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ECAT Chemistry Chapter 8 Chemical Equilibrium Online Test MCQs With Answers

Question # 1

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[A] = [B]

[A] < [B]

[B] = [C]

[A] > [B]

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Question # 2

Law of mass action states that rate of chemical reaction is directly proportional to the product of active masses of the reactants. The term active mass means

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Mass in grams converted to products

Number of moles

Number of moles per dm³of reactants

Total pressures of the reactants

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Question # 3

For the above reaction the relationship b/w k_c and k_p will be :

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K_p = K_cRT

Kp = K_c(RT)_-1

K_p = K_c(RT)_-2

K_c = K_p

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Question # 4

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Initial concentration of acetic acid

Initial concentration of ethyl acetate

Equilibrium concentration of acetic acid

Equilibrium concentration of ethyl acetate

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Question # 5

0.1 MHCI has pH = 1.0, it is about 100 times stronger than acetic acid. Then pH of acetic acid will be

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0.1

2.0

1.3

3.0

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Question # 6

A chemical reaction is in equilibrium when

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Formation of product is minimum

Reactants are completely transformed into products

Rates of forward and backward reactions are equal

Equal amounts of reactants and products are present

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Question # 7

The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related

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pH = pKa

pH < pKa

pH > pKa

pH x pKa = 14

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Question # 8

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

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Question # 9

Which of the following favours the reverse reaction in chemical equilibrium?

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Increasing the concentration of the reactant

Removal of the least one of the products at regular intervals

Increasing the concentration of one or more of the products

None of these

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Question # 10

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