The Effect of Temperature on the Rate of Reactions NEET Questions

Physical Chemistry - Chemical Kinetics
The Effect of Temperature on the Rate of Reactions

The Effect of Temperature on the Rate of Reactions MCQ Questions


7.
The plot of ln k versus 1/T according to the Arrhenius equation is:
A.
a parabola
B.
a straight line with positive slope
C.
a curve passing through origin
D.
a straight line with negative slope
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ANSWER :
D. a straight line with negative slope
8.
The slope of the straight line obtained by plotting ln k against 1/T is equal to:
A.
–Ea/R
B.
–Ea/2.303 R
C.
+Ea/R
D.
–R/Ea
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ANSWER :
A. –Ea/R
9.
The slope of the line obtained by plotting log k versus 1/T is:
A.
+Ea / (2.303 R)
B.
–2.303 R / Ea
C.
–Ea / R
D.
–Ea / (2.303 R)
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ANSWER :
D. –Ea / (2.303 R)
10.
The intercept of a plot of ln k versus 1/T (Arrhenius plot) is:
A.
ln Ea
B.
–Ea/R
C.
log A
D.
ln A
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ANSWER :
D. ln A
11.
The integrated form of the Arrhenius equation relating rate constants k1 and k2 at temperatures T1 and T2 is:
A.
log(k2/k1) = (Ea/2.303 R) · (T2 – T1)/(T1·T2)
B.
log(k2/k1) = (Ea/2.303 R) · (T1·T2)/(T2 – T1)
C.
log(k2/k1) = (R/2.303 Ea) · (T2 – T1)/(T1·T2)
D.
log(k2/k1) = (Ea/R) · (T2 – T1)
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ANSWER :
A. log(k2/k1) = (Ea/2.303 R) · (T2 – T1)/(T1·T2)
12.
The rate of a reaction doubles when its temperature changes from 300 K to 310 K. The activation energy of the reaction is approximately (R = 8.314 J K⁻¹ mol⁻¹):
A.
26.8 kJ mol⁻¹
B.
53.6 kJ mol⁻¹
C.
107 kJ mol⁻¹
D.
13.4 kJ mol⁻¹
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ANSWER :
B. 53.6 kJ mol⁻¹
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