# The activation energy can be lowered by

1.  Increasing temperature

2.  Lowering temperature

4.  Removing the products

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4

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

4