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Question

Which of the following represents a correctly balanced half-reaction?


A
Cl2+2eCl
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B
2e+FeFe2+
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C
O22e+2O2
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D
Al3+Al+3e
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E
2H++2eH2
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Solution

The correct option is D $$\displaystyle 2{ H }^{ + }+2{ e }^{ - }\rightarrow { H }_{ 2 }$$
$$2H^+ + 2e^- \rightarrow H_2$$
This is balanced half reaction as there is equal sum number of elements on each side and the sum of charges on each side is also equal.

Chemistry

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