For aqueous solutions of which of the following substances could the concentration be determined by visible spectrophotometry? (

For aqueous solutions of which of the following substances could the concentration be determined by visible spectrophotometry?
(P) `Cr(NO_(3))_(3)` (Q) `KMnO_(4)`
(R) `Zn(NO_(3))_(2)`
A. P only
B. R only
C. P and Q only
D. P,Q and R

For aqueous solutions of which of the following substances could the concentration be determined by visible spectrophotometry? (P) `Cr(NO_(3))_(3)` (Q

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