Which of the following are the applications of common salt?
(i) It is used as preservative.
(ii) It is used for manufacture of Na metal and Cl2(g) by electrolysis in molten state.
(iii) It is used for manufacture of caustic soda.
(iv) It is used for manufacturing baking soda and washing soda by Solvay process.
1
(i), (ii) and (iii)
2
(i), (ii) and (iv)
3
(ii), (iii) and (iv)
4
All of the above