1
AIEEE 2010
+4
-1
The time for half life period of a certain reaction A $$\to$$ products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0 mol L–1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L–1 if it is a zero order reaction ?
A
4 h
B
0.5 h
C
0.25 h
D
1 h
2
AIEEE 2009
+4
-1
The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2=0.301) :
A
230.3 minutes
B
23.03 minutes
C
46.06 minutes
D
460.6 minutes
3
AIEEE 2008
+4
-1
For a reaction $${1 \over 2}A \to 2B$$ rate of disappearance of ‘A’ is related to the rate of appearance of ‘B’ by the expression
A
$$- {{d[A]} \over {dt}}$$ = $${1 \over 2}{{d[B]} \over {dt}}$$
B
$$- {{d[A]} \over {dt}}$$ = $${1 \over 4}{{d[B]} \over {dt}}$$
C
$$- {{d[A]} \over {dt}}$$ = $${{d[B]} \over {dt}}$$
D
$$- {{d[A]} \over {dt}}$$ = $$4{{d[B]} \over {dt}}$$
4
AIEEE 2007
+4
-1
The energies of activation for forward and reverse reactions for A2 + B2 $$\leftrightharpoons$$ 2AB are 180 kJ mol−1 and 200 kJ mol−1 respectively. The presence of catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol−1. The enthalpy change of the reaction ( A2 + B2 $$\to$$ 2AB) in the presence of catalyst will be (in kJ mol−1)
A
300
B
120
C
200
D
20
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination