Chemical Engineering Basics
In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

Rain of molten lead
Blast of air
Jet of water at high pressure
Mixture of water and air

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

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

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