A system is provided 50 J of heat and work done on the system is 10 J. What is change in internal energy ?

At $25\ ^\circ\text{C}$ standard enthalpy of combustion of $\text{H}_2$, Cyclohexene and cyclohexane are -241, -3800 and -3920 kJ $\text{mol}^{-1}$ respectively. What is the heat of hydrogenation of cyclohexene?

Calculate the solubility in mol $\text{dm}^{-3}$ of sparingly soluble salt BA at 293 K if its solubility product is $8.56 \times 10^{-5}$ at same temperature.

Which from following salts does not undergo hydrolysis ?