Match the items in Column-$I$ with the relevant item in Column-$II$.
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

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(A-2,4; B-3; C-1,3) $A-2, 4; B-3; C-1, 3$.
$A$. Hydrogen peroxide $(H_2O_2)$ is known as perhydrol (at high concentrations) and is also used as a rocket propellant.
$B$. Calgon method uses sodium hexametaphosphate $(Na_6P_6O_{18})$ to remove hardness.
$C$. Permanent hardness of water is removed by using zeolites (ion exchange method) or sodium hexametaphosphate (Calgon method).

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Match Column-$I$ with Column-$II$ for the given properties/applications mentioned therein.
Column-$I$ Column-$II$
$A$. $H$ $1$. Used in the name of perhydrol.
$B$. $H_2$ $2$. Can be reduced to dihydrogen by $NaH$.
$C$. $H_2O$ $3$. Can be used in hydroformylation of olefin.
$D$. $H_2O_2$ $4$. Can be used in cutting and welding.

$CuSO_4$ solution $+$ lime is called

Match the correct option from Column $-A$ and Column $-B$.
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

Match the terms in Column $-I$ with the relevant item in Column $-II$.
Column $-I$ Column $-II$
$A$. Electrolysis of water produces $1$. atomic reactor
$B$. Lithium aluminium hydride is used as $2$. polar molecule
$C$. Hydrogen chloride is a $3$. recombines on metal surface to generate high temperature
$D$. Heavy water is used in $4$. reducing agent
$E$. Atomic hydrogen $5$. hydrogen and oxygen

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In which of the following reactions,hydrogen is liberated?
$(i)$ $Al_{(s)} + HCl_{(aq)} \rightarrow$
$(ii)$ $Al_{(s)} + NaOH_{(aq)} \rightarrow$
$(iii)$ $NaBH_4 + I_2 \rightarrow$

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