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(i) [Cr(en) 3 ] 3+ =Optical (ii) [Cr(NH 3 ) 4 ClBr]Br = geometrical (iii) [Cr(NH 3 ) 4 Br 2 l 2 SO 4 =geometrical

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Coordination Compounds

Short Answer Type

91. [Cu(NH₃)₄]²⁺ ion is coloured while [Cu(CN)]^3– ion is colourless. Why?

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92. Give the name of a sigma (a) bonded organo metallic compound.

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93. Identify the ligands in [Co(en)₂ ClONO]⁺.

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94.

What is the oxidation number of central atom in each of the following ?
(i) [Pt(NH₃)₆ Cl₄ (ii) Fe₄ [Fe(CN)₆]₃(iii) [Ni(CO)₄] (iv) Na[Hg(CN)₃]

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95. What is the coordination number of central metal atom in the following?
(i) [Pt(NH₃)₃]Cl (ii) K₃[Fe(C₂O₄]₃]
(iii) [Fe(EDTA)] (iv) [Rh{P(C₆.H₅)₃}₃]Cl

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96. State the kind of isomerism possible for the following:
(i) [Cr(en)₃]³⁺ (ii) [Cr(NH₃)₄ ClBr]Br (iii) [Cr(NH₃)₄ Br₂l₂SO₄

(i) [Cr(en)₃]³⁺ =Optical
(ii) [Cr(NH₃)₄ ClBr]Br = geometrical
(iii) [Cr(NH₃)₄ Br₂l₂SO₄ =geometrical

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97.

Give names of two complexes which are used in medicines.

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98.

Write down the IUPAC names of the following compounds:
(i) [Co(NH₃)₅ONO]Cl₂, (ii) K₃[Cr(CN)₆]

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99.

Through which atoms, C or O, the carbon monoxide ligand is attached to the central metal atoms in carbonyls?

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100.

Give one use of Ni(CO)₄.