Aqueous sodium hydroxide is added to a solution of a salt. A blue precipitate is formed which does not dissolve in excess.
Aluminium foil is added to the mixture and the mixture is warmed. A gas is produced that turns damp red litmus paper blue.
What is the name of the salt?
1 )
ammonium nitrate
2 )
ammonium sulfate
copper(II) nitrate
4 )
copper(II) sulfate
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