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Explanation:

1) Sodium Hydroxide (NaOH )- Colourless to pink

Lime water( Cao) - Colourless to pink

2)Both are basic in nature

3)Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. Thus in this procedure both solutions turns into pink

4)Pink colour of lime water disappears due to formation of water soluble calcium bicarbonate..

5) (I)CaO + CO2 > CaCO3

(II) NaOH + dil. HCl > NaCl + H20

6) Phenolphthalein is used as an indicator in acid–base titrations. It turns pink when added to basic solution and turns to colourless when acidic solution added