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Chemical Equilibrium Test - 1

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Chemical Equilibrium Test - 1
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  • Question 1
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    The following question has four choices out of which ONLY ONE is correct.
    An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm pressure. Ammonium hydrogen sulphide decomposes to yield NH3 and H2S gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm. The equilibrium constant for NH4HS decomposition at this temperature is 

  • Question 2
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    H2O(l) ⇌ H2O (vap). This equation best illustrates the

    Solution

    The number of water molecules from the gaseous state into the liquid state also increases till the equilibrium is attained i.e., rate of evaporation = rate of condensation
    At equilibrium the pressure exerted by the water molecules at a given temperature remains constant and is called the equilibrium

  • Question 3
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    The mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to the pressure of the gas above the solvent.

    Solution

    This equilibrium is governed by Henry’s law, which states that the mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to the pressure of the gas above the solvent. This amount decreases with increase of temperature.

  • Question 4
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    The Bronsted acid which gives the weakest conjugate base is

  • Question 5
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    In the dynamic equilibrium stage, one of the following events take place. Choose the right one.

  • Question 6
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    The dynamic nature of chemical equilibrium can be demonstrated in the synthesis of ammonia by Haber.s process. Choose the appropriate option given below

    Solution

    Use of isotope (deuterium) in the formation of ammonia clearly indicates that chemical reactions reach a state of dynamic equilibrium in which the rates of forward and reverse reactions are equal and there is no net change in composition.

  • Question 7
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    The factor that does not affect the state of equilibrium is 

  • Question 8
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    When the rate of evaporation is equal to the rate of condensation, it is called

    Solution

    At equilibrium, the rate of evaporation is equal to the rate of condensation.
    It may be represented by H2O (l) ⇌ H2O (vap)
    The double half arrows indicate that the processes in both the directions are going on simultaneously. The mixture of reactants and products in the equilibrium state is called an equilibrium mixture

  • Question 9
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    pKa values of four acids are given below at 25°C. Indicate the strongest acid.

  • Question 10
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    Which of the following represent(s) conjugate(s) of NH3?

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