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NEET2006ChemistryIonic EquilibriumActual

Which of the following pairs constitutes a buffer?

Options

  1. AHCl and KCl
  2. BHNO ₂ and NaNO ₂
  3. CNaOH and NaCl
  4. DHNO ₃ and NH ₄ NO ₃

Correct answer

B. HNO ₂ and NaNO ₂

Step-by-step solution

The pair HNO ₂ and NaNO ₂ constitutes a buffer because HNO ₂ is a weak acid and NaNO ₂ is a salt of a weak acid ( HNO ₂ ) with a strong base ( NaOH ) . Hence, it is an example of an acidic buffer solution. Caution Solutions of a weak acid and its conjugate base or weak base and its conjugate acid are able to maintain pH forming buffer solutions.

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