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JAMB Chemistry 2007 Question 25

Question 25

Chemical Formulae and Equations

MnO2(s) + xHCl(aq) → MnCl2(aq) + yH2O(l) + zCl2(g)
In the equation above, what are the values of x, y, and z respectively?

  1. A.2, 1, 2
  2. B.4, 1, 2
  3. C.4, 2, 1
  4. D.1, 2, 1.
Show the answer and explanation

Answer: C (4, 2, 1)

Explanation

Balancing: MnO2 + 4HCl → MnCl2 + 2H2O + Cl2. Two O atoms need 2H2O, which needs 4H from 4HCl, and the 4 Cl give 2 in MnCl2 and 2 in Cl2.