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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ie163

Buffer X: 0.50 M HA + 0.50 M NaA. Buffer Y: 0.05 M HA + 0.05 M NaA. Same acid (). To 1.0 L of each, 0.02 mol NaOH is added (no volume change). Select the correct statements.

  1. AInitially both have pH 4.74
  2. BThe pH change in X is smaller than in Y
  3. CThe final pH of Y is about 5.11
  4. DThe final pH of X is about 4.84

Answer: A, B, C

X: log(0.52/0.48) = 0.035, pH 4.77. Y: log(0.07/0.03) = 0.368, pH 5.11. So (a), (b), (c) are correct; X ends near 4.77, not 4.84 (d false). The larger buffer resists change better.
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