A radioactive element gets spilled over the floor of a room.Its half-life period is 30 days. If the initial velocity is ten times the permissible value,after how many days will it be safe to enter the room?

100 days
1000 days
300 days
10 days

Solution

Solution

The rate constants k₁ and k₂ for two different reactions are 10¹⁶. e^–2000/T and 10¹⁵. e^–1000/T, respectively. The temperature at which k₁ = k₂ is

1000 K
\(\frac{2000}{2.303}k\)
2000k
\(\frac{1000}{2.303}k\)

Solution

If 60% of a first order reaction was completed in 60 minutes,50% of the same reaction would be completed in approximately

45 minutes
60 minutes
40 minutes
50 minutes

Solution

For the following reaction: NO₂(g) +CO(g) ⟶ NO(g) +CO₂(g), the rate law is: Rate = k [NO₂]². If 0.1 mole of gaseous carbon monoxide is added at constant temperature to the reaction mixture which of the following statements is true?

Both k and the reaction rate remain the same
Both k and the reaction rate increase
Both k and the reaction rate decrease
Only k increases, the reaction rate remain the same

Solution

k remains constant at constant temperature and CO does not effect the rate of reaction.

The activation energy for a reaction is 9.0 k cal/mol. The increase in the rate constant when its temperature is increased from 298 K to 308 K is

63%
50%
100%
10%

Solution

The rate constant, the activation energy and the arrhenius parameter of a chemical reaction at 25°C are 3.0 × 10^-4 s^-1,104.4 kJ mol^-1 and 6.0 ×10¹⁴ s^-1 respectively. The value of the rate constant as T ⟶ ∞ is

2.0 × 10¹⁸ s^-1
6.0 × 10¹⁴ s^-1
Infinity
3.6 × 10³⁰ s^-1

Solution

The rate constant is doubled when temperature increases from 27°C to 37°C. Activation energy in kJ is

Solution

Cyclopropane rearranges to form propene
\(\Delta \rightarrow CH_{3} – CH = CH_{2}\) This follows first order kinetics. The rate constant is 2.714 × 10^–3 sec^–1. The initial concentration of cyclopropane is 0.29 M. What will be the concentration of cyclopropane after 100 sec

0.035 M
0.22 M
0.145 M
0.0018M

Solution

The rate constant of a first order reaction is doubled when the temperature is increased from 20°C to 25°C. How many times the rate constant will increase if the temperature is raised from 20°C to 40°C ?

Solution

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