Which one of the following statements is not correct?
[amp_mcq option1=”Hydrogen is an element” option2=”Hydrogen is the lightest element” option3=”Hydrogen has no isotopes” option4=”Hydrogen and oxygen form an explosive mixture” correct=”option3″]
This question was previously asked in
UPSC CDS-1 – 2016
The statement that is not correct is “Hydrogen has no isotopes”.
Hydrogen is indeed an element and the lightest element. A mixture of hydrogen and oxygen is highly explosive. However, hydrogen has three naturally occurring isotopes: Protium (¹H), Deuterium (²H or D), and Tritium (³H or T). They differ in the number of neutrons (0, 1, and 2 respectively) while all having one proton.