An organic compound contains: H = 6.32 %, N = 17.76%. In the vapour state, this compound is 39.5 times as heavy as the same volume of hydrogen.

(a) Find the molecular formula of the compound. (At wt: H = 1 N = 14 )

(b) Calculate the number of hydrogen atoms in one mole of this compound.

An element X has atomic number 12. Answer the following questions:

(a) State the period and group to which it belongs.

(b) Write the formula of the compound formed between X and the second member of the halogen group

Distinguish between the following as directed:

(a) Sodium Sulphite and Sodium Sulphate by using dilute HCl.

(b) Ammonium chloride and Sodium chloride by using Calcium hydroxide.

(c) Lead nitrate and silver nitrate by using HCl.

The formulae of some organic compounds are:

A

B

C

D

(a) Write an equation for the preparation of A using B.

(b) Name the compound formed when B and D reacts in presence of a mineral acid.

(c) Write an equation for the preparation of C.