Which of the following is dependent on temperature?

In the electrochemical cell :
$$Zn\left| {ZnS{O_4}\left( {0.01\,M} \right)} \right|$$$$\left| {CuS{O_4}\left( {1.0M} \right)} \right|Cu,$$
the emf of this Daniell cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO4 changed to 0.01 M, the emf changes to E₂. From the followings, which one is the relationship between E₁ and E₂? (Given, RT/F = 0.059)

Mechanism of a hypothetical reaction
X₂ + Y₂ $$ \to $$ 2XY, is given below :
(i)   X₂ $$ \to $$ X + X (fast)
(ii)  X + Y₂ $$\rightleftharpoons$$ XY + Y (slow)
(iii) X + Y $$ \to $$ XY (fast)
The overall order of the reaction will be

A first order reaction has a specific reaction rate of 10^$$-$$2 sec^$$-$$1. How much time will it take for 20 g of the reactant to reduce to 5 g?