Copper is very slowly oxidised on the surface in moist air, giving a green coating of verdigris. Verdigris is:

{C u}_{2} O

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C u {C O}_{3}

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C u {({C H}_{3} C O O)}_{2} \cdot C u {(O H)}_{2}

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C u {S O}_{4}

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Solution

The correct option is C $C u {({C H}_{3} C O O)}_{2} \cdot C u {(O H)}_{2}$
On exposure of copper to moist air having carbon dioxide, a coating of green layer of basic carbonate $C u C O_{3} . C u (O H)_{2}$ , known as verdigris is formed.

$2 C u + H_{2} O + C O_{2} + O_{2} \to C u C O_{3} . C u (O H)_{2} v e r d i g r i s$

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Question 16
If copper is kept in open air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
(a) ${CuSO}_{4}$
(b) ${CuCO}_{3}$
(c) ${Cu(NO}_{3})_{2}$
(d) $CuO$

Q. "In moist air, copper corrodes to produce a green layer on the surface". For this, the reaction is :

C u + H_{2} O + {C O}_{2} + O_{2} \to C u {C O}_{3} \cdot C u {(O H)}_{2}

If the statement is true enter 1 else enter 0.

If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to ___ of copper.

When a copper object is exposed to moist air for a long time,then a green coating is formed on its surface.

(a) What is the material of the green coating ?

(b) State whether the green coating is acidic or basic.

Q. If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of:

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Copper is very slowly oxidised on the surface in moist air, giving a green coating of verdigris. Verdigris is:

The correct option is C Cu(CH3COO)2⋅Cu(OH)2On exposure of copper to moist air having carbon dioxide, a coating of green layer of basic carbonate CuCO3.Cu(OH)2, known as verdigris is formed.2Cu+H2O+CO2+O2→CuCO3.Cu(OH)2verdigris