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STD 11 - 6.2. Equilibrium - II (icon Equilibrium) — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 6.2. Equilibrium - II (icon Equilibrium)4 Marks
MCQ
Given below are two statements.

Statement $I:$ In the titration between strong acid and weak base methyl orange is suitable as an indicator.

Statement $II:$ For titration of acetic acid with $\mathrm{NaOH}$ phenolphthalein is not a suitable indicator.

In the light of the above statements, choose the most appropriate answer from the options given below:

  • A
    Statement $I$ is false but Statement $II$ is true
  • ✓
    Statement $I$ is true but Statement $II$ is false
  • C
    Both Statement $I$ and Statement $II$ are true
  • D
    Both Statement $I$ and Statement $II$ are false
✓

Answer

Correct option: B.
Statement $I$ is true but Statement $II$ is false
b
Titration curve for strong acid and weak base initially a buffer of weak base and conjugate acid is:

Formed, thus $\mathrm{pH}$ falls slowly and after equivalence point, so the $\mathrm{pH}$ falls sharply so methyl arrange, having $\mathrm{pH}$ range of $3.2$ to $4.4$ will weak as indicator. So statement$-I$ is correct.

Titration curve for weak acid and strong base $(\mathrm{NaOH})$ Initially weak acid will form a buffer so $\mathrm{pH}$ increases slowly but after equivalence point. it rises sharply covering range of phenolphthalein so it will be suitable indicator so statement$-II$ is false.

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