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underset(2(X)overset(-H(2)O)rarr(Y)overs...

`underset(2(X)overset(-H_(2)O)rarr(Y)overset(+[O])rarr(Z)" ")underset((X)overset(+[O])rarr(Z'))underset(darr" ")("Monomeric meta phosphoric acid"+H_(2)O)`
How many `'pi'` bonds are present in (Z') and (Z) ?

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The correct Answer is:
21
`HPO_(3)+H_(2)Orarrunderset((X))(H_(3)PO_(4))overset(+O)rarrunderset((Z))(H_(3)PO_(5))`
`YrarrH_(4)P_(2)O_(7),ZrarrH_(4)P_(2)O_(8)`
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