CBSE Class 12 · 2002 · Delhi; also All India Compartment · Coordination CompoundsShort Answer

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a) Write the chemical formulae of the following complexes:
i) Hexaammineplatinum(IV) chloride
ii) Tetraamminedichloridocobalt(III) ion
b) Using the valence bond theory of bonding in complexes, explain the geometry and magnetic nature of [Co(NH

_{3}

)

_{6}

]

^{3 +}

Answer: (a)(i) [Pt(NH₃)₆]Cl₄; (ii) [Co(NH₃)₄Cl₂]⁺. (b) Co³⁺(d⁶) pairs under strong-field NH₃ → d²sp³, octahedral, diamagnetic.

Solution

(a)(i)

[Pt (N H_{3})_{6}] C l_{4}

(ii)

[Co (N H_{3})_{4} C l_{2}]^{+}

(b) Co

^{3 +}

= 3d

^{6}

. NH

_{3}

(strong field) pairs the six electrons into three 3d orbitals, vacating two; these with 4s and three 4p hybridise as d

^{2}

^{3}

, accepting six NH

_{3}

lone pairs.
Geometry: octahedral (inner-orbital).
Magnetic nature: all electrons paired → diamagnetic.

CBSE Class 12 Board · 2002 · Delhi; also All India Compartment · Subjective

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CBSE Class 12 · 2002 · Delhi; also All India Compartment · Coordination CompoundsShort Answer

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