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(d) Estimation of phosphorous: A known...

(d) Estimation of phosphorous:
A known mass of compound is heated with fuming `HNO_(3)` or sodium peroxide `(Na_(2)O_(2))` in Carius tube which converts phosphorrous to `H_(3)PO_(4)` . Magnesia mixture `(MgCl_(2) + NH_(4)Cl)` is then added, which gives the precipitate of magnesium ammonium phosphate `(MgNH_(4).PO_(4))` which on heating gives magnesium pyrophosphate `(Mg_(2)P_(2)O_(7))` , which is weighed.
0.124 gm of an organic compound containing phosphorus gave 0.222 gm of `Mg_(2)P_(2)O_(7)` by the usual analysis . Calculate the percentage of phosphorous in the compound (Mg=24, P=31)

A

25

B

75

C

62

D

50

Text Solution

Verified by Experts

The correct Answer is:
D
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