1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
In a cell that utilises the reaction Zn(s) + 2H+ (aq) $$\to$$ Zn2+(aq) + H2(g) addition of H2SO4 to cathode compartment, will
A
lower the E and shift equilibrium to the left
B
increases the E and shift equilibrium to the left
C
increase the E and shift equilibrium to the right
D
Lower the E and shift equilibrium to the right
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The $$E_{{M^{3 + }}/{M^{2 + }}}^o$$ values for Cr, Mn, Fe and Co are – 0.41, +1.57, + 0.77 and +1.97 V respectively. For which one of these metals the change in oxidation state form +2 to +3 is easiest?
A
Fe
B
Mn
C
Cr
D
Co
3
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is
A
30 minutes
B
60 minutes
C
7.5 minutes
D
15 minutes
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The rate equation for the reaction 2A + B $$\to$$ C is found to be: rate k[A][B]. The correct statement in relation to this reaction is that the
A
unit of K must be s-1
B
values of k is independent of the initial concentration of A and B
C
rate of formation of C is twice the rate of disappearance of A
D
t1/2 is a constant
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