The half-life for a zero-order reaction having 0.02 M initial concentration of reactant is 100 s. The rate constant (in mol L–1 s–1) for the reaction is:
1.
2.
3.
4.
What does ZAB represent in the collision theory of chemical reactions?
1. | The fraction of molecules with energies greater than Ea |
2. | The collision frequency of reactants, A and B |
3. | Steric factor |
4. | The fraction of molecules with energies equal to Ea |
The unit of rate constant for a zero-order reaction is:
1.
2.
3.
4.
The half-life of a certain enzyme catalysed reaction is 138 s, that follow the 1st order kinetics. The time required for the concentration of the substance to fall from 1.28 mg L–1 to 0.04 mg L–1, is:
1. 276 s
2. 414 s
3. 552 s
4. 690 s
The rate of the reaction can be written in three ways:
The relationship between k and k′ and between
k and k′′ are-
1. k′ = k, k′′= k
2. k′= 2k; k′′= k
3. k′= 2k, k′′= k/2
4. k′ = 2k; k′′= 2k
The rate of the reaction
2NO + Cl2 → 2NOCl is given by the rate equation
rate = k[NO]2[Cl2]
The value of the rate constant can be increased by:
1. Increasing the concentration of NO
2. Increasing the concentration of Cl2
3. Increasing the temperature
4. All of the above
A 300-gram radioactive sample has a half-life of 3 hours. After 18 hours the remaining quantity will be:
1. 4.68 gram
2. 2.34 gram
3. 3.34 gram
4. 9.37 gram
The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is:
1. 2
2. –1
3. 1
4. –2
For a first-order reaction A → B the reaction rate at a reactant concentration of 0.01M is found to be . The half-life period of the reaction is:
1. | 300s | 2. | 30s |
3. | 220s | 4. | 347s |
If the concentration of a solution is changed from 0.2 to 0.4, then what will be rate and rate constant. The reaction is of first order and rate constant is :
1.
2.
3.
4.