1.

Which of the given statement is incorrect ?

Answer»

`He` is used in production of powerful super CONDUCTING magnets
`He` is used for carrying out experiments at low temperature as a cryogenic AGENT
`He` is used as an INERT shield for arc welding
`He` is used in filling the GAS balloons instead of `H_2` gas, because He is lighter than inflammable

ANSWER :D


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