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JEE Main · 2004 · 24 Apr 2004 · Offline · p-Block Elements

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Which one the following statement regarding helium is incorrect?
  1. (A)It is used to fill gas balloons instead of hydrogen because it is lighter and noninflammable✓ Correct
  2. (B)It is used in gas - cooled nuclear reactors
  3. (C)It is used to produce and sustain powerful superconducting reagents
  4. (D)It is used as cryogenic agent for carrying out experiments at low temperatures

Answer: (A)

Solution

Weigh up each claim about helium. It is genuinely used in gas-cooled reactors, to keep superconducting magnets cold, and as a cryogenic coolant for low-temperature work. The faulty claim is that helium fills balloons because it is lighter than hydrogen; hydrogen, with a mass near one, is in fact the lighter gas, and helium is preferred only because it is non-flammable and inert, not because it is lighter. That is the incorrect statement.

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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