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MHT CET202520 Apr 2025Evening ShiftChemistrys Block ElementsActual

Which of the following compound is used for preparation of quicklime?

Options

  1. ACaustic soda
  2. BSodium carbonate
  3. CCalcium carbonate
  4. DMagnesium carbonate

Correct answer

C. Calcium carbonate

Step-by-step solution

Quicklime (calcium oxide, CaO ) is industrially prepared through the thermal decomposition of calcium carbonate ( CaCO ₃ ), a process termed calcination. CaCO ₃(s) Heat CaO (s) + CO ₂(g) Calcium carbonate (limestone) decomposes at approximately 825^ C to yield quicklime and carbon dioxide. Evaluating the options: A: Caustic soda ( NaOH ) is a strong base, irrelevant to quicklime production. B: Sodium carbonate ( Na ₂ CO ₃ ) is washing soda, not used here. C: Calcium carbonate ( CaCO ₃ ) is the correct precursor. D:

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