Q.Write balanced chemical equation for the following processes

Step 1. (a) Heating calcium in oxygen: calcium combines directly with oxygen to give its monoxide -- 2Ca + O₂ → 2CaO.

Step 2. (b) Heating calcium carbonate: this is the lime-kiln decomposition of Section 5.6.1 -- CaCO₃ →(Δ)→ CaO + CO₂.

Step 3. (c) Evaporating a solution of calcium hydrogen carbonate: Ca(HCO₃)₂ is only stable in solution; on evaporation/heating it decomposes back to the carbonate, releasing water and CO₂ -- Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂ (the reverse of the lime-water-plus-excess-CO₂ reaction of Section 5.6.2). …

For each process, identify the reaction type (direct combination, thermal decomposition, or high-temperature reduction) using the calcium reaction chemistry of Sections 5.6.1-5.6 …

• Writing part (c) as simply 'CaCO3 -> CaO + CO2' -- the starting material specified is calcium HYDROGEN carbonate (bicarbonate) in solution, which decomposes back to the carbonate (not directly to the oxide) on evaporation. …