1.

0.5 gm of an organic substance containing phosphorous was heated with conc. HNO_(3) in the Carius tube. The phosphoric acid thus formed was precipitated with magnesia mixture (MgNH_(4)PO_(4)) which on ignition gave a residue of 1.0 gm of magnesium pyrophosphate (Mg_(2)P_(2)O_(7)). The percentage of phosphorous in the organic compound is :

Answer»

0.5585
0.2972
0.1918
0.205

Solution :`%P=(62)/(222) xx ("X MASS of" Mg_(2)P_(2)O_(7) xx 100)/("mass of organic compound")=(62)/(222) xx (1 xx 100)/(0.5)=55.85 %`


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