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Q.

Which of the following statements about hydrogen is incorrect?

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a

Hydronium ion, H3O+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.

answer is B.

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Detailed Solution

Dihydrogen acts as a powerful reducing agent and reduces metal oxides such as CuO,ZnO,PbO and Fe3O4 to their respective metals.CuO+H2⟶Cu+H2OZnO+H2⟶Zn+H2OFe3O4+4H2⟶3Fe+4H2OHydrogen 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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