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Q217) Which of the following ions will liberate iodine when treated with KI




SOLUTION

2Cu2+ + 4I- → 2CuI + I2
Answer: (a)


Q218) The colour of CuCr2O7 solution in water is green because... [ BiharCEE 1995]




SOLUTION

Cu2+ ions are blue and Cr2O72- ions are yellow in aqueous medium. thus composite colour is green colour
Answer: (d)


Q219) Which of the following ions having maximum magnetic moment? [ MP PMT 1995]



SOLUTION

option "b' have maximum unpaired electrons hence more magnetic moment
Answer:(b)



Q220) Which of the following compound turns black on addition of NH4OH? [ MP PMT 1995]



SOLUTION

Hg4Cl2 + 2NH3 → Hg (finely divided (black)+ NH2HgCl + NH4Cl
Answer: (b)


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