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

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Chemical Engineering Basics
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

Counter flow with unequal heat capacities
Parallel flow with equal heat capacities
Counter flow with equal heat capacities
Parallel flow with unequal heat capacities

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