JEE Main Chemistry question

Which one of the following statements regarding helium is incorrect? [Jamia Millia Islamia 2007]

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

Answer: (A)

Solution

Helium is actually heavier than hydrogen (the second-lightest element after ), so the reasoning "lighter [than hydrogen]" in (A) is factually wrong; helium is used in balloons for its

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Question ID VK-145819