In which of the following conditions, the distance between the molecules of
hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
(iii) Increasing the volume of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the
volume of the container
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

c. ii) and iii) is the correct answer. 

because when pressure is exerted then the molecules come closer to each other.

and also if more hydrogen gas is added to the container and as volume is not increased. so the molecules become closer.

so, i. and iv.  cannot be the required statement.

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