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प्रश्न
Explain the following, giving two examples:
Coordination number
Explain with two examples of the following:
Coordination number
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उत्तर
It is the number of ligand donor atoms to which the metal is directly bonded. For example:
- [Cu(NH3)4]2+: In this complex, the coordination number of copper (Cu2+) is 4 because there are four ammonia (NH3) molecules bonded to the metal ion.
- [Fe(CN)6]4−: Here, the coordination number of iron (Fe2+) is 6, as six cyanide (CN−) ions are coordinated to the iron ion.
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Match the complex ions given in Column I with the colours given in Column II and assign the correct code:
| Column I (Complex ion) | Column II (Colour) |
| A. \[\ce{[Co(NH3)6]^{3+}}\] | 1. Violet |
| B. \[\ce{[Ti(H2O)6]^{3+}}\] | 2. Green |
| C. \[\ce{[Ni(H2O)6]^{2+}}\] | 3. Pale blue |
| D. \[\ce{(Ni(H2O)4 (en)]^{2+} (aq)}\] | 4. Yellowish orange |
| 5. Blue |
Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code:
| Column I (Compound) | Column II (Oxidation state of Co) |
| A. \[\ce{[Co(NCS)(NH3)5](SO3)}\] | 1. + 4 |
| B. \[\ce{[Co(NH3)4 CL2]SO4}\] | 2. 0 |
| C. \[\ce{Na4[Co(S2O3)3]}\] | 3. + 1 |
| D. \[\ce{[Co2(CO)8]}\] | 4. + 2 |
| 5. + 3 |
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