SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Metals and nonmetals are both good conductors of heat and electricity
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metals and nonmetals are both poor conductors of heat and electricity
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metals are good conductors of heat and electricity while nonmetals are not
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metals Are dull and nonmetals are shiny
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Metals are shiny and nonmetals are dull
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Detailed explanation-1: -Metals are lustrous while non-metals are dull, metals are good conductor of heat and electricity while non-metals are bad, malleable and ductile nature shown by metals while non-metals are soft.
Detailed explanation-2: -Non-metals vary greatly in appearance. They do not have lustre. As it does not have any free electrons light falling on non-metals does not reflect and hence non-metals are not shiny. Hence, they have a very dull appearance.
Detailed explanation-3: -Metals reflect light-they are shiny, not dull. Metals conduct both heat and electricity well. Metals have a high melting and boiling point and are solids at room temperature (except mercury).
Detailed explanation-4: -Non-metals can be gases, liquids or solids. Non-metals are dull in colour, not shiny like metals.
Detailed explanation-5: -Metals appears to be dull when they kept open on air for a long time it forms a thin layer of oxide, carbonate or sulphide on their surface by the slow action of various gases. Brightness can be restored by rubbing the dull surface with a sand paper then outer layer is removed and metal object become shiny.