18 verified questions · ~16 minutes · answer key checked against the official NTA final key across multiple sources. Text-only questions (diagram-based excluded until they can be shown properly).
The correct order of [FeF₆]³⁻, [CoF₆]³⁻, [Ni(CO)₄] and [Ni(CN)₄]²⁻ complex species based on the number of unpaired electrons present is :
The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :
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