Advertisements
Advertisements
प्रश्न
What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?
Advertisements
उत्तर
Under the given conditions, cupric cyanide is initially generated, which then decomposes to provide cuprous cyanide and cyanogen gas. Cuprous cyanide subsequently dissolves in an excess of potassium cyanide to provide the complex K3[Cu(CN)4].
\[\ce{CuSO4 + 2KCN -> Cu(CN)2 + K2SO4 \times 2}\]
\[\ce{2Cu(CN)2 -> Cu2(CN)2 + (CN)2}\]
\[\ce{Cu2(CN)2 + 6KCN -> 2K3[Cu(CN)4]}\]
_____________________________________________________
\[\ce{2CuSO4 + 10KCN -> 2K3[Cu(CN)4] + 2K2SO4 + (CN)2}\]
So, the coordination entity formed is [Cu(CN)4]3−.
The CN− is a strong field ligand; the complex ion is highly stable and can’t dissociate to give copper ions. Hence, no precipitate of copper sulphide is formed when H2S(g) is passed through this solution.
संबंधित प्रश्न
Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complex:
K3[Co(C2O4)3]
Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complex:
[Mn(H2O)6]SO4
Predict the co-ordination No. of cs+ ion if `r_(Cs)^+` = 1.69Å and `r_(Cl)^-` = 1.81Å.
Write IUPAC names of the following compounds:
Write structures of compounds A, B and C in of the following reactions
Following compounds are given to you :
2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane
1) Write the compound which is most reactive towards SN2 reaction.
2) Write the compound which is optically active.
3) Write the compound which is most reactive towards β-elimination reaction.
Write the structures of compounds A, B and C in the following reactions:
Write structures of compounds A and B of the following reaction :
The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?
Which of the following complexes are heteroleptic?
(i) \[\ce{[Cr(NH3)6]^{3+}}\]
(ii) \[\ce{[Fe(NH3)4]Cl2]^+}\]
(iii) \[\ce{[Mn(CN)6]^{4-}}\]
(iv) \[\ce{[Co(NH3)4]Cl2]}\]
A coordination compound \[\ce{CrCl3.4H2O}\] precipitates silver chloride when treated with silver nitrate. The molar conductance of its solution corresponds to a total of two ions. Write structural formula of the compound and name it.
A complex of the type \[\ce{[M(AA)2X2]^{n+}}\] is known to be optically active. What does this indicate about the structure of the complex? Give one example of such complex.
Match the coordination compounds given in Column I with the central metal atoms given in Column II and assign the correct code:
| Column I (Coordination Compound) | Column II (Central metal atom) |
| A. Chlorophyll | 1. rhodium |
| B. Blood pigment | 2. cobalt |
| C. Wilkinson catalyst | 3. calcium |
| D. Vitamin B12 | 4. iron |
| 5. magnesium |
Which one of the following does not achieve an octet of electrons in the central atom?
The oxidation state of Fe in the brown ring complex [F3(H2O)5NO]SO4 is
According to IUPAC nomenclatures, sodium nitroprusside is named as
What are Homoleptic complexes?
The one that will show optical activity is: (en = ethane 1, 2-diamine)
Does ionization isomer for the following compound exist? Justify your answer.
\[\ce{Hg[Co(SCN)4]}\]
Explain the following, giving two examples:
Coordination polyhedron
