A salt is formed between a bivalent metal cation and an oxyacid of a non-metal. The `-ous` acid of the non-metal has two oxygen atoms per molecule. If the salt contains a radical of per acid of the same non-metal, calculate the number of atoms of various elements present in `0.5` moles of the salt.

Explanation

(i) identification of acidic redical and formula of salt
(ii) determination of the formula of the 'per' acid radical
(iii) determination of the formula of the salt
(iv) determination of the number of atoms of each constituent element, present in one molecule of the salt
(v) determination of the number of atoms of each constituent element, present in 5 moles of the salt
(vi) 4 N oxygen atoms
N chlorine atoms