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p-Block Elements: Groups 15 and 16
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Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus
JEE Main level
Single correct option
Difficulty 2 of 3
pn136
Upon heating, orthophosphorous acid disproportionates to give
A
P
X
4
O
X
10
and
H
X
2
B
H
X
3
PO
X
4
and
PH
X
3
C
H
X
3
PO
X
4
and
H
X
2
D
H
X
3
PO
X
2
and
H
X
3
PO
X
4
Answer: B
The reaction is
4
H
X
3
PO
X
3
3
H
X
3
PO
X
4
+
PH
X
3
. P(+3) is oxidised to +5 in H3PO4 and reduced to
−
3
in PH3.
Practice p-Block Elements: Groups 15 and 16
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