The metal that produces $H_{2}$ with both dil. $HCl$ and $NaOH_{(aq)}$ is

Among the statements $(a)-(d)$ the correct ones are
$(a)$ Lithium has the highest hydration enthalpy among the alkali metals.
$(b)$ Lithium chloride is insoluble in pyridine.
$(c)$ Lithium cannot form ethynide upon its reaction with ethyne.
$(d)$ Both lithium and magnesium react slowly with $H_2O$.

When $CO_2$ gas is passed through an aqueous solution of $Na_2CO_3$,what is formed?

When burnt in excess of oxygen,sodium forms a compound $X$ and potassium forms a compound $Y$. The magnetic natures of $X$ and $Y$ respectively are

The $Cs^{+}$ ion imparts a violet color to the flame. This is due to the fact that the emitted radiation has .........

Magnesium liberates $H_2$ gas on reaction with