Which metal has a greater tendency to form metal oxide?

Match the following alloys in List-$I$ with their uses in List-$II$:

List-$I$ (Alloy)	List-$II$ (Use)
$A$. $Li-Pb$	$I$. In aircraft construction
$B$. $Be-Cu$	$II$. To make bearings for motor engines
$C$. $Mg-Al$	$III$. To make tetraethyl lead
$D$. $Na-Pb$	$IV$. To make high strength springs

$STATEMENT-1$: Alkali metals dissolve in liquid ammonia to give a blue solution because
$STATEMENT-2$: Alkali metals in liquid ammonia give solvated species of the type $[M(NH_3)_n]^{+}$ ($M=$ alkali metals).

Assertion $(A)$: $K$,$Rb$,and $Cs$ form superoxides.
Reason $(R)$: The stability of the superoxides increases from $K$ to $Cs$ due to the decrease in lattice energy.
The correct answer is:

Which of the following gives a green colour to flame?

Which one of the following on heating will not give $CO_2$?