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Three different gases X, Y and Z of molecular masses 2, 16 and 64 were enclosed in a vessel at constant temperature, till equilibrium is reached. Which of the following statement is CORRECT?

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Important Questions on States of Matter (Gases and Liquids)

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At a constant pressure, the density of a certain amount of an ideal gas is ___________
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What mass of an oxygen gas will occupy 8.21 L of volume at 1 atm pressure and 200 K temperature?
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At 25 °C and 1 atm, a vessel contains 20 L of an ideal gas. If the volume of vessel increased to 40 L, the pressure exerted by gas in vessel will be _____________
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Volume of the air that will be expelled from a vessel of 300 cm3 when it is heated from 27°C to 37°C at the same pressure will be ________
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At what temperature will the average speed of CH4 molecules have the same value as that of O2 molecules at 300 K?
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A bubble of a gas released at the bottom of a lake increases to eight times its original volume when it reaches the surface. Assuming that the atmospheric pressure is equivalent to the pressure exerted by a column of water 10 m height, the depth of the lake is ___________