A metal M left in moist air for a long time , loses its shiny brown surface and gains a green coat. Name the metal and its compound.

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Solution

The metal 'X' is Copper. when copper corrodes due to the action of moisture the green coating of basic copper carbonate (CuCO₃.Cu(OH)₂) is formed.

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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
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(b) ${CuCO}_{3}$
(c) ${Cu(NO}_{3})_{2}$
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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. Assertion :You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Reason: Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. Tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its charateristic lustre.

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A metal M left in moist air for a long time , loses its shiny brown surface and gains a green coat. Name the metal and its compound.

The metal 'X' is Copper. when copper corrodes due to the action of moisture the green coating of basic copper carbonate (CuCO3.Cu(OH)2) is formed.

The metal 'X' is Copper. when copper corrodes due to the action of moisture the green coating of basic copper carbonate (CuCO₃.Cu(OH)₂) is formed.