Which pair of metals dissolves in $NaOH$ solution?

Match the elements given in Column-$I$ with the colour they impart to the flame given in Column-$II$.

Column-$I$	Column-$II$
$A$. $Cs$	$1$. Apple green
$B$. $Na$	$2$. Violet
$C$. $K$	$3$. Brick red
$D$. $Ca$	$4$. Yellow
$E$. $Sr$	$5$. Crimson red
$F$. $Ba$	$6$. Blue

Which factor makes $Li$ the strongest reducing agent in aqueous solution?

Match the following:

Compound	Molecular formula
$1$. Lime stone	$a$. $CaO$
$2$. Quick lime	$b$. $NaHCO_3$
$3$. Washing soda	$c$. $CaCO_3$
$4$. Baking soda	$d$. $Na_2CO_3 \cdot 10H_2O$

$A$ metal $M$ reacts with nitrogen gas to afford $M_3N$. $M_3N$ on heating at high temperature gives back $M$ and on reaction with water produces a gas $B$. Gas $B$ reacts with aqueous solution of $CuSO_4$ to form a deep blue compound. $M$ and $B$ respectively are

Select the incorrect statement.