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Q233) Of ions Zn2+, Ni2+ and Cr3+ [ At No. Zn = 30, Ni=28, Cr=24] [ MP CEE 1996]




SOLUTION

Only Zn2+ ( d10 configuration) is colourless while Ni2+ (d8) and Cr3+ (d3) are coloured
Answer: (a)


Q234) Choose the correct answer of transition elements? [ MP PMT 1995]




SOLUTION


Answer: (c)


Q235) The unpaired electron in Ni2+ is ? [ Mp PMT 1995]



SOLUTION

Ni2+ = 3d8
∴ 2 unpaired electrons
Answer:(b)



Q236) On addition of NH4OH to a copper sulphate solution [ MP PMT 1995]



SOLUTION

Cu2+ + 4NH3 → [Cu(NH3)4]2+ ( deep blue complex)
Answer: (c)


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