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Select the correct property which is not true for metals:
1. Metals are good conductors of electricity
2. Metals are malleable and ductile
3. Non-polar covalent compounds are formed from metals
4. Metals have 1, 2 or 3 valence electrons.

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Answer

Non-polar covalent compounds are formed from metals.

Reason

A non-polar covalent compound is formed when electrons are shared equally between two atoms and metals generally donate electrons and form bonds. Hence, they do not form non-polar covalent compounds

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Metallurgy

Give reasons for the following pertaining to Hall Herault’s process.
(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction.
(ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar.
(iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes.
(iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

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