TNPSC Group 4 · 2019
133.
Which of the following are wrong?
I. Na₂CO₃ is used in softening hard water
II. NaHCO₃ is used for bleaching cotton and linen in textile industry
III. CaSO₄ ½ H₂O is used for plastering fractured bones
IV. CaOCl₂ is used in making of baking powder
Answer:
B.
II and IV