JEE Main 2004 Chemistry question

Which one the following statement regarding helium is incorrect?

(1)It is used to fill gas balloons instead of hydrogen because it is lighter and non inflammableCorrect
(2)It is used in gas - cooled nuclear reactors
(3)It is used to produce and sustain powerful superconducting reagents
(4)It is used as cryogenic agent for carrying out experiments at low temperatures

Answer: (1)

Solution

Helium (molar mass 4) is heavier than hydrogen (molar mass 2); it replaces hydrogen in balloons because it is non-inflammable, not because it is lighter — so statement

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Question ID VK-038416