Question

Which of the following statements about hydrogen is/are correct?
1. Hydrogen has three isotopes of which protium is the most common.
2. Hydrogen ion $\left(H^{+}\right)$ exists freely in solution.
3. Dihydrogen, $H_2$, acts as a reducing agent.
Select the correct answer using the code given below.

• A. 1, 2 and 3
• B. 1 only
• C. 1 and 3 only
• D. 3 only

Answer 1

The correct option is B 1 only

1. Hydrogen has 3 isotopes namely protium, deuterium and tritium containing one proton each and one, two and three neutrons respectively. out of them protium is the most common isotope(99.98% abundance). Hence statement 1 is true.

2. Hydrogen ion ($H^{+}$) does not exists freely in solution. It exists as $H_3{O}^{+}$ ion in the solution. Hence statement 2 is false.

3. Dihydrogen can accept proton and can form $H^{+}$ ion, it can loose electron as well and form $H^{-}$ ion. Both of them are stable. Hence $H_2$ can act as both oxidising and reducing agent. Hence statement 3 is false.