$NO_2$ is not obtained on heating:

Which of the following reacts with water with the highest rate?

The correct order of electrical conductivity of alkali metal ions in their aqueous solution for $Cs^{+}$, $K^{+}$, $Na^{+}$, and $Li^{+}$ is:

$STATEMENT-1$: 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).

Which one of the alkali metals forms only the normal oxide,$M_2O$,on heating in air?

When magnesium burns in air,the compounds of magnesium formed are magnesium oxide and