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Question

3 Faradays of electricity was passed through an aqueous solution of iron (II) bromide. The weight (in g) of iron metal (atomic weight =56 amu) deposited at the cathode is:

A
56
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B
84
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C
112
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D
168
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Solution

The correct option is A 84
3 Faradays of electricity was passed through an aqueous solution of iron (II) bromide.

3 F of electricity 3 moles of electrons
Fe2++2eFe
2 moles of electrons gives 1 mole of Fe
3 moles of electrons gives =32 moles of Fe

=32×56 =84 g

Hence, 84 g of iron metal is deposited at the cathode.

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