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Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: Which of the .................is a buffer
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sunip_the_mini_mastermind (133)

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Olaaa!! Perrrfect answer. 19  [38 rates]

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in the first one HCl is a strong acid ...so it will not act as a buffer.
in the second one as HCN is a weak acid and calcium hydroxide is a base so it is not true from the definition of buffer...
so the only option that remains is C)

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