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JEE Main2017Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

The number of P - OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid H 4 P 2 O 7 , respectively are:

Options

  1. AFive and four.
  2. BFour and five.
  3. CFive and five.
  4. DFour and four.

Correct answer

B. Four and five.

Step-by-step solution

As we can clearly see in the structure, the number of P − OH bonds is 4. The oxygen is an electronegative element and will always carry a negative charge. Now, it depends on its surrounding atoms about what charge it carries. In case of a hydroxyl group, the hydrogen carries a +1 charge. So, the opposite charge generated on the oxygen atom along with magnitude will be -1. In the case of only oxygen atoms, we know that the oxidation number of oxygen is equal to -2. So, the charge generated on the adjacent atom

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