Tamil Nadu Public Service Commission Scientific Assistant Chemistry 2010 Paper
A graph between time t and substance consumed at any time (x) is found to be a straight line through the origin. This indicates that reaction is of
(a) first order
(b) zero order
(c) third order
(d) second order
What is the half-life of radioactive substance if 75% of any given amount of the substance distintegrates in 60 minutes ?
(a) 2 hours
(b) 30 minutes
(c) 45 minutes
(d) 20 minutes
The influence of temperature on reaction rate is predicted by
(a) Van der Waals equation
(b) Kirchhoffs equation
(c) Arrhenius equation
(d) Lewis equation
The enzyme catalysed reaction is faster than metal catalysed reaction because its activation energy is _________ that of metal catalysed reaction.
(a) greater than
(b) lower than
(c) same as
(d) none of these
The cooling in refrigerator is due to
(a) the work of compressor
(b) the expansion of gas in the refrigerator
(c) expnsion of ice
(d) reaction of the refrigerator gas
In an exothermic reaction, high yield is produced at
(a) high temperature
(b) low temperature
(c) low concentration
(d) none of these
The Minimum energy required for an effective collision is
(a) threshold energy
(b) activation energy
(c) free energy
(d) internal energy
A large increase in the rate of reaction for a rise in temperature is due to
(a) increase in number of collisions
(b) increase in number of activated molecules
(c) lowering of activation energy
(d) shortening of mean free path
The half-life of a first order reaction is
(a) independent of initial concentration
(b) directly proportional to initial concentration
(c) inversely proportional to initial concentration
(d) None of these
Entropy of the univrse is always
(a) decreasing
(b) zero
(c) constant
(d) increasing
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