MCQ
The pair in which both species have iron is
- ANitrogenase, cytochromes
- BCarboxypeptidase, haemoglobin
- CHaemocyanin, nitrogenase
- ✓Haemoglobin, cytochromes
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On the basis of standard electrode potential, predict which of the following reaction can not occur ?
Statement $I$: Aqueous solution of $K _2 Cr _2 O$, is preferred as a primary standard in volumetric analysis over $Na _2 Cr _2 O$, aqueous solution
Statement $II:$ $K _2 Cr _2 O$, has a higher solubility in water than $Na _2 Cr _2 O _7$
In the light of the above statements, choose the correct answer from the options given below:

Compound $'C'$ is