The reaction $CaCO_3 \rightleftharpoons CaO + CO_2$ goes to completion in an open vessel because:

  • A
    $CaO$ does not react with $CO_2$ to give $CaCO_3$
  • B
    The backward reaction is very slow
  • C
    $CO_2$ formed escapes out
  • D
    None of these

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