JEE Main Chemistry question

Which statement regarding He is incorrect?

(A)It is used in a gas-cooled nuclear reactor
(B)It is used as a cryogenic agent for carrying out experiments at low temperature
(C)It is used to produce and sustain powerful superconducting magnets
(D)It is used to fill gas balloons instead of because it is lighter and non-combustibleCorrect

Answer: (D)

Solution

Helium is indeed non-combustible, but it is not lighter than — hydrogen remains the lightest known gas. Statement (D)'s given reasoning is therefore partly false, making it the

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Question ID VK-147060