Question

a solution of a substance is used for white washing name them and write formula also​

Answer 1

Answer:

CaO

calcium oxide

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Answer 2

Answer:

Quick Lime or Calcium Oxide

Formula: CaO

Explanation:

Calcium Oxide, commonly known as quick lime in water is used for white washing. It's formula is CaO.

When it is dissolved in water, it forms calcium hydroxide and when this reacts with carbon-dioxide to form a white layer of calcium carbonate on it.

2Ca + O₂ ----> 2CaO

CaO + H₂O -----> Ca(OH)₂

Ca(OH)₂ + CO₂ -----> CaCO₃ + H₂O