Terminology, ligands and denticity, EAN

28 questions on Terminology, ligands and denticity, EAN from the Coordination Compounds chapter: 6 NEET level, 11 JEE Main, 11 JEE Advanced. Each one opens with its answer and solution.

• What is the oxidation state of cobalt in [Co(NH3)5Cl]^2+? NEET level
• The denticity of the oxalate ion, C2O4^2-, when it chelates a metal ion is NEET level
• Which of the following is an ambidentate ligand? NEET level
• The coordination number of iron in K4[Fe(CN)6] is NEET level
• The correct IUPAC name of K3[Fe(CN)6] is NEET level
• Use EAN = Z - (oxidation state) + 2x(number of ligands, all monodentate). The EAN of iron (Z=26) in [Fe(CN)6]^4- is NEET level
• Using EAN = Z - (oxidation state) + 2x(number of monodentate ligands), and the nearest noble gas being krypton (Z=36), which complex ion has an effective atomic... JEE Main level
• An octahedral cobalt(III) compound has the empirical formula CoCl3.5NH3. On adding excess AgNO3 solution to one mole of it, two moles of AgCl precipitate immedi... JEE Main level
• The correct IUPAC name of [Co(en)2(NO2)Cl]Br, with the nitro group bound through nitrogen, is JEE Main level
• Assertion: Oxalate is a bidentate ligand. Reason: Oxalate has four oxygen atoms, so it is tetradentate. JEE Main level
• The coordination number and the oxidation state of cobalt in [Co(en)2(C2O4)]^+ are respectively JEE Main level
• The complex [Co(NH3)5(NO2)]Cl2 can exist as an isomer in which the ligand is attached through oxygen. This type of isomerism is called JEE Main level
• Consider the isomers P = [Co(NH3)5Br]SO4 and Q = [Co(NH3)5(SO4)]Br. Which statement is correct? JEE Main level
• Match each complex ion in Column I with its EAN in Column II (use EAN = Z - oxidation state + 2x number of ligands). Column I: P [Fe(CN)6]^3- (Z=26); Q [PtCl6]^... JEE Main level
• How many geometrical isomers are possible for an octahedral complex of the type [Cr(H2O)3Cl3]? JEE Main level
• The compound [Pt(NH3)4Cl2]Cl2 is an octahedral Pt(IV) complex. When 0.010 mol of it is treated with excess aqueous AgNO3 (Ag =108, Cl =35.5), the mass of AgCl p... JEE Main level
• Which of the following pairs of compounds shows coordination isomerism? JEE Main level
• An octahedral cobalt(III) complex has composition CoCl3.4NH3. Its solution conducts like a 1:1 electrolyte, and excess AgNO3 precipitates exactly one mole of Ag... JEE Advanced level
• A platinum compound of composition PtCl4.2NH3 gives no precipitate with AgNO3 and has negligible conductivity in solution. Assuming an octahedral complex with m... JEE Advanced level
• A 0.020 mol sample of an octahedral cobalt(III) complex of composition CoCl3.nNH3 (ammonia monodentate) is treated with excess AgNO3 and gives 5.74 g of AgCl im... JEE Advanced level
• Which of the following statements about [Co(en)2Cl2]^+ (octahedral, en = ethane-1,2-diamine, bidentate) are correct? Use EAN = Z - oxidation state + 2x number o... JEE Advanced level
• Which of the following complex ions can show linkage isomerism? JEE Advanced level
• Which of the following statements about ligand denticity are correct? JEE Advanced level
• Using EAN = Z - oxidation state + 2x number of ligands (all monodentate; Z: Mn 25, Fe 26, Cu 29, Zn 30), which of the following complex ions have EAN equal to 3... JEE Advanced level
• Which of the following formula-name pairs are correct according to IUPAC rules? JEE Advanced level
• How many stereoisomers (geometrical plus optical) are possible for the octahedral complex ion [Co(en)(NH3)2Cl2]^+, where en is a symmetrical bidentate ligand? JEE Advanced level
• Assume [Pt(NH3)2(NO2)2] is square planar and each nitrite ligand can bind through N or through O. The total number of distinct isomers (geometrical and linkage)... JEE Advanced level
• Three isomers of formula CrCl3.6H2O differ in how many chloride ions are free. In the isomer which on treatment of one mole with excess AgNO3 gives two moles of... JEE Advanced level