(i) Noble gases have large positive values of electron gain enthalpy.
(i) Noble gases have large positive values of electron gain enthalpy.
(ii) Helium is used by scuba divers.
(iii) No chemical compound of helium is known.
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[Hint : (i) Due to their electron conflguration.
(ii) Due to its less solubility in blood.
(iii) Due to its high ionization enthalpy.]
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