Subtopic:  Definition, Rate Constant, Rate Law |
 96%
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A reactant with initial concentration 1.386 mol litre-1 showing first order change takes 40 minute to become half. If it shows zero order change taking 20 minute to becomes half under the similar conditions, the ratio, K1/K0 for first order and zero order kinetics will be:

(1) 0.5 mol-1 litre

(2) 1.0 mol/litre

(3) 1.5 mol/litre

(4) 2.0 mol-1 litre

 

Subtopic:  First Order Reaction Kinetics |
 75%
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In a first order reaction, the concentration of the reactant is decreased from 1.0 M to 0.25M in 20 minute. The rate constant of the reaction would be:

(1) 10min-1

(2) 6.931 min-1

(3) 0.6931 min-1

(4) 0.06931 min-1

Subtopic:  First Order Reaction Kinetics |
 76%
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The rate constant of a first order reaction is 4x10-3 sec-1. At a reactant concentration of 0.02 M, the rate of reaction would be:

(a) 8 x 10-5 Msec-1

(b) 4 x 10-3 Msec-1

(c) 2 x 10-1 Msec-1

(d) 4 x 10-1 Msec-1

Subtopic:  First Order Reaction Kinetics |
 77%
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If concentration of reactants is increased by 'X', the rate constant K becomes:

(a) eK/X

(b) K/X

(c) K

(d) X/K

Subtopic:  Definition, Rate Constant, Rate Law |
 70%
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A graph plotted between log (t) 50% vs. log (a) concentration is a straight line. What conclusion can you draw from the given graph?

(a) n=1, t1/2 = 1/K.a

(b) n=2, t1/2 = 1/a

(c) n=1, t1/2 = 0.693/K

(d) None of the above

Subtopic:  Order, Molecularity and Mechanism |
 88%
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The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about :

(a) 10 times

(b) 24 times

(c) 32 times

(d) 64 times

Subtopic:  Definition, Rate Constant, Rate Law |
 91%
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Consider the reaction:

Cl2(aq) + H2S(aq) → S(s) +2H+(aq) +2Cl-(aq)

The rate equation for this reaction is rate = k[Cl2][H2S] Which of these mechanisms is/are consistent with this rate equation?

A. Cl+ H2S → H+ Cl- +Cl+ + HS- (slow)

cl+ + HS- → H+ +Cl- + S (fast)

B. H2 H+ + HS- (fast equilibrium)

Cl2 + HS- → 2Cl- + H+ + S (slow)

(1) A only

(2) B only

(3) Both A and B

(4) Neither A nor B

Subtopic:  Definition, Rate Constant, Rate Law |
 69%
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The activation energies of the forward and backward reactions in the case of a chemical reaction are 30.5 and 45.4 KJ/mol respectively. The reaction is

1. Exothermic

2. Endothermic

3. Neither exothermic nor endothermic

4. Independent of temperature

Subtopic:  Arrhenius Equation |
 83%
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The t0.5 for the first order reaction.

PCl5(g) PCl3(g) + Cl2(g) is 20 min. The time in which the conc. of PClreduces to 25% of the initial conc. is close to 

1. 22 min

2. 40 min

3. 90 min

4. 50 min

Subtopic:  First Order Reaction Kinetics |
 83%
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