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RRB Junior Engineer / DMS / CMA 2019 · Question 78 of 3719

What is the colour of base?

Chemistry - Acids and Bases

  1. Aa. Pink with phenolphthalein and yellow with methyl orangeCorrect
  2. Bb. Blue with phenolphthalein and yellow with methyl orange
  3. Cc. Yellow with phenolphthalein and pink with methyl orange
  4. Dd. Yellow with phenolphthalein and blue with methyl orange

Answer: A. a. Pink with phenolphthalein and yellow with methyl orange

Explanation

Phenolphthalein: • Chemical formula: C14 H20 O4 • It is a synthetic acid/base indicator. • It is colourless in acidic medium and turns to pink in basic medium. Methyl orange: • Chemical Formula: C14 H 14 N3 NaO3 S. • It is a synthetic indicator. • It turns orange-red in acidic medium and is yellow in basic medium.

Source: RRB JE 2019 CBT-1 (24-May-2019 Shift-2) — ixambee compilation with answer key and solutions · reliable-secondary

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