Lithium nitrate on heating gives

Identify the correct statements about alkali metals.
$A$. The order of standard reduction potential $(M^{+} \mid M)$ for alkali metal ions is $Na > Rb > Li$.
$B$. $CsI$ is highly soluble in water.
$C$. Lithium carbonate is highly stable to heat.
$D$. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.
$E$. All the alkali metal hydrides are ionic solids.
Choose the correct answer from the options given below.

State the reasons for the following:
$(a)$ Why is a solution of $Na_{2}CO_{3}$ alkaline?
$(b)$ Why are alkali metals prepared by the electrolysis of their fused chlorides?
$(c)$ Why is sodium found to be more useful than potassium in biological systems?

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

List-$I$	List-$II$
$A$. Slaked lime	$I$. $NaOH$
$B$. Dead burnt plaster	$II$. $Ca(OH)_2$
$C$. Caustic soda	$III$. $Na_2CO_3 \cdot 10H_2O$
$D$. Washing soda	$IV$. $CaSO_4$

Choose the correct answer from the options given below:

Which one of the following alkali metals is the weakest reducing agent as per their $E^{\circ}$ values?

On heating,$LiNO_3$ gives how many compounds among the following?
$Li_2O, N_2, O_2, LiNO_2, NO_2$