\[ \mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \underset{120^{\circ} \mathrm{C}}{\stackr...
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0\[
\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \underset{120^{\circ} \mathrm{C}}{\stackrel{\Delta}{\longrightarrow}} \mathrm{A}
\]
\[
\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O} \underset{\mathrm{A}}{\stackrel{200^{\circ} \mathrm{C}}{\longrightarrow}} \mathrm{B}
\]
In the above reaction, \( A \) and \( B \) are respectively
(A) \( \mathrm{CaSO}_{4}, \mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O} \)
(B) \( \mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O}, \mathrm{CaSO}_{4} \)
(C) \( \mathrm{CaSO}_{4} \cdot \frac{1}{2} \mathrm{H}_{2} \mathrm{O} \), Gypsum
(D) Gypsum, \( \mathrm{CaSO}_{4} \)
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