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Question

Which of the following statements about hydrogen are correct?

A
Hydrogen ion, H+, exists freely in solution.
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B
Hydrogen has three isotopes of which protium is the most common.
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C
Hydrogen never acts as cation in ionic salts.
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D
Dihydrogen does not act as a reducing agent.
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Solution

The correct option is C Hydrogen never acts as cation in ionic salts.
A.Hydrogen has three isotopes: protium, (11H); deuterium, (21H) or D and tritium,(31H) or T. Among these, protium is the most common (99.98% abundance).

B.Hydrogen acts as anion in ionic salts like NaH,BeH2,MgH2. It does not act as cation in ionic salts.

C.Hydrogen ions, H+ are highly unstable due to extremely small size. So, it does not exist freely. It gets hydrated/solvated and exists as H3O+ in solution.

D.Dihydrogen acts as an oxidising agent as well as reducing agent. It is used in reduction of the metallic ores. CuO(s)+H2(g)Cu(s)+H2O(l)

Hence, options (A) and (B) are correct.

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