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Which of the following pair of gases cannot be separated by diffusion method ?

$(a)\;SO_{2}\;and\;H_{2}\qquad(b)\;CO_{2}\;and\;N_{2}O\qquad(c)\;NH_{3}\;and\;N_{2}\qquad(d)\;CO_{2}\;and\;H_{2}$

Answer : $\;CO_{2}\;and\;H_{2}$
$CO_{2}\;and\;N_{2}O\;$of gases cannot be separated by diffusion method