Step 1: The task.
We must find the one match that is wrong among bacterial shapes and nutrition types.
Step 2: Check the shapes.
Round bacteria are called cocci, and rod-shaped ones are called bacilli. Both these matches are correct.
Step 3: Check Chromatium.
Chromatium is a purple sulphur bacterium that uses light to make food, so it is rightly called photoautotrophic. That match is correct.
Step 4: Check Rhodospirillum.
Rhodospirillum also uses light energy, so it is a photosynthetic, photoautotrophic or photoheterotrophic, bacterium. Calling it chemoautotrophic is wrong, because chemoautotrophs get energy from chemical reactions, not light.
Step 5: Spot the odd match.
True chemoautotrophs are forms like Nitrosomonas and sulphur bacteria. So the label chemoautotroph does not suit Rhodospirillum.
Step 6: Conclusion.
The wrong match is "Chemoautotrophic bacteria-Rhodospirillum". \[ \boxed{\text{Chemoautotroph - Rhodospirillum}} \]