Choose the correct option regarding the uses of washing soda:
It is used to manufacture glass.
Washing soda (Na2CO3) is used to manufacture glass.
Sodium chloride(NaCl) is used to make the freezing mixture.
Gypsum(CaSO4⋅2H2O) is used to manufacture cement.
Blue vitriol or copper sulphate(CuSO4⋅5H2O) is used as a fungicide.