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JEE Main levelSingle correct optionDifficulty 2 of 3ia118

What is $[OH X^{-}]$ in $0.20 M$ $HCOONa$ ? ( $K_{a}$ of formic acid $= 1.8 \times 1 0^{- 4}$ )

A $1.1 \times 1 0^{- 11} M$
B $3.3 \times 1 0^{- 6} M$
C $6.0 \times 1 0^{- 3} M$
D $5.6 \times 1 0^{- 11} M$

Answer: B

K_{h} = K_{w} / K_{a} = 5.6 \times 1 0^{- 11}

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[OH X^{-}] = K_{h} C = 5.6 \times 1 0^{- 11} \times 0.20 = 3.3 \times 1 0^{- 6} M

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