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States of Matter Test - 11

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States of Matter Test - 11
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  • Question 1
    1 / -0
    The value of the universal gas constant $$R$$ depends upon the:
    Solution
    The value of the universal gas constant $$R$$ depends on the units used for pressure, volume and temperature. Therefore, it depends on the units of measurement.
  • Question 2
    1 / -0
    Which of the following is a correct representation for an ideal gas?
    Solution
    $$PV=nRT$$

    $$PV=\dfrac{Mass}{Mol.\ wt}RT$$

    $$P=\dfrac{Mass}{V}\dfrac{RT}{Mol.\ wt}$$

    $$P=d\dfrac{RT}{Mol.\ wt}$$

    $$d= \dfrac {PM} {RT} $$

    $$\implies \dfrac{P_{1}}{d_{1}T_{1}}=\dfrac{P_{2}}{d_{2}T_{2}}$$
  • Question 3
    1 / -0
    The pressure at which liquid and vapour can coexist at equilibrium is called the :
    Solution
    Ordinary evaporation is a surface phenomenon - some molecules have enough kinetic energy to escape. If the container is closed, then an equilibrium is reached where an equal number of molecules return to the surface. 

    The pressure at which this equilibrium where the coexistence of liquid and vapour is achieved is called the saturated vapor pressure.
  • Question 4
    1 / -0
    Aqueous tension is dependent on:
    Solution
    Aqueous tension is defined as the partial pressure of the water vapour present in the moist gas.

    When the gas is collected over the water, it becomes moist due to the presence of a small quantity of water vapour caused by evaporation.

    Then, the pressure exerted by moist gas = pressure exerted by dry gas + pressure of water vapour (aqueous tension).

    Aqueous tension is dependent on temperature. It is independent of volume and pressure.

    Hence, the correct answer is option $$\text{C}$$.
  • Question 5
    1 / -0
    The vapour pressure of a dry gas is:
    Solution
    The vapour pressure of  a dry gas is less than that of wet gas, as aqueous tension is also applied to the vapour pressure of wet gases.
    Pressure (wet gas) = pressure (dry gas) + aqueous tension.
  • Question 6
    1 / -0
    For which of the following mixture of gases, Dalton's law of partial pressure is not applicable at room temperature?
    Solution
    Dalton's law of partial pressure is not applicable at room temperature for a mixture of reacting gases.

    Thus, Dalton's law of partial pressure is not applicable at room temperature for a mixture of (A) hydrogen chloride and ammonia.

    Hence, the correct answer is option $$\text{A}$$.
  • Question 7
    1 / -0
    Which gas cannot be collected over water?
    Solution
    $$CO, N_2$$, and $$H_2$$ do not dissolve in water and hence can be easily collected over water.

    $$NH_3$$ is soluble in water. Soluble gases cannot be collected over water.

    Hence, option A is correct.
  • Question 8
    1 / -0
    The value of gas constant in Joules/ K-mole is:
    Solution
    According to ideal gas equation, $$PV=nRT$$

    P = Pressure, V = Volume, n = number of moles, T = Temperature, n = number of moles.

    The value of a gas constant is 8.314 Joules/K-mole.
  • Question 9
    1 / -0
    Which of the following represents a combination of Boyle's Law and Charle's Law?
    Solution
    Charles' law is the change in volume with respect to temperature at constant pressure, while Boyle's law is the change in volume with respect to pressure at a constant temperature. 

    Taking a gas of volume $$V_1$$, pressure $$P_1$$ and temperature $$T_1$$, and let its change have a state ($$V_2, P_2, T_2$$), then according to Boyle's law, 

    $$P_1V_1=P_2V_2$$                      ..........(1)

    Then keeping this constant pressure, move to state ($$V_2, P_2, T_2$$) using Charles' law,

    $$\dfrac{V_1}{T_1}= \dfrac {V_2}{T_2}$$                   .........(2)

    Solving for $$V_2$$, in both (1) and (2) and then equating them, we get-

    $$ \dfrac {P_1V_1}{T_1} = \dfrac {P_2V_2}{T_2}$$

    After changing the pressure, volume and temperature of the gas, still their product is equal, suggesting that the relation is constant: $$\dfrac {PV}{T}=k$$.

    Hence, the correct answer is option $$\text{B}$$.
  • Question 10
    1 / -0
    Which of the following indicates the value of gas constant?
    Solution
    In a gas equation $$PV = nRT$$ the value of universal gas constant depends upon the units of measurement. Its values are $$\displaystyle  8.314 \: J/mol/K$$, $$\displaystyle 0.0821 L.atm/mol/K$$ , $$\displaystyle 1.987 cal/mol/K $$
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