Why Ni(OH)2 is coloured but Zn(OH)2 isn't?
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The nickel +2 cation is coloured so it imparts a colour to nickel hydroxide. Zinc +2 cation is white so the compound is not coloured too.
RUMELSHAHRIAR:
Thanks a lot , Cann you help me with another question?
Yes please
Why CdS is yellow? And HgO and HgS are Red?Although Cd is not Transition metal
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