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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 5 of 43
Marks: +1, -0
Specify the oxidation numbers of the metals in the followingcoordination entities :
(i) [Co(H2O)(CN)(en)2]2+\text{(i) } \mathrm{[Co(H_2O)(CN)(en)_2]^{2+}}
 (ii) [CoBr2(en)2]+\text{ (ii) } \mathrm{[CoBr_2(en)_2]^{+}}
(iii) [PtCl4]2−\text{(iii) } \mathrm{[PtCl_4]^{2-}}
 (iv) K3[Fe(CN)6]\text{ (iv) } \mathrm{K_3[Fe(CN)_6]}
(v) [Cr(NH3)3Cl3]\text{(v) } \mathrm{[Cr(NH_3)_3Cl_3]}
Solution:  
(i) [Co(H2O)(CN)(en)2]2+:+3;\text{ } \mathrm{[Co(H_2O)(CN)(en)_2]^{2+}} : +3;
(ii) [CoBr2(en)2]+:+3\mathrm{[CoBr_2(en)_2]^{+}} : +3
(iii) [PtCl4]2−:+2\text{ } \mathrm{[PtCl_4]^{2-}} : +2;
(iv) K3[Fe(CN)6]:+3;\text{ } \mathrm{K_3[Fe(CN)_6]} : +3;
(v) [Cr(NH3)3Cl3]:+3\mathrm{[Cr(NH_3)_3Cl_3]} : +3
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