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CBSE Class 11-science Answered

1 mole of ferric oxalate is oxidized by x mole of MnO4- and also 1 mole of ferrous oxalate is oxidized by y mole of MnO4- in acidic medium . The ratio (x/y) is :

(a) 2:1

(b) 1:2

(c) 3:1

(d) 1:3

Asked by Balbir | 30 Jun, 2019, 12:17: PM
Expert Answer
Option(a) is correct.
 
Given:
 
Fe subscript 2 open parentheses straight C subscript 2 straight O subscript 4 close parentheses subscript 3 space space plus space MnO subscript 4 superscript minus space rightwards arrow with space space space space space space space space space space space space space on top Fe to the power of 3 plus end exponent space plus space CO subscript 2 space plus space Mn to the power of 2 plus end exponent

FeC subscript 2 straight O subscript 4 space space plus space MnO subscript 4 superscript minus space rightwards arrow with space space space space space space space space space space space space space on top Fe to the power of 3 plus end exponent space plus space CO subscript 2 space plus space Mn to the power of 2 plus end exponent

straight n subscript Fe subscript 2 open parentheses straight C subscript 2 straight O subscript 4 close parentheses subscript 3 end subscript over straight n subscript MnO subscript 4 superscript minus end subscript space equals space 5 over 6 space equals 1 over straight x

straight x space equals space 6 over 5
 
No. of moles are inversally proportional to n-factor.
 
straight n subscript Fe open parentheses straight C subscript 2 straight O subscript 4 close parentheses subscript 3 space end subscript over straight n subscript MnO subscript 4 to the power of minus end subscript space equals space 5 over 3 equals 1 over straight y

straight y equals space 3 over 5

Now comma

straight x over straight y equals space 6 over 5 cross times 5 over 3

straight x over straight y equals 2 over 1

straight x colon straight y space equals space 2 colon 1
 
the ration x:y is 2:1.
Answered by Varsha | 01 Jul, 2019, 02:54: PM
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