PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoAnswer the following questions:
1. On heating copper powder in air, the surface of copper powder becomes coated with black \(CuO\). How can this black coating be converted into brown copper? Write chemical equation for the reaction that occurs during the colour change.
2. Give one example of each:
a. Chemical reaction showing evolution of a gas.
b. Change in colour of a substance during chemical reaction.
a. Chemical reaction showing evolution of a gas.
b. Change in colour of a substance during chemical reaction.
3. Consider the chemical equations given below and answer the questions which follow:
(i). \(CuO\) + \(H_2\) \(\xrightarrow[]{Heat}\) \(Cu\) + \(H_2O\)
(ii). \(ZnO\) + \(C\) \(\xrightarrow[]{Heat}\) \(Zn\) + \(CO\)
a. Name the substances that are oxidised and reduced respectively in each case,
b. Identify the reducing agent in each case.
(i). \(CuO\) + \(H_2\) \(\xrightarrow[]{Heat}\) \(Cu\) + \(H_2O\)
(ii). \(ZnO\) + \(C\) \(\xrightarrow[]{Heat}\) \(Zn\) + \(CO\)
a. Name the substances that are oxidised and reduced respectively in each case,
b. Identify the reducing agent in each case.
Important!
Check the answers with the help of your teacher.
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