(D) The molar mass of water vapor $(H_2O)$ is $18 \ g/mol$,while the average molar mass of dry air (mostly $N_2$ and $O_2$) is approximately $29 \ g/m

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(D) The molar mass of water vapor $(H_2O)$ is $18 \ g/mol$,while the average molar mass of dry air (mostly $N_2$ and $O_2$) is approximately $29 \ g/mol$.Since water vapor replaces heavier air molecules,wet air is actually lighter than dry air,making the Assertion incorrect.The density of dry air is much lower than the density of liquid water,making the Reason also incorrect.

Class 11 Chemistry States of Matter Mix Examples- States of Matter

Medium

Assertion : Wet air is heavier than dry air.
Reason : The density of dry air is more than density of water.

AIIMS 1999 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If the Assertion is incorrect but the Reason is correct.

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Assertion : Wet air is heavier than dry air.Reason : The density of dry air is more than density of water.

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Which of the following has higher surface tension: pure water or soapy water?

At $STP$,what is the actual volume occupied by the molecules of $1 \, \text{mol}$ of water vapor (i.e.,$\text{Avogadro's number} \times \text{volume of one molecule}$)?

At $27^{\circ} C$,$500 \ mL$ of helium diffuses in $30 \ minutes$. What is the time (in hours) taken for $1000 \ mL$ of $SO_2$ to diffuse under the same experimental conditions?

$A$ $4 : 1$ molar mixture of $He$ and $CH_4$ is kept in a vessel at $20 \ bar$ pressure. Due to a hole in the vessel,the gas mixture leaks out. What is the composition of the mixture effusing out initially?

Which of the following is a superfluid?

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Assertion : Wet air is heavier than dry air.
Reason : The density of dry air is more than density of water.