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JEE Main levelSingle correct optionDifficulty 2 of 3ig069

Two identical flasks at the same temperature contain, respectively, $4 g$ of $H X_{2}$ and $64 g$ of $O X_{2}$ . Which of the following is true?

APressure in the $H X_{2}$ flask is twice that in the $O X_{2}$ flask
BPressures in the two flasks are equal
CPressure in the $O X_{2}$ flask is twice that in the $H X_{2}$ flask
DPressure in the $O X_{2}$ flask is sixteen times that in the $H X_{2}$ flask

Answer: B

Moles:

H X_{2}

= 4/2 = 2

,

O X_{2}

= 64/32 = 2

. Equal

n

,

V

and

T

give equal pressure by

P V = n RT

.

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