Single correct option
Consider the following statements about indicators:
1. Phenolphthalein is colourless in an acidic solution.
2. Methyl orange turns red in an acidic solution.
Which of the statements given above is/are correct?
1. Phenolphthalein is colourless in an acidic solution.
2. Methyl orange turns red in an acidic solution.
Which of the statements given above is/are correct?
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (C) Both 1 and 2
Phenolphthalein is colourless in acids and pink in bases, so statement 1 is correct. Methyl orange is red in acids and yellow in bases, so statement 2 is also correct. A frequent mix-up is to say that phenolphthalein turns pink in an acid.
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