In the reaction, BrO-3(aq) + 5Br-(aq) + 6H+ 3Br2(l) + 2H2O(l)

The rate of appearance of bromine (Br2) is related to rate of disappearance of bromide

ions as following 

1. d[Br2]/dt = -(3/5)d[Br-]/dt

2. d[Br2]/dt = (5/3)d[Br-]/dt

3. d[Br2]/dt = -(5/3)d[Br-]/dt

4. d[Br2]/dt = (3/5)d[Br-]/dt

Subtopic:  Definition, Rate Constant, Rate Law |
 81%
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NEET - 2009
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The rate constants k1 and k2 for two different reactions are 1016 e-2000/T and 1015 e-1000/T  , respectively. The temperature at which k1=k2 is:

(1) 1000 K

(2) 20002.303K

(3) 2000K

(4) 10002.303K

 

Subtopic:  Arrhenius Equation |
 63%
From NCERT
NEET - 2008
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The bromination of acetone that occurs in acid solution is represented by this equation.

CH3COCH3(aq) + Br2(aq)            CH3COCH2Br(aq) + Br-(aq)

These kinetic data were obtained for given reaction concentrations. 

                   Initial concentrations, M

  CH3COCH3                Br2         H+

       0.30                        0.05           0.05

       0.30                        0.10           0.05

       0.30                        0.10           0.10

       0.40                        0.05           0.20

Initial rate, disappearance of Br2, Ms-1

                        5.7X10-5

                        5.7X10-5

                        1.2X10-4

                        3.1X10-4

Based on these data, the rate equation is

1. Rate = k [CH3COCH3] [H+]

2. Rate = k [CH=COCH3][Br2]

3. Rate = k [CH3COCH3][Br2][H+]2

4. Rate = k [CH3COCH3][Br2][H+]

Subtopic:  Definition, Rate Constant, Rate Law |
 65%
From NCERT
NEET - 2008
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In a first order reaction A               B, if k is rate constant and initial concentration of the reactant A is 0.5 M then the half-life is :

(1) 0.6930.5k

(2) log 2k

(3) log 2k0.5

(4) ln 2k

Subtopic:  Definition, Rate Constant, Rate Law |
 72%
From NCERT
NEET - 2007
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If a first-order reaction reaches 60% completion within 60 minutes, approximately how much time would it take for the same reaction to reach 50% completion? (log 4=0.60, log 5=0.69)

1. 50 min

2. 45 min

3. 60 min

4. 30 min

Subtopic:  First Order Reaction Kinetics |
 74%
From NCERT
NEET - 2007
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For the reaction 2A + B        3C + D which of the following does not express the reaction rate ?

(1) -dC3dt

(2) -dBdt

(3) dDdt

(4) -dA2dt

Subtopic:  Definition, Rate Constant, Rate Law |
 91%
From NCERT
NEET - 2006
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The units of rate constant and rate of reaction are same for: 

1. First order reaction 

2. Second order reaction 

3. Third order reaction 

4. Zero order reaction 

Subtopic:  Definition, Rate Constant, Rate Law |
 81%
From NCERT
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Rate constant K= 1.2×103 mol L-1 s-1 and Ea =2.0×102KJ mol-1. When T , A is equal to 

(1) 2.0 × 102mol-1L-1s-1

(2) 1.2 × 103 mol L-1 s-1

(3) 3.3 × 10 mol L-1 s-1

(4) 2.4 × 103 mol L-1 s-1

Subtopic:  Arrhenius Equation |
 82%
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The effect of a catalyst in a chemical reaction is to change the 

1. Acivation energy.

2. Equilibrium concentration.

3. Heat of reaction.

4. Final products.

Subtopic:  Arrhenius Equation |
 92%
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When the concentration of reactant was made 4 times rate of reaction becomes 8 times. The order of reaction with respect to that reactant is 

1. 2

2. 3

3. 1

4. 1.5

Subtopic:  Order, Molecularity and Mechanism |
 66%
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