Which of the following statement is incorrect? (a) The effective component of bleaching powder i...

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Which of the following statement is incorrect?
(a) The effective component of bleaching powder is \( \mathrm{OCl}^{-} \).
(b) \( \mathrm{CaCO}_{3} \) is obtained when quick lime is heated with coke in an electric furnace.
(c) Anhydrous \( \mathrm{CaSO}_{4} \) is dead burnt plaster.
(d) \( \mathrm{BaCO}_{3} \) is obtained on fusion of \( \mathrm{BaSO}_{4} \) and \( \mathrm{Na}_{2} \mathrm{CO}_{3} \).
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