Question # 1

Ifk_cof a reaction productis verylarge, it indicates that equilibrium occurs :

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With the help of a catalyst.

With no forward reaction.

At a low product concentration.

At a high product concentration.

The relation between Kc and Kp is

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The rate of which the reaction proceeds is directly proportional to the product of the active masses of the reactants is according to

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Law of mass action

Le Chateliers principle

Equilibrium law

Law of constant proportion

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Introduction of an inert gas at constant volume

Introduction of PCl₃(g) at constant

Introduction of PCl₅(g) at constant volume

Introduction of Cl₂at constant volume

Which one of the following is a buffer

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HCI + NaCI solution

CH₃COOH + CH₃COONH₄solution

H₂SO₄+ CaSO₄solution

CH₃COOH + CH₃COONa

If the difference of pKa values of the two acids is 2, then

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Acid with smaller pKa is 10 times stronger acid

Acid with greater pKa is 10 times stronger acid

Acid with smaller pKa is 100 times stronger acid

Acid with greater pKa is 100 times stronger acid

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

The equilibrium constant in a reversible chemical reaction at a given temperature

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Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentration of rectants

It is characteristic of the reaction

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Initial concentration of acetic acid

Initial concentration of ethyl acetate

Equilibrium concentration of acetic acid

Equilibrium concentration of ethyl acetate

Law of mass action was given by :

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Guldberg and Waage.

Berkeley and Hartly.

Ramsay and Reyleigh.

Berthelot.

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

In a reversible reaction, two substances are in equilibrium. If the concentration of each one is reduced to half, the equilibrium constant will be

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Reduced to half of its original value

Doubled

Same

Reduced to one fourth its original value

The state of equilibrium refers to

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State of rest

Dynamic state

Stationary state

State of inertness

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

Which of the following is a characteristic of a reversible reaction?

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It never proceeds to completion

It can be influenced by a catalyst

It proceeds only in the forward direction

Number of moles of reactants and products are equal

Buffers having pH less than 7 are made

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Mixture of weak acid + salt of it with strong base

Mixture of weak acid + salt of it with weak base

Mixture of weak base + salt of it with strong acid

Mixture of weak base + salt of it with weak base

N₂ + 3H₂ ⇌2NH₃

The unit of K_c for tis reaction will be:

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mol² dm^-6

mol^-2 dm⁺⁶

mol dm^-3

mol^-1 dm⁺³

The solubility of PbF₂is 2.6 x 10^-3mole dm^-3then its solubility product is

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2.6 x 10^-3

6.76 x 10^-6

5.2 x 10^-6

7.0 x 10^-8

Which of the following solution have zero pH

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1 M HCI

MH₂SO₄

0.1 M HNO₃

1 M CH₃COOH

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

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Almost forward reaction is completed.

Amount of reactant is negligible as compared to product.

Amount of product is negligible as compared to reactant.

Amount of product is equal to amount of reactant.

What happens when reaction is at equilibrium and more reactant is added :

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Forward reaction rate is increased.

Forward reaction rate is decreased.

Backward reaction rate is increased.

Equilibrium remains unchanged.

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8

4

9

3

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

Units of Kw are

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Mole dm^-3

Mole²dm^-3

Mole²dm^-6

Mole²dm^-3

An aqueous solution is neutral when its

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pH = 14

pH = zero

pH = 7

Kw = 10^-7

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Total pressure

Amount of A₂and B₂

Temperature

Catalyst

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Moles^-2dm⁺⁶

No units

Mole dm^-3

Mole^-1dm^-3

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The value of K_pfalls with a rise in temperature

The value of K_pfalls with increasing pressure

Adding V₂O₅catalyst increase the equilibrium yield of sulphur trioxide equilibrium yield of sulphur trioxide

The value of K_pis equal to K_c

Reactions that proceed on both sides and never go to completion are called

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Irreversible reactions

Reversible reactions

Opposing reactions

Spontaneous reactions

A solution of NaOH has pH = 13, then concentration of NaOH is

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10^-13M

10¹³M

10^-1M

10⁺¹M

The rate of a chemical reaction is directly;y proportional to product of molar concentration of reaction substance it is called :

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Low of conservation of energy.

Law of mass action.

Rate law .

Active mass rule.

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