The pH values of three solutions P,Q and...

The pH values of three solutions P,Q and R respectively having equal molar concentrations are `5.0 , 2.8 and 3.5 ` respectively at 298 K . Which represents the correct order of their acid strength ?

A

`P lt R lt Q`

B

`P lt Q lt R`

C

`R lt Q lt P`

D

`Q lt R lt P `

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