| Column $-A$ | Column $-B$ |
| $(1).$ Calgon | $(a).$ $D_2O$ |
| $(2).$ Perhydrol | $(b).$ Zeolite |
| $(3).$ Heavy water | $(c).$ Sodium hexametaphosphate |
| $(4).$ Aluminosilicate | $(d).$ Commercial name of Hydrogen peroxide |
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| Column $-A$ | Column $-B$ |
| $(1).$ $H_2O_2$ | $(p).$ As moderator |
| $(2).$ $D_2O$ | $(q).$ As fuel |
| $(3).$ Liquid $H_2$ | $(r).$ For to make hard water soft |
| $(4).$ Zeolite | $(s).$ As disinfectant |
| Column-$I$ | Column-$II$ |
| $A$. Hydrogen peroxide is used as a | $1$. zeolite |
| $B$. Used in Calgon method | $2$. perhydrol |
| $C$. Permanent hardness of hard water is removed by | $3$. sodium hexametaphosphate |
| $4$. propellant |
| Column-$I$ | Column-$II$ |
| $(i)$ Hydrogen peroxide | $(a)$ Used as air purifier in submarines |
| $(ii)$ Calcium sulphate hemihydrate | $(b)$ Used for water softening |
| $(iii)$ Potassium superoxide | $(c)$ Antiseptic |
| $(iv)$ Calgon | $(d)$ Plaster of Paris |
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