Eamcet-chemistry Online Test

1.Which of the follwing is the study of rates of chemical process?


2.For a first order reaction at 27 C the ratio of time required for 50% completion to 25% completion of reaction is


3.For the reaction given below, what is the instantaneous rate for each of the reactants

and products?

3 A + 2 B --->?4 C


4.Given the following experimental data, find the rate law and the rate constant for the

reaction:

NO (g) + NO2 (g) + O2 (g) ---->? N2O5 (g)

Run [NO]o , M [NO2[o , M [O2]o ,M Initial Rate, Ms-1

1 0.10 M 0.10 M 0.10 M 2.1 x 10-2

2. 0.20 M 0.10 M 0.10 M 4.2 x 10-2

3 0.20 M 0.30 M 0.20 M 1.26 x 10-1

4. 0.10 M 0.10 M 0.20 M 2.1 x 10-2


5.The half-life of a radioisotope is found to be 4.55 minutes. If the decay follows first

order kinetics, what percentage of isotope will remain after 2.00 hours?


6.The mechanism of a reaction is shown below. the overall reaction is...

HOOH + I¯ ? HOI + OH¯ (slow)

HOI + I¯ ? I2 + OH¯ (fast)

2OH¯ + 2H3O+ ? 4 H2O (fast)


7.The mechanism of a reaction is shown below.

HOOH + I¯ ? HOI + OH¯ (slow)

HOI + I¯ ? I2 + OH¯

(fast)

2OH¯ + 2H3O+ ? 4 H2O

(fast)

the intermediates are:


8.The mechanism of a reaction is shown below. the order is

HOOH + I¯ ----->? HOI + OH¯ slow

HOI + I¯ ? ----> I2 + OH¯ fast

2OH¯ + 2H3O+ ----> ? 4 H2O fast


9.For the reaction A + B --->?C, the rate constant at 215 oC is 5.0 x 10-3 and the rate

constant at 452o C is 1.2 x 10-1.

a) What is the activation energy in kJ/mol?

b) What is the rate constant if extra moles of reactants are added


9. Slope of a graph drawn b/w k to reaction coordinate is


10.catalyst changes the speed of reacion by


11.The equilibrium constant for the given reaction is 100?

N2+ 2O2 --->2N02 then equilibrium constant for NO2 ---->(1/2)N2+O2


13.This reaction is completed in 100 minutes. The rate constant of this reaction at t1=10 min is 0.1 min-1. What is

the rate constant (in min-1) at t2 = 20 minutes?


14. For the Reaction A-> products rate is 10 at t1=10min then for the same reaction rate at t2=2min is


15.Type of catalyst used for preserving Urea are known as


16.Which of the following is not a characteristic property of chemical equilibrium?

[2006 E]

1. Rate of forward reaction is equal to rate of backward reaction at equilibrium

2. After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged

with time

3. For A---> products

If this reaction is carried out in the presence of a catalyst, the value of Kc .

decreases.

4. After reaching the equilibrium, both forward and backward reactions continue to take place


17.In Which of the following reactions, the concentration of reactant is equal to concentration of product at

equilibrium (K = equilibrium constant)


18.In each of the following equilibria, would you increase the temperature to force the reaction in the forward direction?

a. H2 (g) + CO2 (g) --->H2O(g) + CO(g) ?H° = +41.0 kJ

b. 2 SO2 (g) + O2 (g) ---> 2 SO3 (g) ?H° = -198 kJ


19.state which direction is favoured for the following

a) a--->b H=+2.3kJ

b)b---->c H=-0.9kJ

c) X---->Y H=-40kJ


20.For reaction below will the value for Keq increase or decrease if the temperature is raised?

H2 (g) + CO2 (g) H2O(g) + CO(g) ?H° = +41.0 kJ


21.For the following rection will the value for Keq increase or decrease if the temperature is raised?

2 SO2 (g) + O2 (g) 2 SO3 (g) ?H° = -198 kJ


22.The effect of using a platinum catalyst in the equilibrium reaction of ammonia with oxygen:

4 NH3 (g) + 5 O2 (g) 4 NO(g) + 6 H2O(g) + heat


23.Lechatlier states that


24.Rate of a reaction is influenced by


The value of Keq does not change when changes in

concentration cause a shift in equilibrium.


26.For the following system at equilibrium:

H2 (g) + I2 (g) ? 2 HI (g)

a.Predict the shift in equilibrium when more HI(g) is added to the system.

b.what happens to [I2]


The pressure on each of the following systems is increased by decreasing the volume of the container. Explain whether each system would shift in the forward direction, the reverse direction, or stay the same.

a. 2 SO2 (g) + O2 (g) 2 SO3 (g)

b. H2 (g) + I2 (g) 2 HI(g)

c. CaCO3 (s) CaO(s) + CO2 (g)

d. AgCl(s) Ag1+(aq) + Cl1-(aq)


28.In the presence of a catalyst---------------------- will not change


catalyst used in decomposition of ozone


substances that slows down the reaction












































































































Description:

eamcet chemistry
chemical equilibrium
chemical kinetics
for 30 marks time 40 mins
30 questions
20 from equilibrium,10 from kinetics
Chemical kinetics, also known as reaction kinetics, is the study of rates of chemical processes. Chemical kinetics includes investigations of how different experimental conditions can influence the speed of a chemical reaction and yield information about the reaction's mechanism and transition states, as well as the construction of mathematical models that can describe the characteristics of a chemical reaction

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