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For aqueous solutions of which of the following substances could the concentration be determined by — Laboratory Chemistry Question

Question

For aqueous solutions of which of the following substances could the concentration be determined by visible spectrophotometry?
I Cr(NO3)3 II KMnO4 III Zn(NO3)2

A.

I only

B.

III only

C.

I and II only

✓ Correct
D.

I, II, III

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