7. Write one example for each of the following: (a) A non- metal with best conductor of heat and a non –metal with poorest conductor of heat. (b) A metal with dull lustre and a non-metal with lustre (c) A metal in liquid state and a non-metal in solid state
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Solid non-metals are soft and dull. They break down into a powdery mass on tapping with a hammer. For example, coal and sulphur.
• Non-metals are not sonorous.
• They are poor conductors of heat and electricity.
• They do not possess metallic lusture.
• They possess no malleability and ductility.
Examples of non-metals: phosphorus, sulphur, carbon, oxygen etc.
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Answer:ANS: a] Graphite is good conductor of heat and lead is the poorest conductor of heat
c] mercury is he liquid metal and bromine is non metal in liquid state.
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