For a first-order reaction A \(\rightarrow\) Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min-1 is
1. | 0.2303 | 2. | 1.3818 |
3. | 0.9212 | 4. | 0.4606 |
1. | 0.16 M | 2. | 0.32 M |
3. | 0.08 M | 4. | 0.04 M |
The rate constant for a first order reaction is . The time required to reduce 2.0 g of the reactant to 0.2 g is:
1. | 200 s | 2. | 500 s |
3. | 1000 s | 4. | 100 s |
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by:
1. t=2.303/k
2. t=0.693/k
3. t=6.909/k
4. t=4.606/k
A first-order reaction has a rate constant of 2.303 . The time required for 40 g of this reactant to reduce to 10 g will be [Given that ]
1. 230.3 s
2. 301 s
3. 2000 s
4. 602 s
A first-order reaction has a specific reaction rate of
10-2 sec-1. How much time will it take for 20 g of the reactant to reduce to 5 g?
1. | 138.6 sec | 2. | 346.5 sec |
3. | 693.0 sec | 4. | 238.6 sec |
In a zero-order reaction for every 10 ° rise of temperature, the rate is doubled.
If the temperature is increased from 10 °C to 100 °C,
the rate of the reaction will become:
1. 256 times
2. 512 times
3. 64 times
4. 128 times
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 reaction of hydrogen and iodine monochloride is given as:
H2(g) + 2ICl(g) → 2HCl(g) + I2(g)
This reaction is of first order with respect to H2(g) and ICl(g), for which of the following proposed mechanisms:
Mechanism A:
H2(g) + 2ICl(g) → 2HCl(g) + I2(g)
Mechanism B:
H2(g) + ICl(g) →HCl(g) + HI(g); slow
HI(g) + ICl(g) →HCl(g) + I2(g); fast
1. B Only
2. A and B both
3. Neither A nor B
4. A only