Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Alkali Metals Single Correct MCQ
Published on: August 12, 2026

Dihydrogen has :

A
Two isotopes and no isomers.
B
Three isotopes and two nuclear isomers.
C
Three isotopes and two optical isomers.
D
Two isotopes and two geometrical isomers.

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Verified by Experts
The correct answer is:
B

Hydrogen has three isotopes and two isomers.

Protium Deuterium Tritium Orthohydrogen Parahydrogen

O Electron- 1 1 1

Proton- 1 1 1

(Isomers of hydrogen)

Neutron- Nil 1 2

(Isotopes of hydrogen)

Ortho hydrogen-two protons in hydrogen molecule when spins in the same direction the form is termed as orthohydrogen, and when proton spins are in opposite direction the form is known as para hydrogen.

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