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JAMB Chemistry 2019 Paper

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Question : 72

Total: 80

The cost of discharging 6.0g of a divalent metal, X from its salt is ₦12.00. What is the cost of discharging 9.0g of a trivalent metal, Y from its salt under the same condition?

[X = 63, Y = 27, 1F = 96,500C]

N12.00
N27.00
N63.00
N95.00

Solution:

For X: X $^{2+}$ + 2e $^{-}$ $\to$ X

2F = 63g

xF = 6g

x = $\frac{6 \times 2}{63} = \frac{4}{21} F$

$\frac{4}{21}$ F = N12.00

1F = $\frac{12}{\frac{4}{21}}$

= N63.00

1F is equivalent to N63.00.

For Y: Y $^{3+}$ + 3e $^{-}$ $\to$ Y

3F = 27g

xF = 9g

x = $\frac{3 \times 9}{27}$

= 1F

1F = N63.00

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