On heating pyrolusite with $KOH$ in the presence of air,we get:

Mark the correct statements.

On heating a mixture of common salt and $K_{2}Cr_{2}O_{7}$ with concentrated $H_{2}SO_{4}$,a gas is evolved. The formula of the gas evolved and the oxidation state of the central metal atom in the gas,respectively,are:

The oxoanion in which the oxidation state of the central atom is same as its group number in the periodic table is

$CrO_3$ dissolves in aqueous $NaOH$ to give:

Match the aqueous solutions given in List-$I$ with their colors given in List-$II$:

List-$I$ (Aqueous solution of salt)	List-$II$ (Color)
$A$. $FeSO_4 \cdot 7H_2O$	$i$. Green
$B$. $NiCl_2 \cdot 4H_2O$	$ii$. Pale pink
$C$. $MnCl_2 \cdot 4H_2O$	$iii$. Blue
$D$. $CoCl_2 \cdot 6H_2O$	$iv$. Light green
$E$. $Cu_2Cl_2$	$v$. Pink
	$vi$. Colorless