At $T(\mathrm{~K})$, the solubility product of $A X$ is $10^{-10}$. What is the molar solubility of $A X$ in 0.1 MHX ?

The equation that represents 'coal gasification' is

As per standard reduction potential values, which is the strongest reducing agent among the given elements?

A Lewis acid ' $X$ ' reacts with $\mathrm{LiAlH}_4$ in ether medium to give a highly toxic gas. ${ }^{\prime} Y^{\prime}$, ' $Y$ ' when heated with $\mathrm{NH}_3$ gives a compound known as inorganic benzene. ' $Y^{\prime}$ burns in oxygen and gives $\mathrm{H}_2 \mathrm{O}$ and ' $Z$ ', ' $Z$ ' is