The first transition series metal ' M ' has the highest enthalpy of atomisation in its series. One of its aquated ion ( M n + ) exists in green colour. The nature of the oxide formed by the above M n+ ion is :

Chemistry · d and f Block Elements

JEE Main 2025 — 7 April, Morning Shift — Question 10

The first transition series metal ' M ' has the highest enthalpy of atomisation in its series. One of its aquated ion $\left(\mathrm{M}^{\mathrm{n}+}\right)$ exists in green colour. The nature of the oxide formed by the above $\mathrm{M}^{\mathrm{n+}}$ ion is :

Option A:
amphoteric
Option B:
neutral
Option C:
basic
Correct
Option D:
acidic

Answer: C

Step-by-step solution

V has the highest enthalpy of atomisation ( $515 \mathrm{~kJ} / \mathrm{mol}$ ).

Its oxide will be basic in nature.

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Exam: JEE Main 2025
Paper: 7 April, Morning Shift
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Properties of compounds of 3d Series elements + Comparison between 3d, 4d, 5d

The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is

Answer: C

Step-by-step solution

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