Which of the following statements is incorrect?

The incorrect statement regarding the above reactions is:
$Al_{(metal)} \xrightarrow[HCl]{(aq.)} 'X' + \text{Gas } 'P'$
$Al_{(metal)} \xrightarrow[NaOH (aq.)]{+ H_2O} 'Y' + \text{Gas } 'Q'$

The reaction of an element $A$ with water produces a combustible gas $B$ and an aqueous solution of $C.$ When another substance $D$ reacts with this solution $C,$ it also produces the same gas $B.$ $D$ also produces the same gas even on reaction with dilute $H_2SO_4$ at room temperature. Element $A$ imparts a golden yellow color to the Bunsen flame. Then,$A, B, C,$ and $D$ may be identified as:

Identify $A$ to $E$ in the following reactions:
$\underset{\text{Alkali metals}}{\mathop{A}}\,+N_2$ $\xrightarrow{\Delta }B$ $\xrightarrow{H_2O}C+D$
$C+HCl\rightarrow E$
(Where $D$ is $NH_3$ and $E$ is a salt,and $C$ is a base)

Which one of the following alkali metals gives hydrated salts?

How many of the following metals give oxides and nitrides when burnt in air?
$Be, Na, Mg, Ba, Sr, Li, K$