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Question

Which of the following statements about Hydrogen is incorrect?


A

Hydrogen has three isotopes, of which, tritium is the most common

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B

Hydrogen never acts as cation in ionic salts.

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C

Hydronium ion, H3O+ exists freely in solution.

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D

Dihydrogen does not act as a reducing agent

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Solution

The correct option is A

Hydrogen has three isotopes, of which, tritium is the most common


Explanation of correct option

Isotopes of hydrogen: There are three known isotopes, of hydrogen, each possessing an atomic number 1 and atomic masses 1,2 and 3 respectively,
these are named protium, deuterium, and tritium.

  • Protium: This isotope constitutes 99.984 per cent of the total hydrogen available in nature.
  • Deuterium: It constitutes only 0.016 per cent of the total hydrogen occurring in nature.
  • Tritium: It constitutes 1 x 10-15 per cent of the total natural hydrogen.

The most common available isotope of hydrogen is protium, not tritium.

Explanation of Incorrect option

Properties of hydrogen:

  • Hydrogen is a colourless, odourless, and tasteless gas.
  • Hydrogen is only slightly soluble in water, about 2 volumes in 100 volumes of water at 0°C.
  • Hydrogen is the lightest of all elements.
  • Hydrogen is diatomic in nature.
  • Hydrogen has low melting and boiling points
  • Hydrogen never acts as a cation in ionic salts.
  • Hydronium ion, H3O+ exists freely in solution.
  • Dihydrogen does not act as a reducing agent

Hence, Option (A) is the correct option.


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