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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry6.2. Equilibrium - II (icon Equilibrium)1 Mark
MCQ
Incorrect statement for the use of indicators in acid-base titration is :
  • ✓
    Methyl orange may be used for a weak acid vs weak base titration.
  • B
    Methyl orange is a suitable indicator for a strong acid vs weak base titration
  • C
    Phenolphthalein is a suitable indicator for a weak acid vs strong base titration
  • D
    Phenolphthalein may be used for a strong acid vs strong base titration.
✓

Answer

Correct option: A.
Methyl orange may be used for a weak acid vs weak base titration.
a
Indicator $pH$ range
Methyl orange $3.2-4.5$
Phenolpthalein $8.3-10.5$

Methyl orange may be used for a strong acid vs strong base and strong acid vs weak base titration. Phenolpthalein may be used for a strong acid vs strong base and weak acid vs strong base titration.

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