What is the pH of 0.02 M NaOH solution?

Which of the following compounds has lower boiling point?

A gas is allowed to expand in an insulated container against a constant external pressure of 2.5 atm from $$2.5 \mathrm{~L}$$ to $$4.5 \mathrm{~L}$$, the change in internal energy of the gas in joules is

Which of the following solutions shows positive deviation from Raoult's law?