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JEE Main levelSingle correct optionDifficulty 2 of 3ig073

Which of the following mixtures would be hardest to separate by gaseous diffusion?

A $H X_{2}$ and $D X_{2}$
B $X_{235} X_{2}^{2235} UF X_{6}$ and $X_{238} X_{2}^{2238} UF X_{6}$
C $He$ and $Ne$
D $CH X_{4}$ and $CO X_{2}$

Answer: B

Separation depends on

M_{2} / M_{1}

. For the uranium hexafluorides the ratio is

352/349 = 1.0043

, far closer to 1 than for the other pairs (

2 = 1.41

for

H X_{2} / D X_{2}

,

5

for He/Ne,

2.75

for

CH X_{4} / CO X_{2}

), so many stages are needed.

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