question_answer 1)

  Match the items in Column I with the relevant items in Column II.

Column I	Column II
(i) Hydrogen peroxide is used as a	(a) Zeolite
(ii) Used in calgon method	(b) Perhydrol
(iii) Permanent hardness of hard water is removed by	(c) Sodium hexametaphosphate
	(d) Propellant

Answer:

  (i-b, d) (ii-c) (iii-a, c)