NEET 2016 Chemistry question

Not in JEE Main or NEET syllabus

Which of the following statements about hydrogen is incorrect?

(1)Hydrogen has three isotopes of which tritium is the most common.Correct
(2)Hydrogen never acts as cation in ionic salts.
(3)Hydronium ion, exists freely in solution.
(4)Dihydrogen does not act as a reducing agent.Correct

Answer: (1),(4)

Solution

(1) is incorrect: hydrogen has three isotopes, protium (, 99.985%), deuterium () and tritium (), of which protium is by far the most abundant; tritium is radioactive and occurs only in trace amounts. (2) is correct: in ionic salts hydrogen occurs as the hydride ion , not

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Question ID VK-091887