1.

How many of the following will have (M-O-M) oxylinkage ? P_(4)O_(6), P_(4)O_(8), P_(4)O_(10), P_(4)S_(6), P_(4)S_(3), H_(2)S_(3)O_(6), H_(7)P_(5)O_(16), H_(4)P_(2)O_(8), H_(2)S_(2)O_(8), H_(2)S_(2)O_(6)

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ANSWER :4


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