MCQ ON D & F BLOCK ELEMENTS, CO-ORDINATION CHEMISTRY

The equivalent weight of is half of its molecular weight when it is converted to (a) (b) (c) (d) In which compound chromium has oxidation state [CPMT 2003] (a) (b) (c) (d) None of these Which of the following metal does not show variable valency [RPET 2000] (a) (b) (c) (d) Which of the following metals will not react with solution of [CPMT 1974, 80; MH CET 2004] (a) (b) (c) (d) Which metal among following has strongest tendency to undergo oxidation [CPMT 1989] (a) (b) (c) (d) Which of the following has highest paramagnetic character (a) (II) (b) (II) (c) (II) (d) (II) Ammonia is a Lewis base. It forms complexes with cations. Which one of the following cations does not form complex with ammonia (a) (b) (c) (d) Which of the following is expected to form colourless complex [AMU 2000] (a) (b) (c) (d) Which of the following is ferromagnetic (a) (b) (c) (d) The most stable oxidation state of Mn is (a) +2 (b) +4 (c) +5 (d) +7 The number of unpaired electrons in is (a) 4 (b) 3 (c) 2 (d) Zero The correct order of ionic radii of and is [CBSE PMT 2003] (a) (b) (c) (d) (Atomic No. Y = 39, La = 57, Eu = 63, Lu = 71) One mole of potassium dichromate completely oxidises the following number of moles of ferrous sulphate in acidic medium [MP PET 1997] (a) 1 (b) 3 (c) 5 (d) 6 The atomic radii from to is almost identical because of (a) Increasing nuclear charge from to (b) Repulsion among increased electrons (c) Increased screening effect to nullify increased nuclear charge (d) All the above Oxidation number of in and in are respectively [MP PET 1991, 2001] (a) + 6 and + 7 (b) + 6 and + 6 (c) + 7 and + 7 (d) + 7 and + 6 When phosphine is passed through aqueous solution of copper sulphate, the product produced is (a) (b) (c) (d) Hydroxide soluble in ammonia is [NCERT 1973, 77; MNR 1984; KCET 1992] (a) (b) (c) (d) Which of the following pair of transitional elements exhibit highest and lowest density (a) and (b) and (c) and (d) and When an acidified solution of ferrous ammonium sulphate it treated with potassium permanganate solution, the ion which is oxidised is [BHU 1979] (a) (b) (c) (d) An, example for a double salt is [KCET 2002] (a) Potassium ferricyanide (b) Cobalt hexamine chloride (c) Cuprous sulphate (d) Mohr’s salt The complex furnishes [MP PET 1995] (a) 5 ions (b) 4 ions (c) 3 ions (d) 2 ions How many isomers are possible in [Orissa JEE 2004] (a) 2 (b) 4 (c) 6 (d) 1 (-bonding is not present in [MP PET 2003] (a) Grignard reagent (b) Dibenzene chromium (c) Zeise’s salt (d) Ferrocene Grignard reagent is a (a) Coordinate compound (b) Double salt (c) Organometallic compound (d) None of these Which one of the following complexes is paramagnetic [RPMT 1997] (a) (b) (c) (d) All of these The oxidation state of Fe in the complex is [MP PMT 2003] (a) –1 (b) +2 (c) +4 (d) Zero Which of the following is non-ionizable (a) (b) (c) (d) The coordination and oxidation number of X in the compound will be [JIPMER 1997; DCE 2004] (a) 6 and 4 (b) 10 and 3 (c) 2 and 6 (d) 6 and 3 In the number of unpaired electron is [BHU 2003] (a) 4.5 (b) 2 (c) 3 (d) 4 precipitate dissolves in ammonia due to the formation of [AIIMS 1991; MP PET 1993; CBSE PMT 1998] (a) (b) (c) (d) The oxidation number of cobalt in is [MP PMT 2001; J & K CET 2005] (a) +1 (b) –1 (c) +3 (d) –3 The complex salt can be made by the combination of with: [Pb. CET 2001] (a) (b) (c) (d) Which one of the following is an inner orbital complex as well as diamagnetic in behaviour (Atomic number : Zn = 30), Cr = 24, Co = 27, Ni = 28) [CBSE PMT 2005] (a) (b) (c) (d) The oxidation state of Fe in is [Pb. CET 2003; MP PET 2002] (a) +2 (b) –2 (c) +3 (d) +4 The number of moles of precipitate when excess of is added to one mole of is [EAMCET 1998] (a) Zero (b) 1.0 (c) 2.0 (d) 3.0 An anion solution gives a white ppt. With solution. The ppt. dissolves in dil. ammonia due to the formation of [MP PMT 1997] (a) (b) (c) (d) The diamagnetic specie is [AIIMS 2005] (a) (b) (c) (d) 1. (b) Equivalent wt. 2. (a) In has + 6 oxidation state. 3. (c) shows only + 2 valency. 4. (d) Because comes below in the electromotive series also standard electrode potential of and are: ; 5. (c) ; because of its high hydration energy. 6. (a) 5 unpaired element in d-subshell so it has highest paramagnetic. 7. (d) because it does not have vacant d-orbitals nor high nuclear charge and it does not belong to transition series. 8. (b) In (cuprous ion) d orbitals are completely filled so it will form colourless complex. 9. (d) The substances which are strongly attracted by magnetic field and show permanent magnetism even in absence of magnetic field are ferromagnetic e.g.. 10. (a) As half filled orbitals are more stable than partial filled ones. Therefore, + 2 is most stable oxidation state. 11. (a) 12. (c) Lanthanide contraction results in small size of , so 13. (d) Oxidation number of chromium in potassium dichromate is +6 so it oxidise 6 moles of ferrous sulphate in acidic medium. 14. (c) Increased screening effect to nullify increased nuclear charge. 15. (a) O.N. of O.N. of 16. (b) 17. (d) Due to formation of complex 18. (a) and 19. (c) 20. (d) Mohr’s salt () is a double salt. 21. (a) ⇌ . 22. (b) has 2 geometrical isomers & 2 optical isomers. Again Cis isomer can give 2 optical isomers. 23. (a) Grignard reagent is, . 24. (c) The organometallic compound of is known as Grignard reagent 25. (d) As all the ligands are weak so they do to induce pairing of electrons so they show paramagnetism. 26. (d) In , so oxidation number of is zero. 27. (a) Atoms present with in co-ordination sphere do not ionise. 28. (d) Co-ordination no. is 6 oxidation state in is 29. (b) O.N. of Ni = +2 Which has two unpaired electrons that is why it is paramagnetic. 30. (d) 31. (b) Oxidation number of Co . 32. (c) In the complex ion , charge on the complex ion Hence, it will combine with that species which have –2 charge to produce a neutral complex salt. So it will combine with to produce complex. 33. (c) O. N. of Due to paired it is diamagnetic. 34. (a) or Oxidation state of 35. (b) In this complex chloride ion in the form of ionic isomerism and show primary valency. is added in excess then result precipitation will occur. 36. (c) 37. (a) [Ni(CN)4]2– [NiCl4]2– [CoCl4]2– [CoF6]2– 3 D AND F BLOCK ELEMENTS,CO-ORDINATION CHEMISTRY Mrs. SHALLU JINDAL AGGARWAL : (M)9878608983 Mn Mn+2 CO en en en Cis isomer Cl Cl Trans isomer CO en en Cl Cl CO en en Cis isomer Cl Cl CO en en Trans isomer Cl Cl ↿⇂ ↿ ↿ ↿ ↿ ↿⇂ ↿⇂ ↿⇂ ↿ ↿ ↿ ↿ ↿⇂ ↿⇂ sp3 *** d2sp3 (Inner) ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿ ↿ ↿ ↿ diamagnetic paramagnetic paramagnetic paramagnetic