Question

62 Salts of A (atomic mass 7), B (atomic mass 27) and C (atomic mass 48) were alar
Á under identical conditions using the same quantity of electricity. It was found that when
2.1 g of A was deposited, the weights of B and C deposited were 2.7 g and 7.2 . The
valencies of A, B and C are respectively:
(a) 3, 1 and 2
(b) 1, 3 and 2
(c) 3, 1 and 3
(d) 2, 3 and 2
. Given electrode notentials are​

Answer 1

Answer:

B)1,3,2

Please refer attachment.

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Answer 2

Explanation:

equivalent weight of A=B=C

2.1/7/n1=2.7/27/n2=7.2/48/n3

n1:n2:n3= 0.3:0.1:0.15

= 2:1:1

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