Which of the following will produce a buffer solution when mixed in equal volumes?

 (i) 0.1 mol\; dm^{-3} NH_{4}OH \; and\; 0.1\; mol \; dm^{-3} HCl

 (ii) 0.05 \; mol\; dm^{-3} NH_{4}OH \; and\; 0.1\; mol \; dm^{-3} HCl

 (iii) 0.1 \; mol\; dm^{-3} NH_{4}OH \; and\; 0.05\; mol \; dm^{-3} HCl

(iv) 0.1 \; mol\; dm^{-3} \;CH_{3}COONa \; and\; 0.1\; mol \; dm^{-3} NaOH

Answers (1)

The answer is the option (iii) 0.1 \; mol\; dm^{-3} NH_{4}OH \; and\; 0.05\; mol \; dm^{-3} HCl

 Explanation: A mixture of ammonium chloride and ammonium hydroxide acts as a buffer.

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