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41.

The half-line period of a first-order reaction (t1/2) and the rate constant (k) are related by

A.	t1/2 = k	B.	t1/2 = 2.303/k
C.	t1/2 = 0.693/k	D.	t1/2 = 7.67/k

42.

A certain first-order reaction is half completed in 23 minutes. The rate constant for the reaction must be

A.	0.030 s-1	B.	0.030 min-1
C.	0.030 hr-1	D.	0.10 min-1

43.

The rate constant for N2O5 decomposition reaction is found to be 6.2 x 10-4 S-1. The time required for one-half the N2O5 in a sample to be decomposed is

A.	6.2 x 104 s	B.	3710 s
C.	1513 s	D.	1120 s.

44.

A certain reaction has arate expression -rA = 0.001 CA2, mol/cm3 min. If the concentration is to be expressed in mol/lit. and time in hours. The value of the rate constant would be

A.	0.60 hr-1 (mol/l)-1	B.	0.001 hr-1 (mol/l)-1
C.	60.000 hr-1 (mol/l)-1	D.	0.06 hr-1 (mol/l)-1

45.

The integral method of analyzing kinetic data

A.	is easy to use and is recommended when testing specific mechanisms, or relatively simple rate expression	B.	is used when the ata are scattered
C.	assumes a particular form of rate equation	D.	all of these answers.

46.

A reaction is of zero order when the rate of reaction is

A.	proportional to the concentration of reactant	B.	inversely proportional to the concentration of reactant
C.	independent of the concentration of reactant	D.	independent of temperature.

47.

A reaction in which one of the products of reaction acts as a catalyst is called

A.	a catalytic reaction	B.	a photochemical reaction
C.	an autocatalytic reaction	D.	a biochemical reaction.

48.

The irreversible reaction is simply the special case of the reversible reaction if

A.	The concentration of the reactant at equilibrium conditions is zero	B.	the fractional conversion of the reactant at equilibrium conditions is zero
C.	the equilibrium constant is zero	D.	the equilibrium constant is one

49.

For the irreversible unimolecular-type first-order reaction

A.	the fractional conversion at any time is same for constant volume systems and variable-volume systems	B.	the fraction conversion at any time is more for constant volume systems than variable-volume systems
C.	the fractional conversion at any time is less for constant-volume systems than variable-volume systems	D.	the concentration of reactant at any time is same for constant-volume systems and variable-volume systems.

50.

For the isothermal gas-phase reaction A ? 3B, the fractional change in volume of the system between no conversion and complete conversion is

A.	1	B.	3
C.	2	D.	2?3