The statements regarding the compounds of sodium are

i) The mixture of NaOH and CaO is used as decarboxylating agent

ii) aq. NaOH reacts with silicon to form water glass

→ NaOH + CaO mixture is called soda lime, and it is used for decarboxylation of carboxylic acid,and hence it is used for decarboxylation of carboxylic acid, and hence it is said to be decarboxylating agent

→ silicon reacts with aq.NaOH to form sodium silicate [Na₂SiO₃] which is said to be water glass
2NaOH + Si + H₂O → Na₂SiO₃ + 2H₂
2NaOH + SiO₂ → Na₂SiO₃ + H₂O