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NDA 2016 GAT · General Knowledge · Acids, Bases and Salts · medium

Acids turn blue litmus paper red. 2. All bases are alkalis.

Single correct option

Consider the following statements:
1. Acids turn blue litmus paper red.
2. All bases are alkalis.
Which of the statements given above is/are correct?
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (A) 1 only

Acids turn blue litmus red, so statement 1 is correct. Alkalis are only those bases that dissolve in water, for example NaOH and KOH, while bases such as Cu(OH)₂ and Fe(OH)₃ are insoluble. Thus every alkali is a base but not every base is an alkali, making statement 2 false.
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Original question written in the NDA 2016 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake