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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When oxalic acid reacts with conc. $H_2SO_4$,two gases produced are of neutral and acidic in nature respectively. Potassium hydroxide absorbs one of the two gases. The product formed during this absorption and the gas which gets absorbed are respectively

Correlate the items listed in Column $I$ with those listed in Column $II$. Find out as many correlations as you can.
Column $I$ Column $II$
$A$. Synthesis gas $1$. $Na_2[Na_4(PO_3)_6]$
$B$. Dihydrogen $2$. Oxidising agent
$C$. Heavy water $3$. Softening of water
$D$. Calgon $4$. Reducing agent
$E$. Hydrogen peroxide $5$. Stoichiometric compounds of $s-$block elements
$F$. Salt like hydrides $6$. Prolonged electrolysis of water
$7$. $Zn + NaOH$
$8$. $Zn + dil. H_2SO_4$
$9$. Synthesis of methanol
$10$. Mixture of $CO$ and $H_2$

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Oxalic acid reacts with concentrated $H_2SO_4$ to produce a mixture of two gases. When this mixture is passed through caustic potash,one of the gases is absorbed. Which substance is formed by the absorption of the gas in caustic potash?

$H_2C_2O_4 \xrightarrow{\Delta } \text{gas } (A) + \text{gas } (B) + \text{liquid } (C)$.
$\text{Gas } (A) \text{ burns with a blue flame and is oxidised to gas } (B)$.
$\text{Gas } (A) + Cl_2 \to (D) \xrightarrow{NH_3, \Delta } (E)$.
$A, B, C \text{ and } E \text{ are}$

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

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