Half-life is independent of the concentration of a reactant. After 10 minutes, the volume of N2 gas is 10 L and after complete reaction, it is 50 L. Hence, the rate constant is:

1. 2.30310log 5 min-1

2. 2.30310 log 1.25 min-1

3. 2.30310 log 2 min-1

4. 2.30310 log 4 min-1

Subtopic:  First Order Reaction Kinetics |
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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 |
 79%
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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 |
 82%
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Consider a reaction A + B → C. If the initial concentration of A was reduced from 4M to 2M in 1 hour and from 2M to 1M in 0.5 hours, the order of the reaction is

1. One

2. Zero

3. Two

4. Three

Subtopic:  Definition, Rate Constant, Rate Law |
 59%
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A gaseous reaction A2(g) → B(g) + 12C(g) shows increase in pressure from 100 mm to 120 mm in 5 minutes. The rate of disappearance of Awill be : 

1. 4 mm min-1 2. 8 mm min-1
3. 16 mm min-1 4. 2 mm min-1
Subtopic:  Definition, Rate Constant, Rate Law |
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During the formation of ammonia by Haber's process N+ 3H2 → 2NH3, the rate of appearance of NH3 was measured as 2.5 x 10-4 mol L-1 s-1. The rate of disappearance of H2 will be: 

1. 2.5 x 10-4 mol L-1 s-1

2. 1.25 x 10-4 mol L-1 s-1

3. 3.75 x 10-4 mol L-1 s-1

4. 15.00 x 10-4 mol L-1 s-1

Subtopic:  Definition, Rate Constant, Rate Law |
 84%
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For a chemical reaction, A   products, the rate of reaction doubles when the concentration of A is increased by 4 times. The order of the reaction is 

1. 4

2. 0

3. 1/2

4. 1

 

Subtopic:  Order, Molecularity and Mechanism |
 84%
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The correct expression for the 3/4th life of a first-order reaction is:

1k2.303log43
22.303klog34
32.303klog 4
42.303k log 3

Subtopic:  Definition, Rate Constant, Rate Law |
 61%
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From the plot of log k vs 1/T, following parameter can be calculated:

1. Activation energy.

2. Rate constant of reaction .

3. Order of reaction.

4. Activation energy as well as the frequency factor.

Subtopic:  First Order Reaction Kinetics |
 52%
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For an endothermic reaction, where ΔH represents the enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be

1. Less than ΔH

2. Zero

3. More than ΔH

4. Equal to ΔΗ

Subtopic:  Arrhenius Equation |
 70%
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