The correct statement (s) about Cr2+ and Mn3+ is / are [atomic number of Cr = 24 and Mn =25]

(a). In aqueous solution Cr2+ (3d4) acts as a reducing agent, oxidising itself to Cr3+(3d3) that gives a completely half-filled t2g level in octahedral ligand field of H2O.(b). Mn3+(3d4) is an oxidising agent as it is reduced to Mn2+(3d5), a completely half-filled stable configuration.(c). Both Cr2+ and Mn3+ have d4 configuration.(d). 3d4Cr2+ and 3d4Cr2+aq→R.ACr3+aq+e−Hence (d) is wrong statement.

The correct statement (s) about Cr2+ and Mn3+ is / are [atomic number of Cr = 24 and Mn =25]

(a). In aqueous solution Cr2+ (3d4) acts as a reducing agent, oxidising itself to Cr3+(3d3) that gives a completely half-filled t2g level in octahedral ligand field of H2O.(b). Mn3+(3d4) is an oxidising agent as it is reduced to Mn2+(3d5), a completely half-filled stable configuration.(c). Both Cr2+ and Mn3+ have d4 configuration.(d). 3d4Cr2+ and 3d4Cr2+aq→R.ACr3+aq+e−Hence (d) is wrong statement.

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The correct statement (s) about Cr²⁺ and Mn³⁺ is / are [atomic number of Cr = 24 and Mn =25]

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Cr²⁺ is a reducing agent

Mn³⁺ is an oxidising agent

Both Cr²⁺ and Mn³⁺ exhibit d⁴ electronic configuration

when Cr²⁺ is used as a reducing agent, the chromium ion attains d⁵ electronic configuration

answer is A, B, C.

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Detailed Solution

(a). In aqueous solution Cr²⁺ (3d⁴) acts as a reducing agent, oxidising itself to Cr³⁺(3d³) that gives a completely half-filled t_2g level in octahedral ligand field of H₂O.

(b). Mn³⁺(3d⁴) is an oxidising agent as it is reduced to Mn²⁺(3d⁵), a completely half-filled stable configuration.

(c). Both Cr²⁺ and Mn³⁺ have d⁴ configuration.

(d). 3d⁴Cr²⁺ and $3 d^{4} C r^{2 +} (a q) \overset{R . A}{\to} C r^{3 +} (a q) + e^{-}$