1
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
2
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
3
AIEEE 2009
MCQ (Single Correct Answer)
+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
4
AIEEE 2008
MCQ (Single Correct Answer)
+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
$$ - {{d[A]} \over {dt}}$$ = $$4{{d[B]} \over {dt}}$$
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