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The conjugate acid of ${ H }_{ 2 }P{ O }_{ 4 }^{ - }$ is

A

${ H }_{ 3}P{ O }_{ 4 }$

B

${ H }_{ 2 }P{ O }_{ 4 }^{ - }$

C

${ HP }{ O }_{ 4 }^{ 2- }$

D

$P{ O }_{ 4 }^{ 3- }$

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