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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2007
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Q)
The $pK_a$ of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid ionised is :
( A ) $9.5$
( B ) $2.5$
( C ) $7.0$
( D ) $4.5$
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