1.

Which statement regarding He is incorrect?A. a.it is used in gas cooled nuclear reactorB. it is used as a cryogenic agent for carrying out experiment at low temperatureC. b.it is used to produce and sustain powerful superconducting magnetsD. c.it is used to fill gas balloons instead of `H_(2)` because it is lighter and non-combustible

Answer» Correct Answer - d
Option (a),(b)and (c ) are uses of He. Helium is heavier than `H_(2)`


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