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Chemistry · May / June 2016 · Paper 12 · Question 30

5070Preparation of salts

Hydrated sodium carbonate decomposes when heated in a Bunsen burner flame. Which equation shows this decomposition correctly?

  1. A2Na2CO3.10H2O(s) → 4Na(s) + 2CO2(g) + O2(g) + 10H2O(g)
  2. BNa2CO3.10H2O(s) → Na2CO3(s) + 10H2O(g)
  3. CNa2CO3.10H2O(s) → NaHCO3(s) + NaOH(s) + 9H2O(g)
  4. DNa2CO3.10H2O(s) → Na2O(s) + CO2(g) + 10H2O(g)

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Correct answer: B. Na2CO3.10H2O(s) → Na2CO3(s) + 10H2O(g)

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