Cells of a substance change their colour on heating in a closed test-tube but regained after sometime when they were allowed to cool down name the substance and write its formula and explain the phenomenon involved
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a)Crystals of a substance changed their color on heating in a closed test tube but regained it after sometime when they were allowed to cool down. name the substance and write its formula and explain the phenomenon involved. b) Name the compound whose one formula unit is associated with 10 water molecules
Explanation:
· PHENOMENON :- the crystals of hydrated salts are heated, they lose their water of crystallisation which is responsible for its color. when it is left to cool down, it absorbs moisture from air and again gains its water of crystallisation and thus, also its color
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