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Salts A(atomic weight 7), B(atomic weight 27) and C(atomic weight 48) were electrolysed under identical conditions using the same quantity of electricity. It was found that when 2.1g of A was deposited, the weights of B and C deposited were 2.7g and 7.2 g. The valencies of A,B and C are respectively

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An Intiative by Sri Chaitanya

2, 3 and 2

1, 3 and 2

3, 1 and 2

3, 1 and 3

answer is B.

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Detailed Solution

A B C

$E_{1} : E_{2} : E_{3} = m_{1} : m_{2} : m_{3}$

$\frac{{AtWt}_{1}}{V_{1}} : \frac{{AtWt}_{2}}{V_{2}} : \frac{{AtWt}_{3}}{V_{3}} = m_{1} : m_{2} : m_{3}$

$\frac{7}{V_{1}} : \frac{27}{V_{2}} : \frac{48}{V_{3}} = 2.1 : 2.7 : 7.2$

$\frac{7}{V_{1}} : \frac{V_{2}}{27} = \frac{2.1}{2.7} . . . . . . . . . . (1)$

$\frac{V_{2}}{V_{1}} = \frac{3}{1}$

$\frac{27}{V_{2}} x \frac{V_{2}}{48} = \frac{2.7}{7.2}$

$v_{2} = 3$

$v_{3} = 2$

$v_{1} : v_{2} : v_{3} = 1 : 3 : 2$

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