Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following will function as buffer? (1)\[NaCl+NaOH\] (2) Borax + Boric acid (3)\[Na{{H}_{2}}P{{O}_{4}}+NaHP{{O}_{4}}\] (4)\[N{{H}_{4}}Cl+N{{H}_{4}}OH\]A) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
Buffer is a mixture of a weak acid/weak base and its conjugate base/conjugate acid. eg, borax (conjugate base) + boric acid (weak acid),\[N{{H}_{4}}Cl\](conjugate acid)+\[N{{H}_{4}}OH\] (weak base).
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