The half-life of 2 samples are 0.1 and 0.4 seconds. Their respective concentration are 200 and 50 respectively. What is the order of the reaction

zero
2
1
4

Solution

In the first order reaction, the concentration of the reactant is reduced to 25% in one hour. The half life period of the reaction is

2 hr
4 hr
1/2 hr
1/4 hr

Solution

A first order reaction is half completed in 45 minutes. How long does it need 99.9% of the reaction to be completed

5 hours
7.5 hours
10 hours
20 hours

Solution

Solution

Which among the following plots are linear (a – x) is the concentration of reactant remaining after time, t
(1)(a – x) vs t, for a first order reaction
(2)(a – x) vs t, for a zero order reaction
(3)(a – x) vs t, for a second order reaction
(4)1/(a – x) vs t, for a second order reaction

1 and 2
1 and 3
2 and 3
2 and 4

A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will

remain unchanged
triple
increase by a factor of 4
double

Solution

\(-\frac{dx}{dt}\) ∝ [CO]² so on doubling the concentration of CO the rate of reaction will increase by 4 times.

For the reaction H₂(g) + Br₂ (g) ⟶ 2HBr (g), the experimental data suggest, rate = k[H₂][Br₂]^1/2. The molecularity and order of the reaction are respectively

2,\(-\frac{3}{2}\)
\(-\frac{3}{2}\) , \(-\frac{3}{2}\)
1,1
1, \(-\frac{1}{2}\)

Solution

The order of reaction is \(\frac{3}{2}\) and molecularity is 2.

Lead is the final product formed by a series of changes in which the rate determining stage is the radioactive decay of uranium-238 with a half-life of 4.5 × 10⁹ years. What would be the age of a rock sample originally lead free in which the molar proportion of uranium to lead is now 1 : 3?

1.5 × 10⁹ years
2.25 × 10⁹ years
4.5 × 10⁸ years
9.0 × 10⁹ years

Solution

Solution

The rate of reaction is doubled for every 10°C rise in temperature. The increase in reaction rate as a result of temperature rise from 10°C to 100°C is

Solution

As the rate of reaction get doubled for every 10°C rise in temperature. Hence the increase in reaction rate as a result of temperature rise from 10°C to 100°C is equal to = 2⁹ = 512

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