Why is zinc not extracted from zinc oxide through reduction using CO?
The standard Gibbs free energy of formation of ZnO from Zn is lower than that of CO2 from CO. Therefore, CO cannot reduce ZnO to Zn. Hence, Zn is not extracted from ZnO through reduction using CO.
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table:
| Experiment |
A/ mol L - 1 |
B/ mol L - 1 |
Initial rate/mol L - 1 min - 1 |
| I | 0.1 | 0.1 |
2.0 × 10 - 2 |
| II | -- | 0.2 |
4.0 × 10 - 2 |
| III | 0.4 | 0.4 | -- |
| IV | -- | 0.2 |
2.0 × 10 - 2 |
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The standard Gibbs free energy of formation of ZnO from Zn is lower than that of CO2 from CO. Therefore, CO cannot reduce ZnO to Zn. Hence, Zn is not extracted from ZnO through reduction using CO....
Step-by-step explanation:
• The standard Gibbs free energy of formation of ZnO from Zn is lower than that of CO2 from CO
• Therefore, CO cannot reduce ZnO to Zn
• Hence, Zn is not extracted from ZnO through reduction using CO
•
This question is important because it tests key concepts from the NCERT syllabus and is frequently asked in CBSE exams.
This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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Student Discussion
1) 2ZnO --> 2Zn + O2. And
2) 2CO + O2 --> 2CO2.
Now take a look on the ellingham's graph. See that the graph of eq(1) is lowe than graph of eq (2) which means that CO can't reduce ZnO to Zn, therefore, CO is not used.
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