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States of Matter: Gases and liquids Test - 1
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States of Matter: Gases and liquids Test - 1

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  • Question 1/10
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    Which gas is most soluble in water?

    Solutions

    Gases like NH3, SO2 and CO2 which react with water are highly soluble.

    The solubility of NH3 in water is maximum as it forms hydrogen bonds with H2O.

     

  • Question 2/10
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    Separation of a mixture of gases on the basis of the difference in their rates of diffusion is called

    Solutions

    Separation of a mixture of gases on the basis of the difference in their rates of diffusion is called atmolysis.
    This is done by allowing the mixture to diffuse through a porous substance and the gas with a faster rate of diffusion will diffuse out first.

     

  • Question 3/10
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    Which gas has the same rate of diffusion as that of CO2 at the same temperature and pressure?

    Solutions

    Both N2O and CO2 have the same rate of diffusion because both have the same molecular weight.

     

  • Question 4/10
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    Which of the following options represents Avogadro's number?

    Solutions

    Avogadro's number is the number of molecules present in one mole of gas at any temperature and pressure.

     

  • Question 5/10
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    The mass of 11.2 L of ammonia gas at STP is

    Solutions

     

  • Question 6/10
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    In the ideal gas equation PV = nRT, the value of R depends only on the

    Solutions

    R is the molar gas constant and its value is constant for all gases, regardless of the nature of the gas, the pressure and the temperature.
    Its value changes only with the units of measurement. It has different values in different units.



    R = 0.0821 L-atm mol-1 K-1
    R = 8.314 J mol-1 K-1

     

  • Question 7/10
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    The following question has four choices, out of which ONLY ONE is correct.

    The density of ammonia gas at 25°C and 2 atm pressure is about

    Solutions

     

  • Question 8/10
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    The following question has four choices out of which ONLY ONE is correct.

    An empty 2.0 l vessel is filled with CH4 (g) at 1.00 atm and O2 (g) at 4.00 atm, at 300oC. A spark causes CH4 to burn completely according to the equation:

    CH4(g) + 2O2(g) → CO2(g) + 2H2O(g), ΔH = – 802 kJ

    Partial pressure of oxygen inside the vessel after combustion is

    Solutions

     

  • Question 9/10
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    If two substances A and B have poA : poB = 1 : 2, where poA and poB are partial vapour pressures of A and B, and have mole fraction in the solution as 1 : 2, then what is the mole fraction of A in vapour phase?

    Solutions

     

  • Question 10/10
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    A mixture of N2 and O2 in the ratio 4 : 1 by volume is heated in an open mouthed flask from 27oC to 127oC. Which of the following statements is/are true?

    Solutions

    Since the molar ratio is the same as the volume ratio, mole fraction of nitrogen is 4/(4 + 1) = 0.8.

     

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