1
IIT-JEE 2011 Paper 2 Offline
+3
-0.75
Consider the following cell reaction:
2Fe(s) + O2(g) + 4H+(aq) $$\to$$ 2Fe2+ (aq) + 2H2O (l); Eo = 1.67 V
At [Fe2+] = 10-3 M, P(O2) = 0.1 atm and pH = 3, the cell potential at 25oC is
A
1.47 V
B
1.77 V
C
1.87 V
D
1.57 V
2
IIT-JEE 2011 Paper 2 Offline
MCQ (More than One Correct Answer)
+3
-0.75
For the first order reaction
2N2O5 (g) $$\to$$ 4NO2 (g) + O2 (g)
A
the concentration of the reactant decreases exponentially with time
B
the half-life of the reaction decreases with increasing temperature
C
the half-life of the reaction depends on the initial concentration of the reactant
D
the reaction proceeds to 99.6% completion in eight half-life duration
3
IIT-JEE 2011 Paper 2 Offline
+1
-0.25
Oxidation states of the metal in the minerals haematite and magnetite, respectively are
A
II, III in haematite and III in magnetite
B
II, III in haematite and II in magnetite
C
II in haematite and II, III in magnetite
D
III in haematite and II, III in magnetite
4
IIT-JEE 2011 Paper 2 Offline
Numerical
+4
-0
Let $$\omega = {e^{{{i\pi } \over 3}}}$$, and a, b, c, x, y, z be non-zero complex numbers such that
$$a + b + c = x$$
$$a + b\omega + c{\omega ^2} = y$$
$$a + b{\omega ^2} + c\omega = z$$

Then the value of $${{{{\left| x \right|}^2} + {{\left| y \right|}^2} + {{\left| z \right|}^2}} \over {{{\left| a \right|}^2} + {{\left| b \right|}^2} + {{\left| c \right|}^2}}}$$ is