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Crystals of a substance changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. Identify the formula of that crystalline solidA. `Na_2CO_3` . `10H_2O`B. `CaSO_4`.`2H_2O`C. `CuSO_4`. `5H_2O`D. none of these |
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Answer» Correct Answer - C |
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