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Problem
In which of the following acids, P—P bonds is present? a. Tetra poly phosphoric acid (
H
6
P
4
O
13
\text{H}_6\text{P}_4\text{O}_{13}
H
6
P
4
O
13
) b. Pyrophosphoric acid (
H
4
P
2
O
7
\text{H}_4\text{P}_2\text{O}_7
H
4
P
2
O
7
) c. Hypophosphoric acid (
H
4
P
2
O
6
\text{H}_4\text{P}_2\text{O}_6
H
4
P
2
O
6
) d. Polymetaphosphoric acid (
(
HPO
3
)
n
(\text{HPO}_3)_n
(
HPO
3
)
n
)
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