Question

The number of P-0-P bond in cyclic metaphosphoric acid is
(d) four
(a) two

(b) zero
(c) three
​

Answer 1

Three

{ For bur more clarity refer to the attachment }

• There are basically three P - O - P Bond present in cyclic metaphosphoric acid.

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Metaphosphoric Acid

• The General formula: {HPO3}n
• π Bond = 3 and Sigma = 15

▫️ All the double bonds have one Sigma and one pi bond whereas , a single bond contains only sigma bond counting is done on basis of the number of double and single bonds , in case of triple bond one is Sigma and just 2 bonds are pi bonds.

Prepration

• Heating of phosphoric acid for long time results in formation of metaphosphoric acid.

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Additional information

• Molecular mass = 80
• Mostly colourless in nature and also acts as good dehydrating agent.