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Which equation correctly shows that all the O2 released comes from water?

  • (a) 6CO2 + 12H2O → C6H12O6 + 12O2 Your answer
  • (b) 6CO2 + 6H2O → C6H12O6 + 3O2 Your answer
  • (c) 6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 Correct
  • (d) 6CO2 + 6H2O → C6H12O6 + 6O2 Your answer
Your answer: Correct answer: (c)
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Explanation

Why (c) is correct

6CO2 + 12H2O → C6H12O6 + 6H2O + 6O2 uses 12 water molecules, so all 6 O2 (12 O atoms) can come from water.

Why the other options are wrong

  • (a) · your answer 12 O2 is too many; the oxygen atoms do not balance.
  • (b) · your answer 3 O2 is wrong and the equation does not balance.
  • (d) · your answer This balances, but with only 6 water molecules the 6 O2 cannot all come from water.
NCERT point: Using 12 H2O shows that the O2 comes from water.
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