Which of the following is not a protonic acid?

Which of the following statements is/are incorrect?

The work of $146 \, kJ$ is performed in order to compress one kilo mole of a gas adiabatically,and in this process,the temperature of the gas increases by $7 \, ^oC$. The gas is $(R = 8.3 \, J \, mol^{-1} \, K^{-1})$.

The set $\{x \in R: \cos 2x + 2 \cos^2 x = 2\}$ is equal to

Which of the following aqueous solutions has the highest boiling point?

The mass defect in a particular nuclear reaction is $0.3 ~g$. The amount of energy liberated in kilowatt hour is: (Velocity of light $= 3 \times 10^8 ~m/s$)