If a strip of aluminium with scratched clean surface is dipped into
Answers
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Explanation:
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Answer:
Explanation:Why metals are not found in their free state
generally?
b. If a strip of aluminium with scratched clean
surface is dipped into an aqueous solution of
copper sulphate for little time, surface of the
strip becomes brownish. What is the reason for
this? Write the balanced chemical equation for
the reaction.
Most of the metals are found in the form of their
compounds, i.e., in the combined state. It is
because, their position is above hydrogen in the
chemical reactivity series and hence, readily react
with air, water, carbon dioxide, etc. They are
found in the form of their sulphides, carbonates
or oxides.
b. When a strip of aluminium is dipped into an
aqueous solution of copper sulphate it will
displace copper and forms aluminium sulphate.
Copper will deposit on the surface of aluminium
strip so that it will become brownish
Copper Aluminium Aluminium Copper
sulphate sulphate
3CuSO4
(aq) + 2Al(s) $ Al2
(SO4
)3
(aq) + 3Cu
Copper Aluminium Aluminium Copper
sulphate sulphate