Which is one of the following is not equal to gram molecular mass of Hydrogen?Select an answerA2 gmB 6.022 × 1023  atoms of hydrogenC 6.022 × 1023  molecules of hydrogenD1 mole of hydrogen

The correct answer is B. 6.022 × 10^23 atoms of hydrogen.

Here's why:

A. 2 gm is the gram molecular mass of Hydrogen (H2, not H).

B. 6.022 × 10^23 atoms of hydrogen is not equal to the gram molecular mass of Hydrogen. This is because 1 mole of hydrogen atoms (H, not H2) has a mass of approximately 1 gram, not 2 grams.

C. 6.022 × 10^23 molecules of hydrogen (H2) is equal to the gram molecular mass of Hydrogen. This is because 1 mole of hydrogen molecules (H2) has a mass of approximately 2 grams.

D. 1 mole of hydrogen (H2, not H) is equal to the gram molecular mass of Hydrogen. This is because 1 mole of any substance is equal to its gram molecular mass. For hydrogen (H2), this is approximately 2 grams.