Column A
1.
What is the oxidation number of Phosphorous in H3PO3?
:
What is the oxidation number of Phosphorous in H3PO3?
2.
What is the oxidation number of Phosphorous in HPO3?
:
What is the oxidation number of Phosphorous in HPO3?
3.
What is the oxidation number of Phosphorous in H3PO2?
:
What is the oxidation number of Phosphorous in H3PO2?
Column B
a.The oxidation number is +3.
b.The oxidation number is +1.
c.The oxidation number is +5.
To determine the oxidation number of phosphorous in the compounds mentioned, we must consider the typical oxidation states of hydrogen and oxygen, which are +1 and -2, respectively, unless in peroxides or hydrides which is not the case here. The sum of oxidation numbers in a neutral compound must be zero.
1. For H3PO3 (phosphorous acid):
Let's use "x" as the oxidation number for phosphorous.
Thus, we have:
3(+1) + x + 3(-2) = 0
3 + x - 6 = 0
x = 6 - 3
x = +3
So, the oxidation number of Phosphorous in H3PO3 is +3.
The correct match is:
1. a.The oxidation number is +3.
2. For HPO3 (phosphoric acid):
Again, let "x" be the oxidation state of phosphorous.
(+1) + x + 3(-2) = 0
1 + x - 6 = 0
x = 6 - 1
x = +5
So, the oxidation number of Phosphorous in HPO3 is +5.
The correct match is:
2. c.The oxidation number is +5.
3. For H3PO2 (hypophosphorous acid):
Using "x" as the oxidation number for phosphorous:
3(+1) + x + 2(-2) = 0
3 + x - 4 = 0
x = 4 - 3
x = +1
So, the oxidation number of Phosphorous in H3PO2 is +1.
The correct match is:
3. b.The oxidation number is +1.