The increasing order of solubility in water is:

$A$ solution of sodium in liquid ammonia is blue in color,which is due to the presence of .............

Which of the following is the strongest reducing agent?

State True or False:
$(1)$ Half-life of $^{223}Fr$ is $21 \ s$.
$(2)$ $Li^{+}$ has a high hydration enthalpy and therefore its salts are usually hydrated in nature.
$(3)$ Among all the alkali metals,only $Na$ can react with nitrogen of air and form a nitride.
$(4)$ Except $LiF$,other halides of $Li$ are soluble in water.

The blue colour of the solution (metal dissolved in liquid ammonia) is due to

$NaOH$ is prepared by the method: