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 2010
MCQ (Single Correct Answer)
+4
-1
29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is
A
59.0
B
47.4
C
23.7
D
29.5
4
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
Which one of the following has an optical isomer ?
(en = ethylenediamine)
A
[Zn (en) (NH3)2]2+
B
[Co (en)3]3+
C
[Co (H2O)4 en]3+
D
[Zn (en)2]2+
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