Corrosion — task. Chemistry CBSE Live product, Class 7 (2026-27).

Choose the best answer:

1. The black coating on silver is due to

its exposure to oil
its exposure to heat
its exposure to light
its exposure to air

2. The Green colour coating on Copper is due to the formation of

Copper Carbonate
Cupric oxide
Cuprous oxide
Copper sulphate

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