प्रथम संक्रमण श्रेणी की धातु 'M' अपनी श्रेणी में उच्चतम परमाणुकरण एन्थैल्पी रखती है। इसका एक जलयोजित आयन \(\left(\mathrm{M}^{\mathrm{n} \dagger}\right)\) हरे रंग में मौजूद है। उपरोक्त \(\mathrm{M}^{\mathrm{n}-}\) आयन द्वारा निर्मित ऑक्साइड की प्रकृति _______ है।

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.