Recent questions tagged co-ordination-compound

Description : Mention any four characteristics of Co- Ordination Compound

Last Answer : (1) Hard ness of water is estimated by simple titration with Na2 EDTA.  (2) Extraction of metals like Ag and Au make use of complex formation .  (3) Purification of ... compounds  (4) Biological application like pigment formation photosynthesis, Chloropyll.  Haemoglobin pigment of blood . 

Description : What are difference between double salt and a complex salt.

Last Answer : (1) both double salts as well as complex are formed by the combination of two or more stable compounds in stiochometric ratio (2) They differ in the fact that double salts such as carnallite -KCl. MgCl2. 6H20 , Mohr's ... as [Fe (CN) 6]4 of K4 Fe (CN) 6 do not dissociate into Fe2+ and CN- ions 

Description : What is meant by unidentate , didentate and ambidentate ligands . give two example of each

Last Answer : When a legend is bound to a metal ion through a single diner atom, is said to be unidentate for ex- Cl- , H2O & NH3 When a legande can bound through two donor atoms as in H2N ... is said to be polydentate ligand which can ligate through two different atoms is called ambidenate ligand Ex-NO2, SCN 

Description : Write the IUPAC name of [CO (NH3 ) 4 B12] 2 [ZnCl4 ].

Last Answer : Ans. Tetraamminedibromocobalt (III) tetrachlorozincate (II) 

Description : Which vitamin is a complex compound of cobalt ? 

Last Answer : Ans. Vitamin B12 is a complex compound in which central metal atom is cobalt. 

Description : What is the hybridisation of central metal ion and shape of Wilkinson’s catalyst ?

Last Answer : Wilkinson’s catalyst is (PH3 P)3 RhCl. In this Rh has dsp² hybridisation and square planar shape.

Description : How many EDTA (lethylendiamine tetra acetic acid) molecules are required to make an octahedral complex with a Ca2+ ion.

Last Answer : EDTA is a hexadentate ligand therefore only one EDTA molecule is required to form octahedral complex. 

Description : Explain the reason behind a colour of some gem stone with the help of example.

Last Answer : The colours of many gem stones are due to the presence of transition metal ions & colour are produced due to d-d transition. For example the mineral corundum Al2O3 is colourless when pure but when ... in trace amounts various gem stones are formed. Ruby is Al2O3 containing about 0.5 - 1% Cr3+ .

Description : FeSO4 solution mixed with (NH4 ) 2 SO4 solution in 1 : 1 molar ratio gives the test of Fe2+ ion but CuSO4 solution mixed with aqueous ammonia in 1 : 4 molar ratio does not give the test of Cu2+ ion. Explain why ?

Last Answer : When FeSO4 and (NH4 ) 2 SO4 solution are mixed in 1 : 1 molar ratio, a double salt is formed. It has the formula FeSO4 (NH4 ) 2 SO4 . 6 H2O. In aqueous solution, the salt dissociates. When CuSO4 and NH3 are mixed in the molar ratio of 1 : 4 in solution, a complex [Cu (NH3 ) 4 ] SO4 is formed.

Description : A cationic complex has two isomers A & B. Each has one Co3+, five NH3 , one Br and one SO4 2 . A gives a white precipitate with BaCl2 solution while B gives a yellow precipitate with AgNO3 ... are the possible structures of the complexes A and B ? (a) Will the two complexes have same colour ?

Last Answer : (a) [CO (NH3 ) 5 Br] SO4 and [CO (NH3 ) 5 SO4 ] Br  (b) NO