The activation energy can be lowered by

1.  Increasing temperature

2.  Lowering temperature

3.  Adding a catalyst

4.  Removing the products

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4
Correct Answer :

Adding a catalyst


Explanation :
No Explanation available for this question

The ratio of the time taken for 99.9% reaction and half change of the reaction is

1.  100

2.  49.95

3.  10

4.  1000

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4
Correct Answer :

10


Explanation :
No Explanation available for this question

Starting with one mole of a compound X, it is found that the reaction is 3/4 complete in 1 min. What is the rate constant if the reaction follows first order

1.  0.213sec-1

2.  2.31sec-1

3.  0.0231sec-1

4.  2.31x10-3sec-1

View Answer  
4
Correct Answer :

0.0231sec-1


Explanation :
No Explanation available for this question

The decomposition of ozone proceeds as: O3↔ O2+O,O+O3→ 2O2 The rate expression should be

1.  Rate =k[O3]2

2.  Rate =k[O3]2[O2]-1

3.  Rate =k[O3][O2]

4.  Rate =k[O3][O2]-1

View Answer  
4
Correct Answer :

Rate =k[O3]2[O2]-1


Explanation :
No Explanation available for this question

Consider the zero order reaction :R↔ P Starting with 4 moles of R in a one litre container, after half an hour only 1 mole of R is left unreacted. The value of k for the reaction is

1.  0.1mol L-1min-1

2.  0.3mol L-1min-1

3.  1mol L-1min-1

4.  0.4 mol L-1min-1

View Answer  
4
Correct Answer :

0.1mol L-1min-1


Explanation :
No Explanation available for this question

A zero order reaction is one

1.  Whose rate is not affected by concentration

2.  In which the reactants do not react

3.  In which one of the reactants is in large excess

4.  In which concentration of reactants changed with time

View Answer  
4
Correct Answer :

Whose rate is not affected by concentration


Explanation :
No Explanation available for this question

For the half life period of a first order reaction, which one of the following statements is generally false

1.  It is independent of initial concentration

2.  It decreases with the introduction of a catalyst

3.  It increases with increase of temperature

4.  It is inversely proportioanl to rate constant

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4
Correct Answer :

It increases with increase of temperature


Explanation :
No Explanation available for this question

If the concentrations are expressed in mol litre and time in sec, then the units of the rate constant for the first order reaction are:

1.  molliter-1sec-1

2.  mol-1 litre sec-1

3.  sec-1

4.  mol2 litre-2 sec-1

View Answer  
4
Correct Answer :

sec-1


Explanation :
No Explanation available for this question

Consider the chemical reaction, N2(g)+3H2(g)→2NH3(g). The rate of this reaction can be expressed in terms of time derivation of concentration o N2(g),H2(g)or NH3(g). Identify the correct relationship amongst the rate expressions:

1.  Rate =-d[N2]/dt=-1/3d[H2]/dt=12d[NH3]/dt

2.  Rate =-d[N2]/dt=-3d[H2]/dt=2d[NH3]/dt

3.  Rate =d[N2]/dt=-1/3d[H2]/dt=1/2d[NH3]/dt

4.  Rate =-d[N2]/dt=-d[H2]/dt=d[NH3]/dt

View Answer  
4
Correct Answer :

Rate =-d[N2]/dt=-1/3d[H2]/dt=12d[NH3]/dt


Explanation :
No Explanation available for this question

The rate of a reaction can be increased in general by all the following factors except

1.  By increasing temperature

2.  By using a suitable catalyst

3.  By increasing activation energy

4.  By increasing the concentration of reactant

View Answer  
4
Correct Answer :

By increasing activation energy


Explanation :
No Explanation available for this question
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