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होम › रसायन विज्ञान › Indicators

Indicators — Chemistry Questions & Practice

8 Indicators questions from Chemistry for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong. का अभ्यास करें

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Indicators पर अभ्यास प्रश्न — उत्तर सहित

Try each question first, then open the answer. Explanations are included.

1. What color does phenolphthalein indicator turn in an acidic solution?

  1. APink
  2. BYellow
  3. CBlue
  4. DColorless
उत्तर दिखाएँ

उत्तर: D

Phenolphthalein is colorless in acidic and neutral solutions, turning pink only in basic (alkaline) solutions.

2. What color does phenolphthalein indicator turn in a basic (alkaline) solution?

  1. AColorless
  2. BPink
  3. CYellow
  4. DBlue
उत्तर दिखाएँ

उत्तर: B

Phenolphthalein turns pink in basic solutions (pH above about 8.2), a widely used indicator in acid-base titrations.

3. What color does methyl orange indicator turn in an acidic solution?

  1. ABlue
  2. BOrange (its color in neutral form)
  3. CYellow
  4. DRed
उत्तर दिखाएँ

उत्तर: D

Methyl orange turns red in strongly acidic solutions and yellow in basic solutions.

4. What color does methyl orange indicator turn in a basic solution?

  1. ARed
  2. BColorless
  3. CYellow
  4. DBlue
उत्तर दिखाएँ

उत्तर: C

Methyl orange turns yellow in basic (alkaline) solutions.

5. What is a natural indicator, extracted from lichens, commonly used in laboratories as litmus paper?

  1. AChina rose extract
  2. BRed cabbage extract
  3. CTurmeric
  4. DLitmus
उत्तर दिखाएँ

उत्तर: D

Litmus, derived from lichens, is the most common natural pH indicator, turning red in acids and blue in bases.

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