The Vander Waals constant 'a' for the gases CH4, N2, NH3 and O2 are 2.25,1.39, 4.17 and 1.3 $L ^{2}$ $atm-mol^{-2}$ respectively. The gas which shows highest critical temperature is :
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The vander Waals' constant 'a' for the gases $CH _{4^{\prime}} N _2,  NH _{3}$ and $O _{2}$ are $2.25,1.39,4.17$ and $1.3 L ^{2}$ $atm-mol ^{-2}$ respectively. The gas which shows highest critical temperature is :

(A) $CH _{4}$

(B) $N _{2}$

(C) $NH _{3}$

(D) $O _{2}$

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The gas which shows highest critical temperature is NH3 . So, The correct option of this question is (C).

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