The correct order of enthalpy of hydration for the transition metal ions is · ABC26IN0644
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Compounds – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Hard
The correct order of enthalpy of hydration for the transition metal ions is
(a)$\mathrm{Cr}^{2+}>\mathrm{Mn}^{2+}>\mathrm{Co}^{2+}>\mathrm{Ni}^{2+}$
(b)$\mathrm{Ni}^{2+}>\mathrm{Co}^{2+}>\mathrm{Mn}^{2+}>\mathrm{Cr}^{2+}$
(c)$\mathrm{Ni}^{2+}>\mathrm{Co}^{2+}>\mathrm{Cr}^{2+}>\mathrm{Mn}^{2+}$
(d)$\mathrm{Cr}^{2+}>\mathrm{Mn}^{2+}>\mathrm{Ni}^{2+}>\mathrm{Co}^{2+}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Hydration enthalpies (kJ mol⁻¹): Ni²⁺ −2105 > Co²⁺ −1996 > Cr²⁺ −1904 > Mn²⁺ −1841 (CFSE double hump) (c).
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