Chemistry Test 97

Result

Chemistry Test 97

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Weekly Quiz Competition

Question 1
4 / -1

In the reaction, A + 2B → 6C + 2D, if the initial rate at t = 0 is 2.6 × 10^–2 M s^–1, what will be the value of at t = 0?

A
8.5 × 10^–2 M s^–1

B
2.5 × 10^–2 M s^–1

C
5.2 × 10^–2 M s^–1

D
7.5 × 10^–2 M s^–1
Question 2
4 / -1

For a reaction X → Y, the rate of raction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction ?

A
2

B
1

C
3

D
0
Question 3
4 / -1

For a hypothetical reaction aA + bB → Product, the rate law is, rate (r) = K[A]^x[B]^y
then which of the following relation is possible–

A
a + b = x + y

B
a + b > x + y

C
a + b < x + y

D
All of the above
Question 4
4 / -1

For the chemical reaction :
A → Product
it is found that the rate of reaction increases by a factor of 6.25 when the concentration of A is increased by a factor of 2.5. The order of this reaction with respect to A is :

A
2.5

B
2

C
1

D
0.5
Question 5
4 / -1

Consider the zero order reaction A → B. Starting with 4 moles of A in a one litre container after half an hour only one mole of A is left unreacted. The value of rate constant K for the reaction is :-

A
0.4 mol lit^–1 min^–1

B
0.1 mol lit^–1 min^–1

C
1 mol lit^–1 min^–1

D
0.3 mol lit^–1 min^–1
Question 6
4 / -1

Which graph represents first order kinetics ?

A

B

C

D
Question 7
4 / -1

A reaction where temperature is increased from 10°C to 50°C then increase in rate of reaction will be:-

A
16 times

B
32 times

C
8 times

D
512 times

Solution
Question 8
4 / -1

A first order reaction has a specific reaction rate of 10^–2 s^–1. How much time will it take for 20 g of the reactant to reduce to 5g ?

A
138.6 s

B
346.5 s

C
693.0 s

D
238.6 s

Solution
Question 9
4 / -1

The rate constant for the reaction

2N₂O₅ → 4NO₂ + O₂ is 3 × 10^–5 sec^–1.

If the rate is 2.40 × 10^–5 mol litre^–1 sec^–1. Then the concentration of N₂O₅ (in mol litre^–1) is :-

A
1.4

B
1.2

C
0.04

D
0.8

Solution

Rate = k[N₂O₅]
2.4 × 10^–5 = 3 × 10^–5 × [N₂O₅]
Question 10
4 / -1

A hypothetical reaction A₂ + B₂ → 2AB follow the mechanism as given below

A₂ ⇌ A + A ( fast)
A + B₂ → AB + B (slow)
A + B → AB (fast)

The order of the over all reaction by rate determining step method is:-

A
2

B
1

C
3/2

D
0

Solution