Which of the following statements about hydrogen is incorrect?

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Hydronium ion, $H_{3} O^{+}$ exists freely in solution.

Dihydrogen does not act as a reducing agent.

Hydrogen has three isotopes of which tritium is the least common.

Hydrogen never acts as cation in ionic salts.(generally)

answer is B.

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Detailed Solution

Option-2 is correct. Dihydrogen acts as a powerful reducing agent and reduces metal oxides such as $CuO, ZnO, PbO$ and ${Fe}_{3} O_{4}$ to their respective metals.

$\begin{array}{l} CuO + H_{2} & ⟶ Cu + H_{2} O \\ ZnO + H_{2} & ⟶ Zn + H_{2} O \\ {Fe}_{3} O_{4} + 4 H_{2} & ⟶ 3 Fe + 4 H_{2} O \end{array}$

Hydrogen has three isotopes of which protium is the most common and tritium is radioactive.

Therefore, third option is also correct. Basically, this question has two correct options-2 and 3. Also, according to answer key published by NTA , 2 and 3 are correct answers.

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