Question

Assertion :If $H_2$ and $C{l}_2$ enclosed separately in the same vessel exert pressure of 100 and 200 $mm$ respectively, their mixture in the same vessel at the same temperature will exert a pressure of 300 $mm$. Reason: Dalton's law of partial pressures states that total pressure is the sum of partial pressures.

Read the above assertion and reason and choose the correct option regarding it.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is D Assertion is incorrect but Reason is correct

Dalton's law of partial pressures:
$P_{total}=P_1+P_2+P_3+...$

$Partialpressure=x\times P_{total}$

where $x=molefraction$

so total pressure is the sum of partial pressures.
but here same mole fraction of gases are not mentioned so it is not sure whether their mixture in the same vessel at the same temperature will exert a pressure of 300 $mm$.