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Q.

Which of the following is tetra basic acid ?

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a

Ortho phosphorus acid

b

Ortho phosphoric acid

c

Pyro phosphoric acid

d

Meta phosphoric acid

answer is D.

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Detailed Solution

Pyro phosphoric acid is derived from the parent acid by eliminating two water molecules. Pyro phosphoric acid contains four H atoms attached to electronegative O atom. So, its basicity is 4.

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