$A$ fire of lithium,sodium,and potassium can be extinguished by

Why is $Li_{2}CO_{3}$ decomposed at a lower temperature whereas $Na_{2}CO_{3}$ at a higher temperature?

Which of the following metals displaces $SO_2$ gas from concentrated sulphuric acid?

The elements of group $IA$ provide a colour to the flame of a Bunsen burner due to

$A$ metal $M$ on heating in nitrogen gas gives $Y$. $Y$ on treatment with $H_2O$ gives a colourless gas which when passed through $CuSO_4$ solution gives a blue colour. $Y$ is

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