The decomposition of NH3 on a platinum surface is a zero-order reaction. The rates of production of N2 and Hwill be respectively:
(given ; k = 2.5 × 10–4 mol–1 L s–1 ) 

1. 2.5 × 10−4 mol L−1 s−1 and 5.5 × 10−4 mol L−1 s−1

2. 2.5 × 10−4 mol L−1 s−1 and 7.5 × 10−4 mol L−1 s−1

3. 1.5 × 10−4 mol L−1 s−1 and 4.5 × 10−4 mol L−1 s−1

4. 0.5 × 10−4 mol L−1 s−1 and 3.5 × 10−4 mol L−1 s−1

Subtopic:  Definition, Rate Constant, Rate Law |
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The rate equation of a reaction is expressed as, Rate = \(k(P_{CH_{3}OCH_{3}})^{\frac{3}{2}}\)

(Unit of rate = bar min–1)

The units of the rate constant will be:
1. bar1/2 min    
2. bar2 min1   
3. barmin2  
4. bar1/2 min1

Subtopic:  Definition, Rate Constant, Rate Law |
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The factor(s) that affect the rate of a chemical reaction is/are:

1. Concentration/Pressure of reactants.
2. Temperature.
3. Presence of a catalyst.​​​​​
4. All of the above.

Subtopic:  Definition, Rate Constant, Rate Law | Catalyst |
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The average rate of reaction between the time interval of 30 to 60 seconds in the below mentioned pseudo 1st order reaction is:
t/s 0 30 60 90
[Ester]/mol L–1 0.55 0.31 0.17 0.085

1. 6.67 ×10-2 mol L-1 s-1
2. 2.67 × 10-4 mol L-1 s-1 
3. 4.67 × 10-3 mol L-1 s-1
4. 4.27 × 103 mol L-1 s-1

Subtopic:  Definition, Rate Constant, Rate Law |
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A reaction is first-order with respect to A and second-order with respect to B. The concentration of B is increased three times. The new rate of the reaction would:

1. Decrease 9 times 2. Increase 9 times
3. Increase 6 times 4. Decrease 6 times
Subtopic:  Definition, Rate Constant, Rate Law |
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In a reaction between A and B, the initial rate of reaction (r0) was measured for different initial concentrations of A and B as given below:

A / mol L–1 0.20 0.20 0.40
B / mol L–1 0.30 0.10 0.05
ro / mol L–1 s–1 5.07 × 10–5 5.07 × 10–5 1.43 × 10–4


The order of the reaction with respect to A and B would be:

1. The order with respect to A is 0.5 and with respect to B is zero
2. The order with respect to A is 1 and with respect to B is 0.5
3. The order with respect to A is 2 and with respect to B is 1
4. The order with respect to A is 1.5 and with respect to B is zero

Subtopic:  Definition, Rate Constant, Rate Law |
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For a reaction, 2A + B C + D, the following observations were recorded:

Experiment [A]/mol L–1 [B]/mol L1 Initial rate of formation
of D/mol L1 min1
I 0.1 0.1 6.0 × 103
II 0.3 0.2 7.2 × 102
III 0.3 0.4 2.88 × 101
IV 0.4 0.1 2.40 × 102

The rate law applicable to the above mentioned reaction would be:

1. Rate = k[A]2[B]3

2. Rate = k[A][B]2

3. Rate = k[A]2[B]  

4. Rate = k[A][B]  

Subtopic:  Definition, Rate Constant, Rate Law |
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For the  reaction 2A + BA2B, rate = kAB2 with k = 2.0×10-6 mol-2L2s-1 and A=0.1 M; B=0.2 M. The initial rate of the reaction will be :

1. 0.04×10-9 mol L-1 s-1

2. 8×10-8 mol-1L s-1

3. 8×10-9 mol L-1 s-1

4. 8×10-7 mol L-1 s-1

Subtopic:  Definition, Rate Constant, Rate Law |
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Given that Rate=kH2O2I-. The dimension of the rate constant in the given rate law is -

1.  mol-1Ls-1 2.  mol-1Ls-2
3.  molL-1s-1 4.  mol-2Ls-1
Subtopic:  Definition, Rate Constant, Rate Law |
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Consider the following rate expression.

Rate=kCH3CHO32

The order of reaction and dimension of the rate constant are, respectively-

1. 32; k = mol-1Ls-1

2. 3; k = mol-1Ls-1

3. 32;  k = mol12L-12s-1

4. 32; k = mol-12L12s-1

Subtopic:  Definition, Rate Constant, Rate Law |
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