When a metal is burnt in air,the resulting ash,upon moistening,gives the smell of $NH_3$. Which metal is it?

Identify the option in which the trends corresponding to hydroxides of group $2$ elements (from $Mg(OH)_2$ to $Ba(OH)_2$) are correctly shown:

Basic character

Chemical stability

Solubility

Bleaching powder is obtained by passing chlorine on

Which one of the alkaline earth metal carbonates is thermally the most stable?

Which ion is typically formed by alkaline earth metals?

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$a$. $Be$	$i$. Treatment of cancer
$b$. $Mg$	$ii$. Extraction of metals
$c$. $Ca$	$iii$. Incendiary bombs and signals
$d$. $Ra$	$iv$. Windows of $X$-ray tubes
	$v$. Bearings for motor engines

Choose the most appropriate answer from the options given below: