BITSAT Chemistry Practice Test for BITSAT 2011 Exam Preparation | BITSAT Hall Ticket | BITSAT Sample Papers | BITSAT Syllabus | BITS Pilani

Question

The activation energy of a chemical reaction can be determined by

Possible Answers

Selected	Possible Answer
	changing concentrations of reactants
	evaluating velocitiies of reaction at two different temperatures
	evaluating rate constant at standard temperature
	evaluating rate constants at two different temperatures

Question

The rate constant of a first order reaction, whose half-life is 480 seconds, is

Possible Answers

Selected	Possible Answer
	1.44 x $10 ^ {- 3} s ^ {- 1}$
	1.44 $s ^ {- 1}$
	0.72 x $10 ^ {- 3} s ^ {- 1}$
	2.88 x $10 ^ {- 3} s ^ {- 1}$

Question

For a chemical reaction, $A \rightarrow B,$ it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of the reaction with respect to A is

Possible Answers

Selected	Possible Answer
	1/2
	2
	1
	Zero

Question

For a certain first order reaction, $X \rightarrow Y + Z,$ the value of $t_{1/2}$ is 10 minutes. The concentration of X is reduced to 10% of the orginal concentration in

Possible Answers

Selected	Possible Answer
	70 min
	33 min
	90 min
	10 min

Question

The reaction H ^ +

$\rightarrow H_2 O$ is

Possible Answers

Selected	Possible Answer
	slow
	very slow
	fast
	moderate in speed

Question

The rate of a reaction depends upon the temperature and quatitatively expressed in the form of Arrhenius equation, $k = A.e ^ {\frac {E_a}{RT}}.$ The exponential term represents the fraction of molecules having energy to reach the transition state or cross the energy barrier. Pre-exponential factor gives the number of collisions per unit time. The data of two reactions is given below: (i) For the first reaction it is observed that 3.6 x $10 ^ {- 16}$ % reactant molecues exist in the activated state of a reaction at 300 K. (ii) At 25 ^ o

C, the

of the second reaction, $NO(g) + Cl_2(g) \rightarrow NOCl(g) + Cl(g)$ is 8.5 x $10 ^ 4 J mol ^ {- 1}.$ The fraction of collisions with sufficient energy is 1.2 x $10 ^ {- 15}.$

The activation energy of the first reaction is

Possible Answers

Selected	Possible Answer
	100 kJ
	200 kJ
	150 kJ
	250 kJ

Question

The rate of a reaction depends upon the temperature and quatitatively expressed in the form of Arrhenius equation, $k = A.e ^ {\frac {E_a}{RT}}.$ The exponential term represents the fraction of molecules having energy to reach the transition state or cross the energy barrier. Pre-exponential factor gives the number of collisions per unit time. The data of two reactions is given below: (i) For the first reaction it is observed that 3.6 x $10 ^ {- 16}$ % reactant molecues exist in the activated state of a reaction at 300 K. (ii) At

25 ^ o
 C, the

of the second reaction, $NO(g) + Cl_2(g) \rightarrow NOCl(g) + Cl(g)$ is 8.5 x $10 ^ 4 J mol ^ {- 1}.$ The fraction of collisions with sufficient energy is 1.2 x $10 ^ {- 15}.$

If a graph is plotted between k against 1/T, the intercept obtained is

Possible Answers

Selected	Possible Answer
	$\frac {- E_a}{2.303 R}$
	log 1/T
	log k
	log A

Question

The rate of a reaction depends upon the temperature and quatitatively expressed in the form of Arrhenius equation, $k = A.e ^ {\frac {E_a}{RT}}.$ The exponential term represents the fraction of molecules having energy to reach the transition state or cross the energy barrier. Pre-exponential factor gives the number of collisions per unit time. The data of two reactions is given below: (i) For the first reaction it is observed that 3.6 x $10 ^ {- 16}$ % reactant molecues exist in the activated state of a reaction at 300 K. (ii) At 25 ^ o

C, the

of the second reaction, $NO(g) + Cl_2(g) \rightarrow NOCl(g) + Cl(g)$ is 8.5 x $10 ^ 4 J mol ^ {- 1}.$ The fraction of collisions with sufficient energy is 1.2 x $10 ^ {- 15}.$

The dimensions of A will be

Possible Answers

Selected	Possible Answer
	$J mol ^ {- 1}$
	dimensionless
	mol/time
	$time ^ {- 1}$

Question

A chain reaction, once started. cannot be stopped till it is complete.

Possible Answers

Selected	Possible Answer
	False
	True

Question

The speed of any chemical reaction is directly proportional to the molar concentrations.

Possible Answers

Selected	Possible Answer
	False
	True

Question

In a rate equation, the powers to which the concentrations are raised cannot be determined by inspection of the balanced equation.

Possible Answers

Selected	Possible Answer
	True
	False

Question

In the following questions two statements are given one of the statement is labelled as ASSERTION and the ohter is REASON. Read the statement carefully and mark correct choice according to the following key:

(a) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(b) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(c) If ASEERTION is correct and REASON is wrong

(d) If ASSERTION is wrong and REASON is correct

ASSERTION : Half life period is always independent of initial concentrations.

REASON : Half life period is inversely proportional to rate constant.

Possible Answers

Selected	Possible Answer
	b
	c
	a
	d

Question

In the following questions two statements are given one of the statement is labelled as ASSERTION and the ohter is REASON. Read the statement carefully and mark correct choice according to the following key:

(a) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(b) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(c) If ASEERTION is correct and REASON is wrong

(d) If ASSERTION is wrong and REASON is correct

ASSERTION : A pseudo first order reaction occurs slowly.

REASON : Reactions of high order can follow kinetics of first order under special conditions.

Possible Answers

Selected	Possible Answer
	c
	b
	d
	a

Question

In the following questions two statements are given one of the statement is labelled as ASSERTION and the ohter is REASON. Read the statement carefully and mark correct choice according to the following key:

(a) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(b) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(c) If ASEERTION is correct and REASON is wrong

(d) If ASSERTION is wrong and REASON is correct

ASSERTION : The rate of reaction can also increase with its product if one of the products act as catalyst.

REASON : A catalyst lowers the activation energy of the reactions.

Possible Answers

Selected	Possible Answer
	d
	a
	c
	b

Question

In the following questions two statements are given one of the statement is labelled as ASSERTION and the ohter is REASON. Read the statement carefully and mark correct choice according to the following key:

(a) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(b) If both ASSERTION and REASON are correct and REASON is the correct explanation of ASSERTION

(c) If ASEERTION is correct and REASON is wrong

(d) If ASSERTION is wrong and REASON is correct

ASSERTION : The order of a reaction is related to molecularity.

REASON : Molecularity of the reaction cannot be fractional.

Possible Answers

Selected	Possible Answer
	c
	b
	a
	d

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