Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Chemical Reaction
Copper objects lose their shine and form green coating of -
1
Copper oxide
2
Basic copper carbonate
3
Copper carbonate
4
More than one of the above
5
None of the above