7. Seema's grandfather filled a copper glass
with water and kept it aside. He forgot about
this glass. After a few days, he found a dull
green coating on the glass. Seema was
surprised
Her grandfather told her that this layer
contains a mixture of
a copper hydroxide and copper carbonate
B copper hydroxide and copper oxide
copper oxide and copper sulphide
copper sulphate and copper oxide
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What is the question here ?
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copper oxide or coppre sulphide
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