The decomposition of ammonia on a platinum surface is a zero-order reaction. If the rate constant is 4 × 10 - 3 Mol . L - 1 . s - 1 , how long will it take to reduce the initial concentration of ammonia from 0 . 1 M to 0 . 064 M .

We have given, Decomposition of ammonia is a zero-order reaction. Initial concentration, R 0 = 0 . 1 M Final concentration, R t = 0 . 064 M Then time, t = ? From the expression for a zero-order rate constant, required time t = [ R ] ∘ − [ R ] t k Substituting the given values, t = [ 0 . 1 − 0 . 064 ] 4 × 10 - 3 = 0 . 936 4 × 10 - 3 t = 234 secs So, the time taken to reduce the initial concentration of ammonia from 0 . 1 M to 0 . 064 M = 234 sec

The given graph is a representation of kinetics of a reaction. The y and x axes for zero and first order reactions, respectively are

zero order ( y = rate and x = concentration), first order ( y = t 1 2 and x = concentration)

zero order ( y = concentration and x = time), first order ( y = rate constant and x = concentration)

zero order ( y = rate and x = concentration), first order ( y = rate and x = t 1 2

zero order ( y = concentration and x = time), first order ( y = t 1 2 and x = concentration)

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For, a zero-order reaction, the plot of concentration of reactant versus rate is linear with negative slope and zero intercept.

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Important Questions on Chemical Kinetics (AHL)

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Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Derive an expression of rate constant for zero order reaction.

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Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Which expression among the following is correct for a zero-order reaction and a first order reaction respectively? Here

' a'

denotes the intial concentration of reactant:

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Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Starting from the integrated law of a zero-order reaction,

R \to P

, show that the half-life time of a reaction is directly proportional to the initial molar concentration of the reactant.

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Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

For a first-order reaction, prove that

t_{99.9 %} = 10 t_{1 / 2}

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Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

For a zero - order reaction with rate constant k, the slope of the plot reactant concentration against time is

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Write the mathematical relation between half life of zero order reaction and its rate constant.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

The decomposition of ammonia on a platinum surface is a zero-order reaction. If the rate constant is

4 \times 10^{- 3} Mol . L^{- 1} . s^{- 1}

, how long will it take to reduce the initial concentration of ammonia from

0.1 M to 0.064 M

HARD

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Draw the graph of half-life period

(t_{\frac{1}{2}})

versus initial concentration of reactant

({[a]}_{0})

for a zero order reaction. Give reasons in favour of your answer.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

In a zero order reaction, when

dx / dt

is plotted against

(a - x)

is obtained.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Rate constant for zero order reaction is

2 \times 10^{- 2} mol L^{- 1} s^{- 1},

if the concentration of the reactant after

25 \sec .

0.5 M .

What is the initial concentration of reactant?

HARD

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Which of the following relation is correct for zero-order reaction?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

The half-life for a zero order reaction having

0.02 M

initial concentration of reactant is

100 s

. The rate constant (in

mol L^{- 1} s^{- 1}

) for the reaction is

HARD

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Examine the graph given below. Identify the integrated rate equation and the order of the reaction corresponding to it.

Question Image

HARD

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Determine the expression of rate constant for zero order reaction.

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

The half-life of a zero order reaction is

x

second. If the reaction takes

t_{1}

second to complete, calculate

t_{1}

in terms of

x

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

The given graph is a representation of kinetics of a reaction.

Question Image

The $y$ and $x$ axes for zero and first order reactions, respectively are

HARD

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Derive the integrated rate equation of Zero Order Reaction.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

For zero order reaction, a plot of

t_{1 / 2}

versus

[A]_{0}

will be

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

Under the same reaction conditions, initial concentration of

1.386 mol {dm}^{- 3}

of a substance becomes half in

40 s

and

20 s

through first order and zero order kinetics, respectively. Ratio

(\frac{k_{1}}{k_{0}})

of the rate of constants for first order

(k_{1})

and zero order

(k_{0})

of the reaction is

EASY

Chemistry>Physical Chemistry>Chemical Kinetics (AHL)>Rate Equation

The rate constant of the reaction

A ⟶ B

0.6 \times 10^{- 3}

mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minutes is:

For, a zero-order reaction, the plot of concentration of reactant versus rate is linear with negative slope and zero intercept.

Important Questions on Chemical Kinetics (AHL)

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