(i) Define/ State:
(a) Electronegativity
(b) Gay-Lussac's Law of combining volumes

(ii) The Empirical formula of an organic compound is CHCl₂.
If its relative molecular mass is 168, what is its molecular formula?
[At. Wt. C= 12, H = 1, Cl = 35.5]

(iii) Choose the substances given in the box below to answer the following questions:

(a) The metal that will not produce hydrogen gas when reacted with dilute acids.
(b)The compound that will produce sulphur dioxide gas when reacted with dilute HCl.
(c) The solution of this compound produces dirty green precipitate with NaOH.

(iv) State one relevant observation for each of the following:
(a) To the copper nitrate solution, initially few drops of sodium hydroxide solution is added and then added in excess.
(b) Burning of ammonia in excess of oxygen.
(c) Dry ammonia gas is passed over heated PbO.

Solution

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