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CBSE Class 11-science Answered

It takes 0.15 mole of ClO- to oxidize 12.6g of chromium oxide of a specific formula to Cr2O7 ^ 2-.ClO- became Cl-.The formula of the oxide is atomic weight Cr- 52, O- 16)

(a)CrO3

(b)CrO2

(c)CrO4

(d)CrO

Asked by Balbir | 30 Jun, 2019, 03:45: PM
Expert Answer
Let's suppose formula of Chromium oxide is CrxOy
 
ClO to the power of minus space plus space Cr subscript straight x straight O subscript straight y rightwards arrow Cr subscript 2 straight O subscript 7 to the power of negative 2 end exponent space plus space Cl to the power of minus
plus 1 space space space space space space space space space space space space space space space space space space space space space space plus 6 space space space space space space space space space space space space minus 1

oxidation space state space change space from space ClO to the power of minus space to space Cl to the power of minus space equals 1 minus left parenthesis negative 1 right parenthesis equals 2
suppose space oxidation space state space in space Cr subscript straight x straight O subscript straight y space equals space straight n
Change space in space oxidation space number equals space transfer space of space electrons
It space should space be space same space in space both space cases
So space space 6 minus straight n equals 2
space space space space space space space space space space straight n equals 4

Cr subscript straight x straight O subscript straight y space is space neutral space so
space 4 straight x minus 2 straight y equals 0
2 straight x equals straight y

So space Cr subscript straight x straight O subscript 2 straight x end subscript
space space space space space space space CrO subscript 2 space end subscript space is space correct space answer
 
 
Answered by Ravi | 01 Jul, 2019, 02:31: PM
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