Consider the following statements about non-metals and select the correct option. Statement I: A solid substance that is dull, brittle, and does not conduct electricity in the solid state is most likely a non-metal. Statement II: All non-metals are dull, brittle solids and do not conduct electricity in the solid state.
Statement I is correct, but Statement II is incorrect
Statement I gives a diagnostic clue: a solid that is dull, brittle, and does not conduct electricity in the solid state shares three classic non-metallic traits, so it is most likely a non-metal (for example sulphur or iodine). This is a correct working rule.
Statement II is stronger and fails: it claims every non-metal is a dull, brittle solid that does not conduct. But many non-metals are gases (oxygen, nitrogen, chlorine), one is a liquid (bromine), and graphite is a non-metal that does conduct electricity. So statement II is not true for all non-metals.
Hence, the answer is Statement I is correct, but Statement II is incorrect.
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