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  4. A current of 2 amp when passed for 5 hour through a molten salt deposits 22.2 g of metal of atomic mass 177. The oxidation state of the metal in the metal salt is [Report your answer by rounding it upto nearset whole number]

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Q. A current of 2 amp when passed for 5 hour through a molten salt deposits 22.2 g of metal of atomic mass 177. The oxidation state of the metal in the metal salt is

[Report your answer by rounding it upto nearset whole number]

NTA AbhyasNTA Abhyas 2020Electrochemistry

Solution:

$W=\frac{I t E}{96500}$

$E=\frac{W \times 96500}{I t}=\frac{22.2 \times 96500}{2 \times 5 \times 3600}=59.5$

Equivalent mass $=\frac{A t o m i c \, \text{mass}}{O x i d a t i o n \, s t a t e}$

$59.5=\frac{177}{n}$

So $n\approx 3$ .