IGCSE Chemistry 0620/21/O/N/21 Q15


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15 X is a pink solid. Y is a blue solid.
When X is heated, water is produced and the solid turns blue.
When water is added to Y, the solid turns pink.

What are X and Y?

X                                                       Y
A anhydrous cobalt(II)          chloride hydrated cobalt(II) chloride
B hydrated cobalt(II)              chloride anhydrous cobalt(II) chloride
C anhydrous copper(II)           sulfate hydrated copper(II) sulfate
D hydrated copper(II)             sulfate anhydrous copper(II) sulfate

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Answer ( 1 )


    Ans: B (X: Hydrated cobalt(II) chloride,  Y:  Anhydrous cobalt(II) chloride)

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