Double salts are addition compounds which lose their identity in aqueous solution whereas complexes which are also addition compounds do not lose their identity in aqueous solution. The coordination compounds show isomerism and find applications in photography, qualitative analysis, metallurgy, water purification and in the treatment of various diseases.
(i) Which of the following statements is incorrect ?
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(i) It is homogeneous catalyst for hydrogenation of alkenes.
(ii) 
cis - trans -
It shows geometrical isomerism but not optical isomerism due to the presence of at least one plane of symmetry.[Co(NH 3 ) 4 Br 2 ]NO 2 and [Co(NH 3 ) 4 BrNO 2 ]Br are ionisation isomers and later complex reacts with AgNO 3 solution to give pale yellow precipitate. [Co(NH 3 ) 4 BrNO 2 ]Br and [Co(NH 3 ) 4 BrONO] Br are linkage isomers.
(iii) 
trans-form is optically inactive because it is achiral.
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