Which of the following set of compounds cannot illustrate law of reciprocal proportion?
(i)P2O3, PH3, H2O
(ii)P2O5, PH3, H2O
(iii)N2O5, NH3, H2O
(iv)N2O, NH3, NO2
Answers
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Explanation:
Law of Reciprocal proportions:-
When two different elements combine with the same mass of a 3
rd
element, the ratio of masses in which they do so must be same or multiple of the mass ratio in which they combine with each other.
A) P
2
O
3
,PH,H
2
O
The ratio of phosphorous combining with oxygen in P
2
O
3
is
P:O=62:48=31:24
The ratio of Phosphorous combining with hydrogen in PH
3
is
P:H=31:3
The ratio of hydrogen combining with oxygen in H
2
O is
H:O=2:16=1:8 ⟶1
Now, the ratio of hydrogen & oxygen combining with P
⇒3:24=1:8 ⟶2
From 1 & 2, 1:8 is same in both cases
∴ Law of reciprocal proportions is illustrated correctly.
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