23. Among 3d series of elements name a metal
a) Which has maximum number of paired electrons in ground state.
b) Which is colourless in +1 oxidation state and coloured in +2 oxidation state.
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a)Zinc has max no of paired electrons in ground state(3d10 4s2)
b)Copper is colourless(3d10) in +1 oxidation and colored in +2(3d9)
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