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21.

If the time required to change the concentration of reactant to half its original value is independent of the initial concentration the order of reaction is

A.	zero	B.	one
C.	two	D.	three

22.

The rate constant for a first-order reaction

A.	depends on the unit of time	B.	has units of reciprocal time
C.	does not change on changing the concentration units	D.	all of the above

23.

The rate at which a chemical substance reacts is proportional to its

A.	equivalent weight	B.	atomic weight
C.	molecular weight	D.	active mass

24.

Equilibrium state is

A.	dynamic	B.	static
C.	neither dynamic nor static	D.	sometimes static and sometimes dynamic

25.

At equilibrium

A.	the rate of forward reaction is equal to the rate of backward reaction	B.	the rate of forward reaction is more than the rate of backward reaction
C.	the rate of forward reaction is less than the rate of backward reaction	D.	chemical reaction stops

26.

The rate of reaction of any component is a function of

A.	temperature of the system only	B.	pressure of the system only
C.	composition of the component only	D.	temperature pressure and composition

27.

The rate constant of a reaction depends on

A.	the temperature of the system	B.	the time of reaction
C.	the extent of reaction	D.	the initial concentration of the reactants

28.

Which of the following statements in incorrect?

A.	A rise in temperature usually tends to reduce the reaction rate	B.	A rise in temperature usually increases reaction rates
C.	A rise in temperature does not affect photo-chemical reaction rates	D.	A rise in temperature has no effect on catalysed reaction.

29.

Liquid A decomposes by irreversible first-order kinetics and the half-life period of this reaction is 12 min. The time required for 75% conversion of A is

A.	21 min	B.	16 min
C.	24 min	D.	18 min

30.

For the chemical reaction 3A + B ? C, the rate of formation of C is 0.30 mole/(1 hr). The rate of disappearance of A is

A.	0.30 mole / (1 hr)	B.	0.90 mole / (I hr)
C.	0.10 mole / (I hr)	D.	?0.30 mole / (I hr)