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How many of the following compounds has ...

How many of the following compounds has `X-X` bonds `i.e.,`
single covalent bond between two same elements in their molecules `H_(4)P_(2)O_(6), H_(4)P_(2)O_(5), H_(4)P_(2)O_(7), N_(2)O, N_(2)O_(3), N_(2)O_(4), N_(2)O_(5)`,
`(HPO_(3))_(3)`.

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The correct Answer is:
4
`H_4P_2O_6`(one P-P bond),`N_2O, N_2O_3, N_2O_4` all have one N-N bond each .
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Oxidation states of P in H_(4)P_(2)O_(5),H_(4)P_(2)O_(6),H_(4)P_(2)O_(7) respectively are

H_(4)underline(P_(2))O_(7)+H_(2)O to 2H_(3)PO_(4)

H_(4)underline(P_(2))O_(7)+H_(2)O to 2H_(3)PO_(4)

H_(4)underline(P_(2))O_(8)+H_(2)O to H_(3)PO_(4)+H_(2)O_(2)

How many of these acids have S-S bonds? H_(2)S_(2)O_(3), H_(2)S_(2)O_(6), H_(2)S_(2)O_(7), H_(2)S_(2)O_(8), H_(2)SO_(5), H_(2)S_(n+2)O_(6) . (polythionic acid).

H_(4)underline(B_(2))O_(6)+H_(2)O to H_(3)BO_(3)+H_(2)O_(2)

H_(4)underline(B_(2))O_(6)+H_(2)O to H_(3)BO_(3)+H_(2)O_(2)

H_(4)underline(B_(2))O_(6)+H_(2)O to H_(3)BO_(3)+H_(2)O_(2)

H_(4)underline(P_(2))O_(6)+H_(2)O to H_(3)PO_(3)+H_(3)PO_(4)

H_(4)underline(P_(2))O_(6)+H_(2)O to H_(3)PO_(3)+H_(3)PO_(4)

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