NCERT Important Questions Class 10 Science
CBSE 2022-2023.
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
NCERT book extra.
Rama wanted her house to be whitewashed. She bought some quicklime from the market and dissolved it in water in a big tub. She noticed that the container became hot without any heating. Give reason for her observation with equation and name the product formed. What happens when it is applied on the walls?
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Quicklime reacts with water to form slaked lime (lime water). It is an exothermic reaction. That is why the container became hot.
CaO + 2H₂O ⟶ Ca(OH)₂ + Heat
When calcium hydroxide is applied on the wails, it reacts with atmospheric carbon dioxide to form calcium carbonate which gives a shining white coating on the walls.
Ca(OH) ₂ + CO₂ ⟶ CaCO₃ + H₂O