$CuSO_4$ solution $+$ lime is called

Consider the following statements:
$I$. Atomic hydrogen is obtained by passing an electric arc through hydrogen gas.
$II$. Hydrogen gas does not reduce heated aluminum oxide.
$III$. Finely divided palladium absorbs a large volume of hydrogen gas.
$IV$. Pure nascent hydrogen is obtained by the reaction of $Na$ with $C_2H_5OH$.
Which of the above statements are correct?

Match the following columns:

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

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 $H_2$

Sea divers use a mixture of

List-$I$ contains compounds and List-$II$ contains reactions.

List-$I$	List-$II$
$I$. $H_2O_2$	$P$. $Mg(HCO_3)_2 + Ca(OH)_2 \rightarrow$
$II$. $Mg(OH)_2$	$Q$. $BaO_2 + H_2SO_4 \rightarrow$
$III$. $BaCl_2$	$R$. $Ca(OH)_2 + MgCl_2 \rightarrow$
$IV$. $CaCO_3$	$S$. $BaO_2 + HCl \rightarrow$
	$T$. $Ca(HCO_3)_2 + Ca(OH)_2 \rightarrow$

Match each compound in List-$I$ with its formation reaction$(s)$ in List-$II$,and choose the correct option.