1.

    A chemical equilibrium is established when:

    A

    All reactants are consumed.

    B

    The rate of the forward reaction is equal to the rate of the reverse reaction.

    C

    The concentration of reactants is equal to the concentration of products.

    D

    The temperature of the system reaches room temperature.

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    1.

    The equilibrium constant in a reversible reaction at a given temperature

    A

    Does not depend on the initial concentrations

    B

    Depends on the initial concentrations of the reactants

    C

    Depends on the concentration of the products at equilibrium

    D

    It is not characteristic of the reaction

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    3.

    Which statement is false in case of equilibrium state?

    A

    The rate of forward reaction equals the rate of backward reaction.

    B

    The Gibbs free energy change is zero.

    C

    The concentrations of reactants and products are constant.

    D

    The equilibrium constant is always equal to 1.

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    6.

    Which is a reversible reaction?

    A

    H2+I2o2HI{{\rm{H}}_2} + {{\rm{I}}_2} o 2{\rm{HI}}

    B

    H2SO4+Ba(OH)2oBaSO4↓+2H2O{{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4} + {\rm{Ba}}{\left( {{\rm{OH}}} \right)_2} o {\rm{BaS}}{{\rm{O}}_4} \downarrow + 2{{\rm{H}}_2}{\rm{O}}

    C

    NaCl+AgNO3oNaNO3+AgCl↓{\rm{NaCl}} + {\rm{AgN}}{{\rm{O}}_3} o {\rm{NaN}}{{\rm{O}}_3} + {\rm{AgCl}} \downarrow

    D

    2KClO3o2KCl+3O2↑2{\rm{KCl}}{{\rm{O}}_3} o 2{\rm{KCl}} + 3{{\rm{O}}_2} \uparrow

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    7.

    Just before a reversible reaction attains equilibrium it is found that:

    A

    The velocity of both forward reaction and backward reaction is also increasing

    B

    The velocity of the forward reaction is decreasing and that of backward reaction in increasing

    C

    The velocity of both forward and backward reactions is decreasing

    D

    All of the above

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