The following reactions occur in a primary cell battery - VCE - SSCE Chemistry - Question 26 - 2020 - Paper 1
Question 26
The following reactions occur in a primary cell battery.
Zn + 2OH⁻ → ZnO + H₂O + 2e⁻
2MnO₂ + 2e⁻ + H₂O → Mn₂O₃ + 2OH⁻
Which one of the following statements about t... show full transcript
Worked Solution & Example Answer:The following reactions occur in a primary cell battery - VCE - SSCE Chemistry - Question 26 - 2020 - Paper 1
Step 1
A. The reaction produces heat and Zn reacts directly with MnO₂.
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Answer
This statement is incorrect because while reactions in batteries can produce heat, the zinc does not react directly with MnO₂.
Step 2
B. The reaction produces heat and Zn does not react directly with MnO₂.
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Answer
This statement is also incorrect as it suggests heat production without direct interaction between zinc and MnO₂.
Step 3
C. The reaction does not produce heat and Zn reacts directly with MnO₂.
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Answer
This statement is incorrect as it asserts direct reaction between zinc and MnO₂, which does not occur.
Step 4
D. The reaction does not produce heat and Zn does not react directly with MnO₂.
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Answer
This statement is correct. The overall battery reaction does not produce significant heat and Zn does not directly react with MnO₂.
