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JAMB Chemistry 1984 Question 4

Question 4

Chemical Formulae and Equations

Manganese (IV) oxide reacts with concentrated hydrochloric acid according to the equation MnO2 + xHCl → MnCl2 + Cl2 + yH2O. x and y are

  1. A.2 and 5 respectively
  2. B.2 and 4 respectively
  3. C.1 and 2 respectively
  4. D.4 and 2 respectively
  5. E.4 and 1 respectively
Show the answer and explanation

Answer: D (4 and 2 respectively)

Explanation

There are 4 Cl atoms on the right (2 in MnCl2, 2 in Cl2), so x = 4. The 2 O atoms from MnO2 (and the 4 H atoms) make 2H2O, so y = 2.