Which of the following reagent produces brown
color to brown yellow when given sample of salt
contain Cu[ll]radical ?
A
KI
B
KIO3
с
NaCl
D
Nal
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NaI
Explanation:
As the copper nitrate reacts with the sodium Iodide it produces a brownish yellow precipitate.
sodium iodide (NaI) is added to copper(II) nitrate(cu(NO3)2)
The result is a redox reaction where Cu 2+ oxidizes I- to I2 resulting a ye;llow precipitate of copper iodide and red iodine solution.
2Cu2+ + 4I- ==> I2 +2CuI
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