Question

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Answer 1

Q8 )

a) When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water.

b) When excess amount of CO2 is passed, the milkiness of the lime water disappears due to formation of Calcium bicarbonate.

c)

Ca(OH)2 + CO2 ---> CaCO3 + H2O

CaCO3 + H2O + CO2 ---> Ca(HCO3)2

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Q9)

a) Calcium hypochlorite  --- Formula: Ca(ClO)2

b) Bleaching powder is produced by passing chlorine gas through a test tube containing dry slaked lime. Reaction - Ca(OH)2+Cl2 --- > CaOCl2 + H2O

c)

• It is a strong oxidizing agent.

• It is used as a disinfectant.

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Q10)

Range of pH in which our body works is 7 - 7.5