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JAMB Chemistry 1980 Question 20

Question 20

Chemical Bonding

Which ONE of the following statements is true?

  1. A.All alkali metal salts dissolve with dissociation in water
  2. B.Most ionic substances are easily vaporized.
  3. C.Ionic substances exist only as liquids.
  4. D.Non-ionic substances are good electrolytes
  5. E.Nitrogen exists in a trivalent state in ammonium salts.
Show the answer and explanation

Answer: A (All alkali metal salts dissolve with dissociation in water)

Explanation

Alkali metal salts are soluble ionic compounds that separate into ions in water. Ionic solids have high boiling points, non-ionic substances are poor electrolytes, and nitrogen forms four bonds in NH4+.