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Question

Match the items in Column - I with the relevant item in Column - II.
Column−I Column−II(a)Hydrogen peroxide is used as a(p)Zeolite(b)Used in Calgon method(q)Perhydrol(c)Permanent hardness of water is removed by(r)Hexametaphosphate (s)Propellant

A
(a) (q, s); (b) (r); (c) (p, r)
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B
(a) (r); (b) (q, s); (c) (p, r)
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C
(a) (p, r); (b) (r); (c) (q, s)
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D
(a) (q, s); (b) (p, r); (c) (r)
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Solution

The correct option is A (a) (q, s); (b) (r); (c) (p, r)
Perhydrol is a solution of hydrogen peroxide H2O2 at a concentration
of 30% of weight by volume(w/v) or 100 volume strength. It is used as a rocket propellant.

Strictly speaking, sodium hexametaphosphate is a hexamer of composition (NaPO3)6.
It is sold by the name Calgon - S and is used in water treatment to treat/soften permanently hard water.
The actual composition of Calgon is a mixture of polymeric metaphosphates, only one of which is the above hexamer.
It is more correctly termed sodium polymetaphosphate.
Zeolite is particularly effective in removing/treating permanent hardness of water.

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