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Chemistry · Oct / Nov 2019 · Paper 12 · Question 21

5070Arrangement of elements

Part of the Periodic Table is shown with four elements, W, X, Y and Z. These are not the elements' actual symbols. [Periodic Table diagram with W, X, Y, Z] Some pairs of these elements may react to form compounds. Which formulae are correct?

  1. AWX and YZ
  2. BWY2 and WZ
  3. CWZ and XZ
  4. DX2Z3 and YZ

As printed in the paper

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Correct answer: B. WY2 and WZ

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