This BITSAT chemistry test consists of chemical kinetics questions which are part of the BITSAT chemistry section. After BITSAT 2011 exam, students can check BITSAT cutoff and then decide their engineering college.
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The activation energy of a chemical reaction can be determined by
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
The rate constant of a first order reaction, whose half-life is 480 seconds, is
1/2
2
1
Zero
70 min
33 min
90 min
10 min
slow
very slow
fast
moderate in speed
The activation energy of the first reaction is
100 kJ
200 kJ
150 kJ
250 kJ
If a graph is plotted between k against 1/T, the intercept obtained is
log 1/T
log k
log A
The dimensions of A will be
dimensionless
mol/time
A chain reaction, once started. cannot be stopped till it is complete.
False
True
The speed of any chemical reaction is directly proportional to the molar concentrations.
In a rate equation, the powers to which the concentrations are raised cannot be determined by inspection of the balanced equation.
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.
b
c
a
d
ASSERTION : A pseudo first order reaction occurs slowly.
REASON : Reactions of high order can follow kinetics of first order under special conditions.
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.
ASSERTION : The order of a reaction is related to molecularity.
REASON : Molecularity of the reaction cannot be fractional.
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