CTET 2 Math and Science Sep 2014 Paper

Question : 73 of 120

Marks: +1, -0

When a copper plate is exposed to moist air for long, it acquires a dull green coating. The green material is

copper sulphate
a mixture of copper hydroxide and copper sulphate
a mixture of copper carbonate and copper sulphate
a mixture of copper carbonate and copper hydroxide

Solution:

When a copper plate is exposed to moist air for long time. It acquires a dull green coating. The green material is a mixture of copper hydroxide and copper carbonate.

2{Cu}+{H}_{2}{O}+{CO}_{2}+{O}_{2}→{Cu}({OH})_{2}+{CuCO}_{3}

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