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JAMB Chemistry 1978 Question 49

Question 49

Periodic Table

Five compounds R, T, W, X, and Y form the following compounds: a basic hydride R.H, an acidic hydride YH, amphoteric oxide W2O3, XO2. Which of the elements is an alkali?

  1. A.R
  2. B.T
  3. C.W
  4. D.X
  5. E.Y.
Show the answer and explanation

Answer: A (R)

Explanation

Only reactive metals such as the alkali metals form basic (ionic) hydrides like NaH, so R is the alkali metal. YH is acidic like HCl.