A) Xe
B) He
C) Ar
D) Kr
Correct Answer: B
Solution :
[b] He The natural gas is compressed to about 100 atm and cooled to 73k. Under these conditions, helium does not liquefy while all other gases get liquefied. About 99% pure He is prepare by this method. Ne, Ar, Kr, Xe are obtained by fractionation of liquid air. Radon is obtained as decay product of radium
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