Which of the following is the structure of an alcohol with molecular formula $\mathrm{C}_5 \mathrm{H}_{12} \mathrm{O}$ ?

Four vessels of same volume consist equal masses of four gases $\mathrm{H}_2, \mathrm{Cl}_2, \mathrm{~N}_2$, and $\mathrm{O}_2$ separately at same temperature. The pressure exerted by the gas is maximum for

The solubility product of a sparingly soluble salt AX is $4.9 \times 10^{-13}$. What is its solubility in $\mathrm{mol} \mathrm{dm}^{-3}$ ?

Which from following cations develops lowest value of spin only magnetic moment?