Which of the following statements about hydrogen is incorrect ?
(a) hydrogen has three isotopes of which tritium is the most common.
(b) Hydrogen never acts as cation in ionic salts
(c) Hydronium ion, H₃O⁺ exists freely in solution
(d) Dihydrogen does not act as a reducing agent
Answers
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(b) Hydrogen never acts as cation in ionic salts
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Answer:
(d) Dihydrogen does not act as a reducing agent is the incorrect statement.
Explanation:
Hydrogen is the most abundant element in the universe.
It is the third most abundant on earth.
Atomic number of hydrogen is 1.
It has very high ionization enthalpy.
It does not possess metallic character at normal room temperature.
Hydrogen is less reactive.
We'll check each statement.
(a) hydrogen has three isotopes of which tritium is the most common.
It is correct.
It has 3 isotopes protium, Deuterium and tritium.
Tritium is most common and radioactive.
(b) Hydrogen never acts as cation in ionic salts.
It is true. It acts as anion.
(c) Hydronium ion, H₃O⁺ exists freely in solution.
It is correct.
Its ion exists freely in solution.
(d) Dihydrogen does not act as a reducing agent
It is an oxidizing agent.
This the statement is incorrect.