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Heavy Metals: Copper

Write the action of it upon I)moist air II) conc. H₂SO

i. Action with moist air: After long exposure to moist air, a green layer of its basic carbonate is formed over it.

2Cu + H₂O + CO₂ + O₂ ---------------> CuCO₃.Cu(OH)₂

ii. Action of Conc. H₂SO₄: When heated with conc.H₂SO₄Sulphur dioxide gas is formed.

Cu + 2H₂SO₄-------------------> Cu(NO₃)₂ + 2NO₂ + 2H₂O

What is the composition of ‘Copper matte’?

Copper sulphide contains some amount of iron sulphide as impurities which is called copper matte.
Copper matte mainly consists of cuprous sulphide and little ferrous sulphide.

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