(C) The number $6.02 \times 10^{23}$ is known as Avogadro's number $(N_A)$.By definition,one mole of any substance contains exactly $6.02 \times 10^{2

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(C) The number $6.02 \times 10^{23}$ is known as Avogadro's number $(N_A)$.By definition,one mole of any substance contains exactly $6.02 \times 10^{23}$ elementary entities (atoms,molecules,or ions),regardless of the temperature,pressure,or volume of the substance.Therefore,the Assertion is correct.However,the definition of a mole does not depend on $S.T.P.$ (Standard Temperature and Pressure) conditions.$S.T.P.$ conditions are only relevant when calculating the volume occupied by one mole of an ideal gas (which is $22.4 \ L$ at $S.T.P.$).Thus,the Reason is incorrect.

Class 11 Physics Kinetic Theory of Gases Gas Laws (Charles, Boyle's, Avagadro's, Gay Lussacs and Dalton's law) and Ideal gas Equation

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$Assertion :$ One mole of any substance at any temperature or volume always contains $6.02 \times 10^{23}$ molecules.
$Reason :$ One mole of a substance always refers to $S.T.P.$ conditions.

AIIMS 2016 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 both the Assertion and Reason are incorrect.

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Kinetic Theory of Gases

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Gas Laws (Charles, Boyle's, Avagadro's, Gay Lussacs and Dalton's law) and Ideal gas Equation

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$Assertion :$ One mole of any substance at any temperature or volume always contains $6.02 \times 10^{23}$ molecules.$Reason :$ One mole of a substance always refers to $S.T.P.$ conditions.

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Equal masses of $N_2$ and $O_2$ gases are filled in containers $A$ and $B$ respectively. The volume of container $B$ is twice the volume of container $A$. What is the ratio of the pressure in container $A$ to that in container $B$?

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$Assertion :$ One mole of any substance at any temperature or volume always contains $6.02 \times 10^{23}$ molecules.
$Reason :$ One mole of a substance always refers to $S.T.P.$ conditions.