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The molecules of a given mass of a gas have r.m.s, velocity of 200 ms-1 at 27°C and 1.0 x 105 Nm-2 pressure. When the temperature and pressure of the gas are respectively, 127°C and 0.05 X 10Nm-2 the rms velocity of its molecules in   ms-1 is

(a)400/√3         (b)100√2/3

(c)100/3            (d)100√2

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