Consider the following statements.
I) One gram atom of carbon - 12 contains Avogadro’s number of atoms.
II) One mole of oxygen gas contains Avogadro’s number of molecules.
III) One mole of hydrogen gas contains Avogadro’s number of atoms.
IV) One mole of electron stands for $6.02 \times 10^{23}$ electrons.
Which of the following statements are correct?

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I and II

II and III

I, II and III

I, II and IV

answer is D.

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Detailed Solution

One mole means $6.02 \times 10^{23}$ entities.

One gram atom of carbon -12 means one mole of carbon-12.

Hence, there is $6.02 \times 10^{23}$ no. of C-12 atoms present.

Similar way, 1 mol of $O_{2}$ gas has Avogadro’s number of $O_{2}$ molecules.

$1 mol of electrons = 6.023 \times 10^{23} e^{-} s$

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