1
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
The correct order of $$E_{{M^{2 + }}/M}^o$$ values with negative sign for the four successive elements Cr, Mn, Fe and Co is :
A
Mn > Cr > Fe > Co
B
Cr > Fe > Mn > Co
C
Fe > Mn > Cr > Co
D
Cr > Mn > Fe > Co
2
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
The Gibbs energy for the decomposition of Al2O3 at 500oC is as follows :

$${2 \over 3}A{l_2}{O_3}$$ $$\to$$ $${4 \over 3}Al + {O_2}$$, $${\Delta _r}G$$ = + 966 kJ mol–1

The potential difference needed for electrolytic reduction of Al2O3 at 500oC is at least :
A
4.5 V
B
3.0 V
C
2.5 V
D
5.0 V
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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