MCQ
Dead burnt plaster is :
- ✓$\text{CaSO}_4$
- B$\text{CaSO}_4.\frac{1}{2}\text{H}_2\text{O}$
- C$\text{CaSO}_4.\text{H}_2\text{O}$
- D$\text{CaSO}_4.2\text{H}_2\text{O}$
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$S _{8( s )}+ a OH ^{-}_{( aq )} \rightarrow b S ^{2-}_{( aq )}+ c S _{2} O _{3}{ }^{2-}{ }_{( aq )}+ d H _{2} O _{(\ell)}$
The values of $'a'$ is ............ (Integer answer)