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Which of the following reaction is used in white washing of walls?

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Which of the following reaction is used in white washing of walls?

(a) 2Ca + O2 → 2CaO

(b) CaO + H2O → Ca(OH)2

(c) Ca(OH)2 + CO2 → CaCO3 + H2O

(d) Ca(OH)2CaO + H2O

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(c) Ca(OH)2 + CO2 → CaCO3 + H2O

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