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In a Carius determination, 0.35g of an o...

In a Carius determination, 0.35g of an organic substance gave 0.34g of barium sulfate. Calculate the percentage of sulphur in the given compound. [Ba=137,S=32,O=16]

A

11.89%

B

13.34%

C

24%

D

14%

Text Solution

Verified by Experts

The correct Answer is:
B
(A)In both compounds central metal has +6 oxidation state
(B)Sodium dichromate is `Na_2Cr_2O_7. 2H_2O`, so it can not be weighed correctly for the prepartion of standard solution.
(C )`2K_2Cr_2O_7 oversetDeltato2K_2CrO_4 +Cr_2O_3`(green ) +`3//2 O_2 uarr`
(D)`4KMnO_4 + 4KOH oversetDeltato 4K_2 MnO_4` (green residue) +`2H_2O uarr + O_2 uarr`
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