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Water can be identified by the use of - JAMB Chemistry 1993 Question

Water can be identified by the use of?
A
anhydrous copper (II) tetraoxosulphate (VI)
B
anhydrous sodium trioxocarbonate (IV)
C
potassium heptaoxochromate (VII)
D
copper (II) trioxocaronate (IV)
correct option: a
Anhydrous CuSO4 will turn blue with water
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