In the reaction of hypobromite with amide, the carbonyl carbon is lost as :

The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO₄ . 5H₂O, respectively, are :

The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :

Match List - I with List - II :

	List - I		List - II
(a)	Mercury	(i)	Vapour phase refining
(b)	Copper	(ii)	Distillation refining
(c)	Silicon	(iii)	Electrolytic refining
(d)	Nickel	(iv)	Zone refining

Choose the most appropriate answer from the option given below :