Which of the following gases can be liquefied easily? (A) \( \mathrm{He} \) (B) \( \mathrm{NH}_{...
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0Which of the following gases can be liquefied easily?
(A) \( \mathrm{He} \)
(B) \( \mathrm{NH}_{3} \)
(C) \( \mathrm{H}_{2} \)
(D) \( \mathrm{H}_{2} \mathrm{O} \)
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