Practicing Success
Match List I with List II
Choose the correct answer from the option given below: |
A-I, B-II, C-IV, D-III A-IV, B-III, C-II, D-I A-IV, B-I, C-III, D-II A-IV, B-II, C-III, D-I |
A-IV, B-I, C-III, D-II |
The correct answer is 3. A-IV, B-I, C-III, D-II. Let us calculate the oxidation number of the central metal atom/ion in each of the given complexes: A. \([Co(NH_3)_5(NCS)](SO_3)\): Let the oxidation number of \(Co\) be \(x\) We know, Charge of \(NH_3\) ligand is \(0\) Charge of \(NCS\) ligand is \(-1\) Charge of \(SO_3\) ligand is \(-2\) The overall charge of the complex should be \(0\) Thus, \(x + 5(0) + (-1) + (-2) = 0\) or, \(x + 0 -1 -2 = 0\) or, \(x - 3 = 0\) or, \(x = 3\) Hence, the oxidation number of \(Co\) ion is \(+3\). B. \([Co(NH_3)_4Cl_2]SO_4\): Let the oxidation number of \(Co\) be \(x\) We know, Charge of \(NH_3\) ligand is \(0\) Charge of \(Cl\) ligand is \(-1\) Charge of \(SO_4\) ligand is \(-2\) The overall charge of the complex should be \(0\) Thus, \(x + 4(0) + 2(-1) + (-2) = 0\) or, \(x + 0 -2 -2 = 0\) or, \(x - 4 = 0\) or, \(x = 4\) Hence, the oxidation number of \(Co\) ion is \(+4\). C. \(Na_4[Co(S_2O_3)_3]\): Let the oxidation number of \(Co\) be \(x\) We know, Charge of \(Na\) is \(+1\) Charge of \(S_2O_3\) ligand is \(-2\) The overall charge of the complex should be \(0\) Thus, \( 4(1) + x + 3(-2) = 0\) or, \(4 + x + -6 = 0\) or, \(x - 2 = 0\) or, \(x = 2\) Hence, the oxidation number of \(Co\) ion is \(+2\). D. \([CO_2(CO)_8]\): Let the oxidation number of \(Co\) be \(x\) We know, Charge of \(CO\) is \(0\) Thus, \(2x + 8(0) = 0\) or, \(x = 0\) Hence, the oxidation number of \(Co\) is \(0\). So from these calculations it is clear that the correct answer is option 3. A-IV, B-I, C-III, D-II. |