Indicators — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Indicators MCQs with step-by-step solutions (6 questions). Part of Acids, Bases & Salts. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Indicators · medium · theory
An acid turns blue litmus paper:
A. green
B. blue
C. red ✓ Correct
D. colourless
Solution: Acids turn blue litmus red; bases turn red litmus blue.
Q2 — Indicators · medium · theory
A base turns red litmus paper:
A. yellow
B. blue ✓ Correct
C. red
D. colourless
Solution: Bases turn red litmus blue.
Q3 — Indicators · hard · theory
Phenolphthalein remains colourless in acidic solution but turns ______ in a basic solution:
A. red
B. pink ✓ Correct
C. yellow
D. blue
Solution: Phenolphthalein is colourless in acid and pink in base.
Q4 — Indicators · hard · theory
Methyl orange gives a ______ colour in an acidic solution:
A. yellow
B. green
C. red ✓ Correct
D. blue
Solution: Methyl orange is red in acid and yellow in base.
Q5 — Indicators · medium · theory
Which of the following is a natural indicator?
A. Turmeric ✓ Correct
B. Methyl orange
C. Universal indicator
D. Phenolphthalein
Solution: Turmeric (like red cabbage and china rose) is a natural indicator; the others are synthetic.
Q6 — Indicators · hard · theory
Substances like onion and vanilla, whose smell changes in acidic or basic media, are called:
A. olfactory indicators ✓ Correct
B. litmus
C. salts
D. universal indicators
Solution: Olfactory indicators show a change in odour to detect acids and bases.