Question

which one of the following sets of compounds correctly the law of reciprocal proportions A) P2O3 ,PH3 ,H2O B) P2O5,PH3,H2O C)N2O5,NH3,H2O D)N2O,NH3,H2O E) NO2,NH3,H2O​

Answer 1

Explanation:

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CHEMISTRY

Which one of the following sets of compounds correctly illustrate the law of reciprocal proportions.

ANSWER

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.