Question

Statement 1 : Water boils at a higher temperature on the moon.
Statement 2 : The atmospheric pressure of the moon is less than that on earth.
A. Both statement $1$ and statement $2$ are correct and statement $2$ is the correct explanation of statement $2$
B. Both statement $1$ and statement $2$ are correct but statement $2$ is NOT the correct explanation of statement $1$
C. Statement $1$ is correct but statement $2$ is not correct.
D. Statement $1$ is not correct, but Statement $2$ is correct.

Answer 1

As we know that the boiling point depends on the atmospheric pressure . Water boils only when the atmospheric pressure becomes equal to the vapour pressure of the liquid. Boiling point is defined as the point in which the atmospheric pressure becomes the same as that of the vapour pressure exerted by the liquid.

Complete step by step solution:
As we know that the moon does not have its atmosphere . So there is no atmospheric pressure in the moon. So it is clear that the atmospheric pressure of the moon is less than that of the earth. So the statement $2$ is correct. The temperature of the moon varies from ${120^ \circ }C$ to $- {130^ \circ }C$. The moon’s poles are even colder . As there is no atmosphere on the moon as on earth, so water will boil instantly . So the statement $1$ is wrong.
From the above explanation it is clear to us that the correct answer of the question is option:
D. Statement $1$ is not correct, but statement $2$ is correct.

So the correct answer is option B

Additional information:
the radius of the earth is four times greater than that of the moon’s radius. The mass of earth is eighty one times the mass of the moon’s mass. There is no atmosphere in the moon as we have on earth.

Note: Always remember that boiling point of a liquid depends on the outside pressure. When the vapour pressure of the liquid is equal to or greater than the atmospheric pressure it starts boiling. The moon does not have an atmosphere , for this reason the water starts to boil instantly, because the vapour pressure of the liquid is already greater than the atmospheric pressure of the moon.