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Introduction to Metallurgy

Which one of ...

Question

Which one of the following is not true of metals:
(a) Metals are good conductors of electricity.
(b) Metals are malleable and ductile.
(c) Metals form non-polar covalent compounds.
(d) Metal will have 1 or 2 or 3 electrons in their valence shell.

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Solution

(c) Metals form non-polar covalent compounds.
Metals are electropositive in nature and form ionic compounds.

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Q. Which of the following is true for all metals?
(a) They are hard solids.
(b) They have high melting and boiling points.
(c) They have 1−3 valence electrons.
(d) They are malleable and ductile.

Q. The property/properties which enable copper metal to be used for making electric wires is / are :
(a) copper metal is malleable and ductile
(b) copper metal is a good conductor of electricity
(c) copper metal is ductile and has low electrical resistance
(d) copper metal is sonorous and an excellent conductor of electricity

Metals are malleable but not ductile. State true or false.

Q. Question 30
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous; non-sonorous; non-malleable and are coloured.
(a) Name a lustrous non-metal.
(b) Name a non-metal which exists as a liquid at room temperature.
(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
(d) Name a non-metal which is known to form the largest number of compounds.
(e) Name a non-metal other than carbon which shows allotropy.
(f) Name a non-metal which is required for combustion.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

The allotropic form of a non-metal, which is a good conductor of electricity is:

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