1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
For a first order reaction, (A) $$\to$$ products, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is :
A
1.73 x 10–5 M/ min
B
3.47 x 10–4 M/min
C
3.47 x 10–5 M/min
D
1.73 x 10–4 M/min
2
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
The rate of a chemical reaction doubles for every 10oC rise of temperature. If the temperature is raised by 50oC , the rate of the reaction increases by about :
A
24 times
B
32 times
C
64 times
D
10 times
3
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1

Consider the reaction :

Cl2(aq) + H2S(aq) → S(s) + 2H+ (aq) + 2Cl (aq)

The rate equation for this reaction is rate = k [Cl2] [H2S]

Which of these mechanisms is/are consistent with this rate equation?

(A) Cl2 + H2S $$\to$$ H+ + Cl + Cl+ + HS (slow)

Cl+ + HS $$\to$$ H+ + Cl + S (fast)

(B) H2S $$\Leftrightarrow$$ H+ + HS (fast equilibrium)

Cl2 + HS $$\to$$ 2Cl + H+ + S (slow)

A
B only
B
Both A and B
C
Neither A nor B
D
A only
4
AIEEE 2010
MCQ (Single Correct Answer)
+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
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