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Questions  >>  EAMCET  >>  Chemistry
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Which pair of oxyacids of phosphorous contains $'P-H'$ bonds ?

\[\begin {array} {1 1} (1)\;H_3PO_4,H_3PO_3 & \quad (2)\;H_3P0_5,H_4P_2O_7\\ (3)\;H_3PO_3,H_3PO_2 & \quad (4)\;H_3PO_2,HPO_3 \end {array}\]

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