Chemical Kinetics Test

Result

Chemical Kinetics Test - 76

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Weekly Quiz Competition

Question 1
1 / -0

The order of a reaction and rate constant for a chemical change having following curve would be:

A
0, 1/2

B
1, 1

C
2, 2

D
0, 1
Question 2
1 / -0

For a first order reaction, the value of rate constant for the reaction

$$A_{(gas)}\longrightarrow 2B_{(gas)}+C_{(solid)}$$

A
$$\dfrac{1}{t}ln\left( \frac { { P }_{ 0 } }{ { P }_{ 0 }-{ P }_{ 1 } } \right) $$

B
$$\dfrac{1}{t}ln\left( \frac { { P }_{ 0 } }{ { 2P }_{ 0 }-{ P }_{ 1 } } \right) $$

C
$$\dfrac{1}{t}ln\left( \frac { { 2P }_{ 0 } }{ { 3P }_{ 0 }-{ P }_{ 1 } } \right) $$

D
$$\dfrac{1}{t}ln\left( \frac { { P }_{ 0 } }{ { 3P }_{ 0 }-{ P }_{ 1 } } \right) $$
Question 3
1 / -0

$$75\%$$ of a zero order reaction complete in 4 hr and $$87.5\%$$ of the same reaction completes in

A
$$6 h$$

B
$$4.64 h$$

C
$$8 h$$

D
$$2 h$$

Solution
Question 4
1 / -0

For a zero order reaction $$ \mathrm{t}_{1 / 2} $$ is :

A
$$
\frac{[\mathrm{A}]_{0}}{\mathrm{K}}
$$

B
$$
\frac{2[\mathrm{A}]_{0}}{\mathrm{K}}
$$

C
$$
\frac{[\mathrm{A}]_{0}}{2 \mathrm{K}}
$$

D
$$
\frac{1}{[\mathrm{A}]_{0} \mathrm{K}}
$$
Question 5
1 / -0

Which of the following represents threshold energy:

A
Activation energy + energy of the reactant

B
Activation energy - energy of the reactant

C
Activation energy

D
Energy of the reactants
Question 6
1 / -0

For a given reaction of first order it takes 20 minutes for the concentration to drop from 1 M to 0.6 M. The time required for the concentration to drop from 0.6 M to 0.36 M will be:

A
More than 20 min

B
Less than 20 min

C
Equal to 20 min

D
Infinity
Question 7
1 / -0

Consider the given plot of enthalpy of the following reaction between $$A$$ and $$B$$.
$$A + B\rightarrow C + D$$
Identify the incorrect statement.

A
$$C$$ is the thermodynamically stable product

B
Formation of $$A$$ and $$B$$ from $$C$$ has highest enthalpy of activation

C
$$D$$ is kinetically stable product

D
Activation enthalpy of form $$C$$ is $$5\ kJ\ mol^{-1}$$ less than that to form $$D$$

Solution

$$A + B\rightarrow C + D$$

Activation enthalpy for $$C = 20 - 5 = 15\ kJ/mol$$

Activation enthalpy for $$D = 15 - 5 = 10\ kJ/ mol$$.
Question 8
1 / -0

A reagent undergoes $$90 \% $$ decomposition in 366 min. according to the first-order reaction. Its half-life is :-

A
$$
366 \times 100\left(\dfrac{\ln 2}{90}\right)
$$

B
$$
366\left(\dfrac{\ln 2}{\ln 10}\right)
$$

C
$$
\dfrac{1}{366}
$$

D
183

Solution
Question 9
1 / -0

Which of the following graph(s) are correct for zero order reactions?

A

B

C

D
All of the above

Solution
Question 10
1 / -0

Which among the following reaction is an example of a zero order reaction?

A
$$C_{12}H_{22}O_{11(aq)}+H_2O_{(l)}$$ $$\rightarrow C_6H_{12}O_{6(aq)}+C_6H_{12}O_{6(aq)}$$

B
$$2NH_{3(g)}\overset{Pt}{\rightarrow}N_{2(g)}+3H_{2(g)}$$

C
$$2H_2O_{2(l)}\rightarrow 2H_2O_{(l)}+O_{2(g)}$$

D
$$H_{2(g)}+I_{2(g)}\rightarrow 2HI_{(g)}$$

Solution

The decomposition of ammonia $$(NH_3)$$ on the surface of $$Pt$$ is zero-order reaction.

Here, Rate of reaction $$r=k[NH_3]^0$$

Here, $$Pt$$ metal will act as a catalyst.

Hence, option $$B$$ is correct.