NCERT Exemplar Class 12 Chemistry<\/a>. Here we have given NCERT Exemplar Class 12 Chemistry Chapter 9 Coordination Compounds. https:\/\/www.cbselabs.com\/ncert-exemplar-problems-class-12-chemistry-coordination-compounds\/<\/p>\nNCERT Exemplar Class 12 Chemistry Chapter 9 Coordination Compounds<\/h2>\n
Multiple Choice Questions<\/strong><\/p>\nSingle Correct Answer Type<\/strong><\/p>\nNCERT Exemplar Coordination Compounds Class 12<\/strong><\/p>\nQuestion 1. Which of the following complex formed by Cu2+ ions is most stable?<\/strong>
\n
\n Solution:<\/strong> (b) The greater the value of log K, the greater will be stability of complex compound formed.
\nFor reaction,
\n
\nFor this reaction, log K has highest value among the given four reactions. Hence, K will also be higher among these four, i.e., stability of the complexes will be highest among these four complexes.<\/p>\nQuestion 2. The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of<\/strong>
\n
\n Solution:<\/strong>
\n<\/p>\nCoordination Compounds NCERT Exemplar Class 12<\/strong><\/p>\nQuestion 3. When 0.1 mol COCl3<\/sub>(NH3<\/sub>)5<\/sub> is treated with excess of AgNO3<\/sub>, 0.2 mol of AgCl are obtained. The conductivity of solution will correspond to<\/strong>
\n (a) 1:3 electrolyte<\/strong>
\n (b) 1:2 electrolyte<\/strong>
\n (c) 1:1 electrolyte<\/strong>
\n (d) 3:1 electrolyte<\/strong>
\n Solution:<\/strong> (b) One mole of AgNO3<\/sub><\/strong> precipitates one mole of chloride ion. In the above reaction, when 0.1 mole COCl3<\/sub><\/strong>(NH3<\/sub><\/strong>)5<\/sub><\/strong> is treated with excess of AgNO3<\/sub><\/strong>, 0.2 mole of AgCl are obtained thus, there must be two free chloride ions in the solution of electrolyte.
\nSo, molecular formula of complex will be [CO(NH3<\/sub><\/strong>)5<\/sub><\/strong>Cl]Cl2<\/sub><\/strong> and electrolytic solution must contain [CO(NH3<\/sub><\/strong>)5<\/sub><\/strong>Cl]2+<\/sup><\/strong> and two CT as constituent ions. Thus, it is 1 : 2 electrolyte.
\n
\nHence, option (b) is the correct.<\/p>\nQuestion 4. When 1 mol CrCl3<\/sub>.6H2<\/sub>O is treated with excess of AgNO3<\/sub>, 3 mol of AgCl are obtained. The formula of the complex is<\/strong>
\n
\n Solution:<\/strong> (d) 3 mol of AgCl means 3Cl are given in the solution hence, the formula of the complex will be [Cr(H2<\/sub><\/strong>O)6<\/sub><\/strong>]Cl3<\/sub><\/strong>.<\/p>\nQuestion 5. The correct IUPAC name of [Pt(NH3<\/sub>)2<\/sub>Cl2<\/sub>] is<\/strong>
\n (a) diamminedichloridoplatinum (II)<\/strong>
\n (b) diamminedichloridoplatinum (IV)<\/strong>
\n (c) diamminedichloridoplatinum (I)<\/strong>
\n (d) dichloridodiammineplatinum (IV)<\/strong>
\n Solution:<\/strong> (a) [Pt(NH3<\/sub><\/strong>)2<\/sub><\/strong>Cl2<\/sub><\/strong>] is diamminedichloridoplatinum (II) .<\/p>\nQuestion 6. The stabilization of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?<\/strong>
\n
\n Solution:<\/strong> (c) Chelation (formation of cycle by linkage between metal ion and ligand) stabilizes the coordination compound. The ligand which chelates the metal ion are known as chelating ligand.
\nHere, only [Fe(C2<\/sub><\/strong>O4<\/sub><\/strong>)3<\/sub><\/strong>]3-<\/sup><\/strong> is a coordination compound which contains oxalate ion as a chelating ligand. Hence, it stabilizes coordination compound by chelating Fe3+<\/sup><\/strong> ion.<\/p>\nQuestion 7. Indicate the complex ion which shows geometrical isomerism.<\/strong>
\n
\n Solution:<\/strong>
\n<\/p>\nQuestion 8. The CFSE for octahedral [COCl6<\/sub>]4-<\/sup> is 18,000 cm-1<\/sup>. The CFSE for tetrahedral [COCl4<\/sub>]2-<\/sup> will be<\/strong>
\n (a) 18,000 cm-1<\/sup>(b) 16,000 cm-1<\/sup> (c) 8,000 cm-1<\/sup> (d) 20,000 cm-1<\/sup><\/strong>
\n Solution:<\/strong>
\n<\/p>\nQuestion 9. Due to the presence of ambidentate ligands coordination compounds<\/strong>
\n show isomerism. Palladium complexes of the type [Pd(C6<\/sub>H5<\/sub>)2<\/sub>(SCN)]2<\/sub> and [Pd(C6<\/sub>H5<\/sub>)2<\/sub>(NCS)2<\/sub>] are\u00a0<\/strong>
\n (a) linkage isomers (b) coordination isomers<\/strong>
\n (c) ionization isomers (d) geometrical isomers.<\/strong>
\n Solution:<\/strong> (a) The ligands having two different bonding sites are known as ambident ligands e.g., NCS, NO2<\/sub><\/strong>, etc.
\nHere, NCS has two binding sites at N and S.
\nHence, NCS (thiocyanate) can bind to the metal ion in two ways M <- NCS or M \u2014> SNC
\nThus, coordination compounds containing NCS as a ligand can show linkage isomerism i.e., [Pd(C6<\/sub><\/strong>H5<\/sub><\/strong>)2<\/sub><\/strong>(SCN)2<\/sub><\/strong> and [Pd(C6<\/sub><\/strong>H5<\/sub><\/strong>)2<\/sub><\/strong>(NCS)2<\/sub><\/strong>] are linkage isomers.
\nHence, correct choice is (a).<\/p>\nQuestion 10. The compounds [Co(SO4<\/sub>)(NH3<\/sub>)5<\/sub>]Br and [CO(SO4<\/sub>)(NH3<\/sub>)5<\/sub>]Cl represent<\/strong>
\n (a) linkage isomerism (b) ionization isomerism<\/strong>
\n (c) coordination isomerism (d) no isomerism.<\/strong>
\n Solution:<\/strong> (d) [Co(SO4<\/sub><\/strong>)(NH3<\/sub><\/strong>)5<\/sub><\/strong>]Br and [CO(SO4<\/sub><\/strong>)(NH3<\/sub><\/strong>)5<\/sub><\/strong>]Cl represent no isomerism because they are different compounds.<\/p>\nQuestion 11. A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?<\/strong>
\n (a) Thiosulphate (b) Oxalato<\/strong>
\n (c) Glycinato (d) Ethane-1, 2-diamine<\/strong>
\n Solution:<\/strong> (a) Thiosulphate or S2<\/sub><\/strong>O3<\/sub><\/strong>–<\/sup><\/strong>\u00a0is not a chelating agent since it is a monodentate ligand.<\/p>\nQuestion 12. Which of the following species is not expected to be a ligand?<\/strong>
\n (a) NO (b) NH4<\/sub>–<\/sup><\/strong>
\n (c) NH2<\/sub>CH2<\/sub>CH2<\/sub>NH2<\/sub> (d) CO<\/strong>
\n Solution:<\/strong> (b) Ligand must donate a pair of electrons or loosely held electron pair to metal and form a M – L bond,
\n<\/p>\nQuestion 13. What kind of isomerism exists between [Cr(H2<\/sub>O)6<\/sub>]Cl3<\/sub> (violet) and<\/strong>
\n [Cr(H2<\/sub>O)5<\/sub>Cl)Cl2<\/sub>.H2<\/sub>O (greyish- green)?<\/strong>
\n (a) Linkage isomerism (b) Solvate isomerism<\/strong>
\n (c) Ionisation isomerism (d) Coordination isomerism<\/strong>
\n Solution:<\/strong> (b) The given compounds havfe different number of water molecules inside and outside the coordinate sphere.<\/p>\nQuestion 14. IUPAC name of [Pt(NH3<\/sub>)2Cl(NO2<\/sub>)] is<\/strong>
\n (a) platinum diaminechloronitrite<\/strong>
\n (b) chloronitrito-N-ammineplatinum (II)<\/strong>
\n (c) diamminechloridonitrito-N-platinum (II)<\/strong>
\n (d) diamminechloronitrito-N-platinate (II).<\/strong>
\n Solution:<\/strong> (c) [Pt(NH3<\/sub><\/strong>)2Cl(NO2<\/sub><\/strong>)] is diamminechloridonitrito-N-platinum (II)<\/p>\nMore than One Correct Answer Type<\/strong><\/p>\nQuestion 15. Atomic number of Mn, Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?<\/strong>
\n Solution:<\/strong>
\n<\/p>\nQuestion 16. Atomic number of Mn, Fe, Co and Ni are 25, 26 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons?<\/strong>
\n (a) [MnCl6<\/sub>]3-<\/sup> (b) [FeF6<\/sub>]3-<\/sup> (c) [CoF6<\/sub>]3-<\/sup> (d) [Ni(NH3<\/sub>)6<\/sub>]2+<\/sup><\/strong>
\n Solution:<\/strong>
\n<\/p>\nQuestion 17. Which of the following options are correct for [Fe(CN)6<\/sub>]3-<\/sup> complex?<\/strong>
\n (a) d2<\/sup>sp3<\/sup> hybridisation<\/strong>
\n (b) sp3<\/sup>d2<\/sup>\u00a0hybridisation<\/span><\/strong>
\n (c) Paramagnetic<\/strong>
\n (d) Diamagnetic<\/strong>
\n Solution:<\/strong>
\n<\/p>\nQuestion 18. An aqueous pink solution of cobalt (II).chloride changes to deep biue on<\/strong>
\n addition of excess of HCl. This is because<\/strong>
\n (a) [Co(H2<\/sub>O)6<\/sub>]2+<\/sup> is transformed into [CoCl6<\/sub>]4-<\/sup><\/strong>
\n (b) [CO(H2<\/sub>O)6<\/sub>]2+<\/sup> is transformed into [COCl4<\/sub>]