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JAMB Chemistry 1985 Question 12

Question 12

Acids, Bases and Salts

Some properties of chemical substances are mentioned below (i) sour taste (ii) slippery to touch (iii) yields alkaline gas with ammonium salts (iv) has pH less than 7 (v) turns phenolphthalein pink. Which of the above are NOT typical properties of alkalis?

  1. A.(i), (iv) and (v)
  2. B.(iv) and (v)
  3. C.(i) and (iv)
  4. D.(ii) and (v)
  5. E.(ii), (iii) and (iv)
Show the answer and explanation

Answer: C ((i) and (iv))

Explanation

A sour taste and a pH below 7 are properties of acids. Alkalis feel slippery, release ammonia from ammonium salts and turn phenolphthalein pink.