Gypsum $CaSO_4 \cdot 2H_2O$ on heating to about $120 \, ^oC$ forms a compound which has the chemical composition represented by
- A$CaSO_4$
- B$2CaSO_4 \cdot H_2O$
- C$CaSO_4 \cdot H_2O$
- D$2CaSO_4 \cdot 3H_2O$
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The correct order of melting point for alkaline earth metals is:
Which of the following does not react with cold or hot water?
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