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JAMB Chemistry 1978 Question 9

Question 9

Chemical Formulae and Equations

An element X forms the following compounds with chlorine: XCl4, XCl3, XCl2. This illustrates the

  1. A.law of multiple proportions
  2. B.law of chemical proportions
  3. C.law of simple proportions
  4. D.law of conservation of mass
  5. E.law of definite proportions.
Show the answer and explanation

Answer: A (law of multiple proportions)

Explanation

The same two elements form several compounds, and the masses of chlorine combining with a fixed mass of X are in a simple ratio (4:3:2). That is the law of multiple proportions.