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(a) State any three differences between the physical properties of metals and non-metals.(b) Differentiate between metals and non-metals on the basis of their chemical properties.
(c) State three reasons (of which at least one must be chemical) for believing that sodium is a metal.
(d) State three reasons (of which at least one must be chemical) for believing that sulphur is a non-metal.
(e) Which non-metal has been placed in the reactivity series of metals?
(a) Differences between metals and non-metals on the basis of their physical properties are given below:
- Metals are malleable whereas non-metals are non-malleable.
- Metals are ductile whereas non-metals are non-ductile
- Metals are good conductors of electricity whereas non-metals are bad conductors of electricity
(b) Differences between metals and non-metals on the basis of their chemical properties are given below:
- Metals form basic oxides whereas non-metals form acidic or neutral oxides.
- Metals displace hydrogen from water whereas non-metals form acidic or neutral oxides.
- Metal displace hydrogen from dilute acids whereas non-metals do not react with dilute acids.
(c) Sodium is found in solid-state. It conducts electricity and forms basic oxides. Therefore, Sodium is a metal.
(d) Sulphur is a brittle solid. It is a non-conductor of electricity and forms acidic oxides. Therefore, Sulphur is a non-metal.
(e) Hydrogen is the non-metal which is placed in the reactivity series of metals.
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