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{:(" Column -I" , "Column -II") ,( (A)" ...

`{:(" Column -I" , "Column -II") ,( (A)" pH of a basic buffer mixture ", (P) pK_a+log"" (["salt"])/(["Acid"])),((B) "pH of an acidic buffer mixture ",(Q) (pK_a)_(C,Acid) +log""(["Base"])/(["salt"])),((C) "pH of salt solution of weak acid + strong base ", ( R ) (1)/(2) [pK_(W) +pK_a+logc)), ((D) "pH of a salt solution of strong acid + weak base ", (S) (1)/(2) [pK_W -pK_b -log c ]):}`

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The correct Answer is:
A-Q; B-P; C-R; D-S
Basic buffer ` to pOH =pKb+ log ""(S)/(B) `
` rArr pH =(pK_a) +log ""( B)/(S) ` acid buffer ` to pH =pK_a +log ""(S)/(A) `
`WA + SB rArr ` anion hydrolysis
`rArr pH =7+ ((pKa+ logc )/( 2))`
` WB+SA rArr ` cation hydrolysis
` rArr pH =7- ((pK_b+log c)/( 2))`
`WB +SA rArr ` cation hydrolysis
` rArr pH = 7- ((pK_b+log c)/(2))`
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