The electronic configuration of a metal $M$ is $1s^2 \, 2s^2 \, 2p^6 \, 3s^1$. What will be the formula of its oxide?

The ether that undergoes electrophilic substitution reactions is

Which of the following reactions is $NOT$ associated with the Solvay process for the manufacture of sodium carbonate?

$A$ transformer works on the principle of

Two blocks of masses $1 \ kg$ and $2 \ kg$ are connected by a metal wire going over a smooth pulley. The breaking stress of the metal is $\frac{40}{3 \pi} \times 10^6 \ N m^{-2}$. What should be the minimum radius of the wire used if it should not break (in $mm$)? $\left(g = 10 \ m s^{-2}\right)$

Among the following compounds,which one is not responsible for the depletion of the ozone layer?