[amp_mcq option1=”less man the vapour pressure over the plane surface” option2=”equal to the vapour pressure over the plane surface” option3=”greater than the vapour pressure over the plane surface” option4=”zero” correct=”option3″]
The correct answer is: C. greater than the vapour pressure over the plane surface.
The vapour pressure of a liquid is the pressure exerted by the vapour in equilibrium with the liquid. The vapour pressure of a liquid depends on the temperature and the surface area of the liquid. The vapour pressure of a liquid is greater at higher temperatures and at larger surface areas.
The vapour pressure over a concave surface is greater than the vapour pressure over a plane surface because the molecules of the liquid are closer to the surface of the liquid at the concave surface. This is because the molecules of the liquid are attracted to the surface of the liquid. The closer the molecules of the liquid are to the surface of the liquid, the greater the vapour pressure of the liquid.
Option A is incorrect because the vapour pressure of a liquid is greater at higher temperatures. Option B is incorrect because the vapour pressure of a liquid is greater at larger surface areas. Option D is incorrect because the vapour pressure of a liquid is not zero.