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JEE Main levelSingle correct optionDifficulty 2 of 3ig070

$3.0 L$ of $N X_{2}$ at $2.0 atm$ and $1.0 L$ of $O X_{2}$ at $4.0 atm$ are transferred at constant temperature into a $2.0 L$ evacuated vessel. The total pressure in the vessel is

A $5.0 atm$
B $6.0 atm$
C $3.0 atm$
D $10.0 atm$

Answer: A

p_{N X_{2}} = 2.0 \times 3.0/2.0 = 3.0 atm

,

p_{O X_{2}} = 4.0 \times 1.0/2.0 = 2.0 atm

. By Dalton's law total

= 5.0 atm

.

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