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If two molecules of \( \mathrm{A} \) and \( \mathrm{B} \) having mass \( 100 \mathrm{~kg} \)
P and \( 64 \mathrm{~kg} \) and rate of diffusion of \( \mathrm{A} \) is \( 12 \times 10^{-3} \),

W then what will be the rate of diffusion of \( \mathrm{B} \) ?
(1) \( 15 \times 10^{-3} \)
(2) \( 64 \times 10^{-3} \)
(3) \( 5 \times 10^{-3} \)
(4) \( 46 \times 10^{-3} \)
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