas and also a reddish-brown gas. The solution of the salt ‘X’ when tested with excess of ammonium hydroxide produced a chalky white insoluble precipitate.

(a) Name the coloured gas evolved when Abhishek heated the salt strongly.

(b) Which cation was present in the sample given to Abhishek?

(c) Identify the salt given to Abhishek for analysis.