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Question

The number of electrons lost in the following change is :
$$Fe+{ H }_{ 2 }O\longrightarrow { Fe }_{ 3 }{ O }_{ 4 }+{ H }_{ 2 }$$


A
2
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B
4
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C
6
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D
8
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Solution

The correct option is C 8
$$3\overset { 0 }{ Fe } +8{ e }^{ - }\longrightarrow { \left( { Fe }^{ { 8 }/{ 3+ } } \right)  }_{ 3 }$$
         $$2{ H }^{ \oplus  }\longrightarrow \overset { 0 }{ { H }_{ 2 } } +2{ e }^{ - }\times 4$$
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$$3Fe+4{ H }_{ 2 }O\longrightarrow { Fe }_{ 3 }{ O }_{ 4 }+4{ H }_{ 2 }O$$
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Total number of electrons lost or gained is 8.

Chemistry

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