D-And F-Block Elements Ques 191
Question: When metallic copper comes in contact with moisture, a green powdery/ pasty coating can be seen over it. This is chemically known as
[AFMC 2002]
Options:
A) Copper sulphide - Copper carbonate
B) Copper carbonate - Copper sulphate
C) Copper carbonate - Copper hydroxide
D) Copper Sulphate - Copper sulphide
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Answer:
Correct Answer: C
Solution:
$ Cu+O_2+CO_2+H_2O\to Cu{{(OH)}_2}.CuCO_3 $
