JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Copper becomes green when exposed to moist air for a long period. This is due to

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Correct option: B

the formation of a layer of basic carbonate of copper on the surface of copper.

Option B (the formation of a layer of basic carbonate of copper on the surface of copper) is correct because copper reacts with carbon dioxide and moisture in the air to form a green layer of basic copper carbonate.

More Questions from d & f- BLOCK ELEMENTS

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Mercury is transported in metal containers made of: Cadmipone is a mixture of: The number of element from the following that do not belong to lanthanoids is :
Eu, Cm, Er, Tb, Yb and Lu Statement-I:

{Sm}^{3+}

{Dy}^{3+}

have same colour (yellow).

Statement-II: Both ions are having same number of unpaired electrons. The most common oxidation state of Lanthanoid
elements is +3. Which of the following is likely to
also form other oxidation state? A mixture of

\mathrm{Ti}{\mathrm{O}_2}

and

\mathrm{BaS}{\mathrm{O}_4}

is called