In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

a)      Increasing pressure on hydrogen contained in a closed container.

b)     Some hydrogen gas leaking out of the container.

c)      Increasing the volume of the container of hydrogen gas.

d)     Adding more hydrogen gas to the container without increasing the volume of the container.

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a and b

a and d

b and c

b and d

answer is C.

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Detailed Solution

The distance between the molecules of hydrogen gas would increase when some hydrogen gas leaks out of the container or by increasing the volume of the container of hydrogen gas.
The molecules in hydrogen gas have a large space in between them (have very little force of attraction). Gases do not have a definite shape so it occupies the shape of the container. If the volume of the container increases, the molecules occupy that vacant space too. When some of the hydrogen gas leaks it creates vacant space which is now occupied by the present molecule.

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