1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
A first order reaction has a specific reaction rate of 10$$-$$2 sec$$-$$1. How much time will it take for 20 g of the reactant to reduce to 5 g?
A
138.6 sec
B
346.5 sec
C
693.0 sec
D
238.6 sec
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the
A
rate is proportional to the surface coverage
B
rate is inversely proportional to the surface coverage
C
rate is independent of the surface coverage
D
rate of decomposition is very slow.
3
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
The rate of first-order reaction is 0.04 mol L$$-$$1 s$$-$$1 at 10 seconds and 0.03 mol L$$-$$1 s$$-$$1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is
A
44.1 s
B
54.1 s
C
24.1 s
D
34.1 s
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
The addition of a catalyst during a chemical reaction alters which of the following quantities?
A
Enthalpy
B
Activation energy
C
Entropy
D
Internal energy
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