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Chemical Kinetics Chemistry - Chemical Kinetics

Maharashtra Board - STD 12 Science - Chemistry (MSBSHSE - English Medium). 40 questions in this chapter.

Question types

Chemical Kinetics question types

40 questions across 4 question groups — pick any mix to generate a Chemistry paper with step-by-step answer keys.

40
Questions
4
Question groups
5
Question types
Sample Questions

Chemical Kinetics questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 5Answer the following in one or two sentence.2 Marks
The reaction $A + B \longrightarrow$ products is first order in each of the reactants.
(a) How does the rate of reaction change if the concentration of $A$ is increased by factor 3 ?
(b) What is the change in the rate of reaction if the concentration of $A$ is halved and concentration of $B$ is doubled?
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Q 6Answer the following in brief.3 Marks
Ammonia and oxygen react at high temperature as:
$
4 NH _{3( g )}+5 O _{2( g )} \longrightarrow 4 NO _{( g )}+6 H _2 O _{( g )}
$
In an experiment, rate of formation of $NO _{( g )}$ is $3.6 \times 10^{-3} mol L ^{-1} \cdot s ^{-1}$
Calculate: (a) Rate of disappearance of ammonia. (b) Rate of formation of water.
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Q 7Answer the following in brief.3 Marks
Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law.
The half life of the reaction is $3$ hours. Calculate fraction of sucrose which will remain after $8$ hours.
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Q 8Answer the following in brief.3 Marks
Define activation energy. Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from $30^\circ C$ to $50^\circ C. ($Given $R = 8.314 JK^{-1} \ mol^{-1}).$
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