Werner's theory, ligands, coordination number, denticity, chelation
- Out of the following complex compounds, which of the compound will be having the minimum conductance in solution? Answer: 1. [Co(NH₃)₃Cl₃] or 2. [Co(NH₃)₄Cl₂] Key idea: conductance in solution depends on the number of ions produced; a non-electrolyte giv... 1
- Given below are two statements :Statement I : [Co(NH_3)_6]^3+ is a homoleptic complex whereas [Co(NH_3)_4Cl_2]^+ is a heteroleptic complex.Statement II : Complex [Co(NH_3)_6]^3+ has only one kind of ligands but [Co(NH_3)_4Cl_2]^+ has more than one ki… Answer: 2. Both Statement I and Statement II are true. Key idea: a homoleptic complex has only one kind of ligand; a heteroleptic complex ha... 1
- Which complex compound is most stable? Answer: 4. [CoCl₂(en)₂]NO₃ Key idea: A chelating ligand makes a complex more stable (chelate effect). In [CoCl₂(en)₂]NO₃ , the ligand en (et... 1
- Homoleptic complex from the following complexes is : Answer: 2. Potassium trioxalatoaluminate (III) Key idea: A homoleptic complex has only one kind of ligand bonded to the metal. Potassium tri... 1
- Ethylene diaminetetraacetate (EDTA) ion is : Answer: 1. Hexadentate ligand with four "O" and two "N" donor atoms Key idea: EDTA ⁴⁻ is a hexadentate ligand. It has two nitrogen donor ato... 1
- Urea reacts with water to form A which will decompose to form B. B when passed through Cu^2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following ? Answer: 2. [Cu(NH ₃ ) ₄ ] ²⁺ Urea + water: NH₂CONH₂+2H₂O→(NH₄)₂CO₃ (A). On decomposition: (NH₄)₂CO₃→ 2NH₃+CO₂+H₂O ; B is NH₃ . NH₃ with math... 1
- Iron carbonyl, Fe(CO)_5 is Answer: 3. mononuclear Fe(CO)₅ contains one metal atom, so it is mononuclear. Dinuclear and polynuclear carbonyls like mathrmMn₂(CO)₁₀ and m... 1
- The correct order of the stoichiometries of AgCl formed when AgNO_3 in excess is treated with the complexes : CoCl_3.6NH_3, CoCl_3.5NH_3, CoCl_3.4NH_3 respectively is : Answer: 2. 3 AgCl, 2 AgCl, 1 AgCl Key idea: only ionisable (outside the coordination sphere) chloride precipitates with AgNO₃ . CoCl₃·6NH₃ =... 1
- An example of a sigma bonded organometallic compound is : Answer: 1. Grignard's reagent Key idea: in a sigma-bonded organometallic compound, a metal-carbon sigma bond is present. Grignard's reagent,... 1
- The correct increasing order of trans-effect of the following species is Answer: 1. CN^- > C₆H₅^- > Br^- > NH₃ Key idea: trans-effect series: strong pi-acceptors and strong sigma-donors are highest, while NH₃ is l... 1