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प्रश्न
A coordination compound has the formula \[\ce{CoCl3.4NH3}\]. It precipitates silver ions as AgCl and its molar conductance corresponds to a total of two ions.
Based on this information, answer the following question:
- Deduce the structural formula of the complex compound.
- Write the IUPAC name of the complex compound.
- Draw the geometrical isomers of the complex compound.
उत्तर
(a) Because just one AgCl is created, only one chloride ion is precipitated, which equals one negative ion. As a result, the structural formula for the complex will be.
\[\ce{[Co(NH3)4Cl2]Cl}\]
(b) IUPAC name: tetraamminedichloridocobalt (Ill) chloride
(c) Geometrical isomers
\[\begin{array}{cc}
\phantom{..........}\ce{H3N\phantom{....}NH3\phantom{....}Cl\phantom{........}H3N\phantom{....}NH3\phantom{....}Cl\phantom{.........}H3N\phantom{....}Cl\phantom{....}NH3}\phantom{....}\\
\phantom{......}\backslash\phantom{.....}|\phantom{.....}/\phantom{..............}\backslash\phantom{.....}|\phantom{.....}/\phantom{..............}\backslash\phantom{.....}|\phantom{.....}/\phantom{}\\
\phantom{.........}\ce{Co\phantom{........................}Co\phantom{.......................}Co}\phantom{..}\\
\phantom{......}/\phantom{.....}|\phantom{.....}\backslash\phantom{..............}/\phantom{.....}|\phantom{.....}\backslash\phantom{..............}/\phantom{.....}|\phantom{.....}\backslash\phantom{}\\
\phantom{.........}\ce{H3N\phantom{.....}NH3\phantom{....}Cl\phantom{.........}Cl\phantom{.....}NH3\phantom{....}H3N\phantom{........}H3N\phantom{...}NH3\phantom{...}Cl}\phantom{.....}
\end{array}\]
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संबंधित प्रश्न
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
Which of the d-block elements may not be regarded as the transition elements?
Explain why transition elements form alloys.
Read the passage given below and answer the following question:
The transition metals when exposed to oxygen at low and intermediate temperatures form thin, protective oxide films of up to some thousands of Angstroms in thickness. Transition metal oxides lie between the extremes of ionic and covalent binary compounds formed by elements from the left or right side of the periodic table. They range from metallic to semiconducting and deviate by both large and small degrees from stoichiometry. Since electron bonding levels are involved, the cations exist in various valence states and hence give rise to a large number of oxides. The crystal structures are often classified by considering a cubic or hexagonal close-packed lattice of one set of ions with the other set of ions filling the octahedral or tetrahedral interstices. The actual oxide structures, however, generally show departures from such regular arrays due in part to distortions caused by packing of ions of different size and to ligand field effects. These distortions depend not only on the number of d-electrons but also on the valence and the position of the transition metal in a period or group.
In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.
Assertion: Cations of transition elements occur in various valence states.
Reason: Large number of oxides of transition elements are possible.
Why first ionisation enthalpy of Cr is lower than that of Zn?
The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why?
Match the properties given in Column I with the metals given in Column II.
| Column I (Property) | Column II (Metal) | |
| (i) | Element with highest second ionisation enthalpy |
(a) \[\ce{Co}\] |
| (ii) | Element with highest third ionisation enthalpy |
(b) \[\ce{Cr}\] |
| (iii) | \[\ce{M}\] in \[\ce{M(CO)6}\] is | (c) \[\ce{Cu}\] |
| (iv) | Element with highest heat of atomisation |
(d) \[\ce{Zn}\] |
| (e) \[\ce{Ni}\] |
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
(activation energy, Threshold energy, increased, lowered, partially, full, d-d transition, Benzoic acid, benzaldehyde)
Only those transition metal ions will be coloured which have ______ filled d-orbitals facilitating ______.
The element with atomic number 46 belongs to
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Oxidation states
