NaOH is used in the manufacture of:
Only pure fat and oil
Only soap and detergent
Only paper and artificial silk
All the above
NaOH is used in the manufacture of soap and detergent by reacting it with trigylcerides of oil and fat.
NaOH is used in the preparation of pure fat and oil.
They are also used in the manufacture of paper and artificial silk.
Therefore, all the statements are correct.