Redox Reactions And Electrochemistry Ques 730
Question: Salts of A (atomic weight: 7), B (atomic weight: 27), and C (atomic weight: 48) were electrolyzed under identical condition using the same quantity of electricity. It was found that when 2.1 got A was deposited, the weights of B and C deposited were 2.7 and 7.2 g, respectively. The valencies of A, B and C, respectively are:
Options:
A) 3, 1 and 2
B) 1, 3 and 2
C) 3, 1 and 3
D) 2, 3 and 2
Show Answer
Answer:
Correct Answer: B
Solution:
[b] Eq. of A = Eq. of B = Eq. of C $ \frac{2.1}{7/n_1}=\frac{2.7}{27/n_2}=\frac{7.2}{48/n_3} $ $ 0.3n_1=0.1n_2=0.15n_3 $
$ \therefore $ $ n_1=\frac{n_2}{3}=\frac{n_3}{2}=( n_1,n_2,n_3 ) $ are integers.
