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When copper is placed in the atmosphere ...

When copper is placed in the atmosphere for sufficient time, a green crust is formed on its surface. The composition of the green crust is:

A

`CU(OH)_(2)`

B

`CuO`

C

`CuCO_(3)`

D

`CuCO_(3).Cu(OH)_(2)`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the green crust formed on copper when exposed to the atmosphere, we can follow these steps: ### Step 1: Understand the Reaction When copper is exposed to air, it undergoes a reaction with carbon dioxide (CO2) and water (H2O) present in the atmosphere. This reaction leads to the formation of a green crust. **Hint:** Consider the components in the atmosphere that can react with copper. ### Step 2: Identify the Products The primary products formed from the reaction of copper with carbon dioxide and water are copper carbonate (CuCO3) and copper hydroxide (Cu(OH)2). The green color of the crust is mainly due to these compounds. **Hint:** Think about the common compounds that can form from copper and atmospheric components. ### Step 3: Analyze the Options In the given options, we need to identify which one represents the composition of the green crust. The correct representation of the green crust formed on copper is often given as CuCO3·Cu(OH)2, which indicates a combination of copper carbonate and copper hydroxide. **Hint:** Look for a chemical formula that includes both copper carbonate and hydroxide. ### Step 4: Conclude the Answer After analyzing the options, the correct composition of the green crust formed on copper is CuCO3·Cu(OH)2, which represents the combination of copper carbonate and copper hydroxide. **Hint:** Ensure that the answer reflects the combination of the two main products formed during the reaction. ### Final Answer The composition of the green crust formed on copper when exposed to the atmosphere is CuCO3·Cu(OH)2.
To solve the question regarding the green crust formed on copper when exposed to the atmosphere, we can follow these steps: ### Step 1: Understand the Reaction When copper is exposed to air, it undergoes a reaction with carbon dioxide (CO2) and water (H2O) present in the atmosphere. This reaction leads to the formation of a green crust. **Hint:** Consider the components in the atmosphere that can react with copper. ### Step 2: Identify the Products ...
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