Chemical Engineering Basics
The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

T
1/T²
1/T

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Chemical Engineering Basics
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

Increasing the surface area of the electrodes
Increasing the concentration of copper sulphate solution
Increasing the concentration of zinc sulphate solution
Decreasing the surface area of the electrodes

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