The decomposition of $H_2O_2$ can be prevented by the addition of which of the following?

What will be the input of $A$ and $B$ for the Boolean expression $\overline {(A + B)} \cdot \overline {(A \cdot B)} = 1$?

The locus of the poles of focal chords of the parabola $y^2 = 4ax$ is

The ratio of specific heats of a gas is $\gamma$. The change in internal energy of one mole of the gas,when the volume changes from $V$ to $2 V$ at constant pressure $p$ is

If $S$ and $S^{\prime}$ are the foci of an ellipse,$B$ is one end of the minor axis and $\angle S B S^{\prime} = 90^{\circ}$,then the eccentricity of that ellipse is

........ of a reaction cannot be determined experimentally.