Chemical Kinetics Test

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Chemical Kinetics Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The half life periods of a reaction at initial concentration 0.1 mol/L and 0.5 mol/L are 200 s and 40 s respectively. The order of the reaction is

A
0

B
1

C
2

D
1/2

Solution

As initial concentration is increased half life is decreasing so order of reaction is 2.
for second order reaction, rate α 1/[R]
Question 2
1 / -0

Which among the following is an instantaneous reaction?

A
Hydrolysis of starch

B
Precipitation of silver chloride.

C
Burning of a log of wood

D
Rusting of iron

Solution

Mixing of silver nitrate and sodium chloride involves ionic reaction to form precipitates of silver chloride.
AgNO₃(aq) + NaCl(aq) → AgCl(s) + NaNO₃(aq)
Since ionic reactions are very fast, so it is an instantaneous reaction.
Question 3
1 / -0

The half life of a reaction is halved as the initial concentration of the reactant is doubled. The order of the reaction is

A
3

B
0

C
1

D
2

Solution

For second order reaction, half life is inversely related to concentration of reactant.
t_½ for second order reaction α 1/[R]
Question 4
1 / -0

The substance that slows down the reaction without being consumed is known as

A
Positive catalyst

B
Inhibitors

C
Catalysis

D
Hormones

Solution

Inhibitors inhibits the action of catalyst and hence slows down the rate of reaction.
Question 5
1 / -0

Activation energy of a reaction is

A
The energy absorbed during a reaction

B
Energy evolved when activated complex is formed

C
The energy released during the reaction

D
The minimum amount of energy required to overcome the barrier

Solution

The minimum extra amount of energy required by the reactants to form the activated complex is known as activation energy.
Activation energy = Threshold energy - normal energy of reactant.
Question 6
1 / -0

The rate law for the reaction is given by rate= k[RCl]. The rate for this reaction

A
is doubled by doubling the concentration of NaOH

B
is halved by doubling the concentration of NaOH

C
is unaffected by change in temperature

D
is halved by half by reducing the concentration of RCl

Solution

since rate of reaction = k[RCl]¹
so if conc. of RCl is halfed the rate of reaction will also become half.
Question 7
1 / -0

For an endothermic reaction where Δ H represents the enthalpy of the reaction in kJ/mol . The minimum value for the energy of activation will be

A
Equal to ΔH

B
More than ΔH

C
Zero

D
Less than ΔH

Solution

△H = +ve for endothermic reaction
, therefore, E_a > ΔH
Question 8
1 / -0

Order of the photochemical reaction occurring between hydrogen and chlorine is

A
Zero order

B
First order

C
Second order

D
Third order

Solution

light dependent Photochemical reaction between H₂ and Cl₂ is 0 zero w.r.t. to reactants.
Question 9
1 / -0

The temperature coefficient of most of the reactions lies between

A
1 and 4

B
2 and 4

C
2 and 3

D
1 and 3

Solution

For every 10^∘ rise in temperature rate of reaction increases by factor of 2 or 3.

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Re-Attempt Weekly Quiz Competition

Chemical Kinetics Test - 8

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Chemical Kinetics Test - 8

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Question 1

0

1

2

1/2

Solution

Question 2

Hydrolysis of starch

Precipitation of silver chloride.

Burning of a log of wood

Rusting of iron

Solution

Question 3

3

0

1

2

Solution

Question 4

Positive catalyst

Inhibitors

Catalysis

Hormones

Solution

Question 5

The energy absorbed during a reaction

Energy evolved when activated complex is formed

The energy released during the reaction

The minimum amount of energy required to overcome the barrier

Solution

Question 6

is doubled by doubling the concentration of NaOH

is halved by doubling the concentration of NaOH

is unaffected by change in temperature

is halved by half by reducing the concentration of RCl

Solution

Question 7

Equal to ΔH

More than ΔH

Zero

Less than ΔH

Solution

Question 8

Zero order

First order

Second order

Third order

Solution

Question 9

1 and 4

2 and 4

2 and 3

1 and 3

Solution

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