Vapour Pressure — Prelims Questions

Which of the following statements about vapour pressure is INCORRECT?

Which of the following liquids would have the highest vapour pressure at $25^circ\text{C}$?

At a higher altitude, water boils at a lower temperature because:

Consider two liquids, X and Y. At $20^circ\text{C}$, liquid X has a vapour pressure of $100,\text{mmHg}$ and liquid Y has a vapour pressure of $50,\text{mmHg}$. Which liquid is more volatile and why?

If a non-volatile solute is added to a pure solvent, how does it affect the vapour pressure of the solvent at a given temperature?

The Clausius-Clapeyron equation relates vapour pressure to temperature. Qualitatively, what does it imply about the change in vapour pressure with temperature?