Organic Chemistry Objective Questions and Answers | Organic Chemistry MCQs and Answers

Questions

1 For reaction system given below, volume is suddenly reduced to half of its value by increasing the pressure on it. If the reaction is of first order with respect to O₂ and second order with respect to NO, what will be the change in the rate of reaction?

2NO(g) + O₂(g) + 2NO₂(g)

A diminish to one-fourth of its initial value

B diminish to one-eight of its initial value

C increase to eight times of its initial value

D increase to four times of its initial value

View Answer

Answer: increase to eight times of its initial value

2 The rate law for a reaction between the substances A and B is given by rate = K[A]n [B]m. On doubling the concentration of A and halving the concentration of B. What will be the ratio of the new rate of the earlier rate of the reaction?

A (½)^m+n

B m+n

C n-m

D 2^n-m

View Answer

Answer: 2^n-m

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3 Rate = If the volume of reaction vessel is suddenly reduced to ¼^th of initial value. How new rate will be affected?>

A 1/10

B 1/8

C 8

D 16

View Answer

Answer: 16

4 On which factor the rate constant of a reaction does not depend upon?

A temperature

B activation energy

C catalyst

D concentration of reactants and products

View Answer

Answer: concentration of reactants and products

5 The rate of reaction, A + B Products, is given by the equation, r = k[A][B]. If B is taken in excess, what would be the order of reaction?

A 2

B 1

C zero

D unpredictable

View Answer

Answer: 1

6 In a reaction, 2A₂ + B₂ → 2A₂B, when the reactant A will disappear?

A half the rate that B will decrease

B the same rate that B will decrease

C double the rate that A2B will form

D twice the rate that B will decrease

View Answer

Answer:twice the rate that B will decrease

7 The rate of reaction that does not involve gases, is not dependent on _____________

A pressure

B temperature

C concentration

D catalyst

View Answer

Answer: pressure

8 Which is not true for a second order reduction?

A It can have rate constant 1 x 10^-2 L mol^-1 s^-1

B Its half-life is inversely proportional to its initial concentration

C Time to complete 75% reaction is twice of half-life

D T₅₀ = 1/(k_a⋅A₀)

View Answer

Answer: Time to complete 75% reaction is twice of half-life

9 The rate of decomposition of a substance increases concentration of substance at same temperature. Find out order of reaction.

A 1

B 2

C 3

D 0

View Answer

Answer: 2

10 If a reaction is n^th order the half-life period ________ of the initial concentration of the reactants.

A is independent

B varies inversely as (n-1)th power

C varies inversely as nth power

D varies directly as (n-1)th power

View Answer

Answer:varies inversely as (n-1)th power

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