
(a) He and O2
(b) O2 and He
(c) He and Ar
(d) O2 and N2
Answer-b
(141)
5/5 - (8 votes)

(a) He and O2
(b) O2 and He
(c) He and Ar
(d) O2 and N2
Answer-b
(141)
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