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16.The cell in which electrolysis takes place is named as electrolytic cell. Electrolysis is used to drive an oxidation-reduction reaction in a direction in which it does not occur spontaneously.
17.A metal is a material that, when fresh metal polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable (they can be hammered into thin sheets) or ductile (can be drawn into wires). A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polymeric sulfur nitride.
18.SI unit of calorific value is kJ/kg.
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