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Assertion : 22.4 L of N_(2) at NTP and 5.6 L O_(2) at NTP contain equal number of molecules. Reason : Under similar conditions of temperature and pressure all gases contain equal number of molecules.

Answer»

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If assertion is false but reason is true.

Solution :MOLAR volume (at NTP) `=22.4 L`
Now 22.4 L of `N_(2)=` volume OCCUPIED by one mole of `N_(2)=28` gm `=6.023xx10^(23)` molecules.
Similarly, `O_(2)=2xx16=32 gm`,
`32 gm=6.023xx10^(23)` molecules `=22.4 L`
`:. 22.4 L =6.023xx10^(23) or 5.6 L =(6.023xx10^(23)xx5.6)/22.4`
`=1/4xx6.023xx10^(23)`


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