First slide

Hydrogen

Question

Which of the following statements about hydrogen is incorrect?

Moderate

A

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

Dihydrogen does not act as a reducing agent.
C

Hydrogen has three isotopes of which tritium is the most common.
D

Hydrogen never acts as cation in ionic salts.

Solution

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 can also be the answer

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