A certain aqueous solution contains three oroacids of phosphorus : X, Y and Z. Acid X is 4.58% hydrogen and 46.9% phosphorus by mass; acid Y is 37.8%
phosphorus by mass; the total number of atoms in a molecule of Z is 14.3% greater than in a molecule of Y. (Atomic mass, H = 1,0 - 16, P = 31)
Which of the following is correct regarding oxoacid X ?
Options
OA)
It is tribasic
Ов)
Its equivalent mass is equal to molecular mass
Oc)Only one H-atom is bonded to phosphorus atom
OD)
It is called as orthophosphoric acid
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Answer:
B) Its equivalent mass is equal to molecular mass.
Explanation:
Let, Molecular weight of X= M
Here,
Mass of Oxygen in X=100-(46.9+4.58)%
=48.52%
From given information, we can say, for Phosphorus,
(31/M)=0.469
or, M= 31/0.469
or, M=66
So, the molecular weight of X is 66g.
For Oxygen, (16n/66)=0.4852
or, 16n= 32
or, n= 2
For Hydrogen, (n/66)= 0.0458
or, n= 3
So, the acid is H3PO2 (Hypophosphorus Acid)
The Equivalent mass and molecular mass both are 66g for H3PO2.
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