Question

Match the items in Column - I with the relevant item in Column - II.
$\begin{array}{cccc}& & & \\ & Column-I& & Column-II\\ \left(a\right)& Hydrogenperoxideisusedasa& \left(p\right)& Zeolite\\ \left(b\right)& UsedinCalgonmethod& \left(q\right)& Perhydrol\\ \left(c\right)& Permanenthardnessofwaterisremovedby& \left(r\right)& Hexametaphosphate\\ & & \left(s\right)& Propellant\end{array}$

• A. (a) $\to$ (q, s); (b) $\to$ (r); (c) $\to$ (p, r)
• B. (a) $\to$ (r); (b) $\to$ (q, s); (c) $\to$ (p, r)
• C. (a) $\to$ (p, r); (b) $\to$ (r); (c) $\to$ (q, s)
• D. (a) $\to$ (q, s); (b) $\to$ (p, r); (c) $\to$ (r)

Answer 1

The correct option is A (a) $\to$ (q, s); (b) $\to$ (r); (c) $\to$ (p, r)

Perhydrol is a solution of hydrogen peroxide $H_2{O}_2$ 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 $(NaP{O}_3{)}_6$.
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.