MCQ ON CHEMICAL BONDING

Coordinate covalent compounds are formed by [CPMT 1990, 94] (a) Transfer of electrons (b) Sharing of electrons (c) Donation of electrons (d) None of these process In the coordinate valency [CPMT 1989] (a) Electrons are equally shared by the atoms (b) Electrons of one atom are shared with two atoms (c) Hydrogen bond is formed (d) None of the above Which of the following contains a coordinate covalent bond [MNR 1990; IIT 1986] (a) (b) (c) (d) A coordinate bond is formed when an atom in a molecule has [CBSE PMT 1992] (a) Electric charge on it (b) All its valency electrons shared (c) A single unshared electron (d) One or more unshared electron pair Which has a coordinate bond [RPMT 1997] (a) (b) (c) (d) The compound containing co-ordinate bond is [AFMC 1999; Pb. CET 2002] (a) (b) (c) (d) All of these Which forms a crystal of [CPMT 1972; NCERT 1976; DPMT 1996] (a) molecules (b) and ions (c) and atoms (d) None of the above When sodium and chlorine reacts then [NCERT 1973] (a) Energy is released and ionic bond is formed (b) Energy is released and a covalent bond is formed (c) Energy is absorbed and ionic bond is formed (d) Energy is absorbed and covalent bond is formed Which one is least ionic in the following compounds [CPMT 1976; BHU 1998] (a) (b) (c) (d) The electronic configuration of four elements L, P, Q and R are given in brackets The formulae of ionic compounds that can be formed between these elements are [NCERT 1983] (a) and (b) and (c) and (d) and Electrovalent compound's [MP PMT 1984] (a) Melting points are low (b) Boiling points are low (c) Conduct current in fused state Insoluble in polar solvent A electrovalent compound is made up of [CPMT 1978, 81; MNR 1979] (a) Electrically charged molecules (b) Neutral molecules (c) Neutral atoms (d) Electrically charged atoms or group of atoms Electrovalent bond formation depends on (a) Ionization energy (b) Electron affinity (c) Lattice energy (d) All the three above In the following which substance will have highest boiling point [NCERT 1973; MP PMT 1990] (a) (b) (c) (d) An atom of sodium loses one electron and chlorine atom accepts one electron. This result the formation of sodium chloride molecule. This type of molecule will be [MP PMT 1987] (a) Coordinate (b) Covalent (c) Electrovalent (d) Matallic bond Formula of a metallic oxide is The formula of its phosphate will be [CPMT 1986, 93] (a) (b) (c) (d) From the following which group of elements easily forms cation (a) (b) (c) (d) Which type of compounds show high melting and boiling points [CPMT 1996] (a) Electrovalent compounds (b) Covalent compounds (c) Coordinate compounds (d) All the three types of compounds have equal melting and boiling points Lattice energy of an ionic compound depends upon [AIEEE 2005] (a) Charge on the ion only (b) Size of the ion only (c) Packing of ions only (d) Charge on the ion and size of the ion The values of electronegativity of atoms A and B are 1.20 and 4.0 respectively. The percentage of ionic character of A – B bond is [MP PET 2003] (a) 50 % (b) 43 % (c) 55.3 % (d) 72.24% is the symbol of ….. ion [EAMCET 2003] (a) Oxide (b) Superoxide (c) Peroxide (d) Monoxide The number of electrons that are paired in oxygen molecule is [IIT 1995] (a) 7 (b) 8 (c) 14 (d) 16 When goes to the bond distance ..... and when goes to the bond distance ....... [IIT 1996] (a) Decrease, increase (b) Increase, decrease (c) Increase, increase (d) None of these Which of the following contains a coordinate covalent bond [UPSEAT 2001] (a) (b) (c) HCl (d) Which combination is best explained by the co-ordinate covalent bond [JIPMER 2001; CBSE PMT 1990] (a) (b) Cl + Cl (c) (d) Arrange the following compounds in order of increasing dipole moment. (I) Toluene (II) dichlorobenzene (III) dichlorobenzene (IV) dichlorobenzene [IIT 1996] (a) (b) (c) (d) The correct order of dipole moment is [Roorkee 1999] (a) (b) (c) (d) Which of the following has the highest dipole moment [AIIMS 2002] (a) (b) (c) (d) Which of the following arrangement of molecules is correct on the basis of their dipole moments [AIIMS 2002] (a) (b) (c) (d) The type of hybrid orbitals used by the chlorine atom in is [IIT 1992] (a) (b) (c) (d) None of these Among the following species, identify the isostructural pairs, [IIT 1996] (a) and (b) and (c) and (d) and In the compound the bond is of the type [IIT 1999] (a) (b) (c) (d) The correct order of increasing bond length of is [IIT 1999] (a) (b) (c) (d) In the dichromate dianion [IIT 1999] (a) bonds are equivalent (b) bonds are equivalent (c) All bonds are equivalent (d) All bonds are non-equivalent Bond length of ethane (I), ethene (II), acetylene (III) and benzene (IV) follows the order [CPMT 1999] (a) (b) (c) (d) Hybridisation state of chlorine in is [RPET 1999] (a) (b) (c) (d) Molecular shapes of and are [IIT Screening 2000] (a) The same with 2, 0 and 1 lone pairs of electrons respectively (b) The same, with 1, 1 and 1 lone pairs of electrons respectively (c) Different, with 0, 1 and 2 lone pairs of electrons respectively (d) Different, with 1, 0 and 2 lone pairs of electrons respectively Structure of and hybridization of iodine in this structure are [UPSEAT 2001] (a) , Linear (b) , T-shaped (c) , Irregular tetrahedral (d) , Octahedral In which of the following the central atom does not use sp3 hybrid orbitals in its bonding [UPSEAT 2001, 02] (a) (b) (c) (d) The magnetic moment of is found to be 1.7 B.M. How many unpaired electron (s) is/are present per molecule [Orissa JEE 2003] (a) 1 (b) 2 (c) 3 (d) 4 and are converted into monocations and respectively. Which is wrong [CBSE PMT 1997] (a) In the bond weakens (b) In the bond order increases (c) In paramagnetism decreases (d) becomes diamagnetic The common features among the species , CO and are [IIT Screening 2001] (a) Bond order three and isoelectronic (b) Bond order three and weak field ligands (c) Bond order two and (-acceptors (d) Isoelectronic and weak field ligands The number of bonds in sulphur trioxide trimer is [IIT Screening 2001] (a) Three (b) Two (c) One (d) Zero Strongest intermolecular hydrogen bond is present in the following molecules pairs [IIT 1981; DCE 2000] (a) and (b) and (c) and (d) and A compound contains atoms The oxidation number of is is + 5 and is . Therefore, a possible formula of the compound is [CPMT 1988] (a) (b) (c) (d) Bonds present in is [IIT 1983; DCE 2001] (a) Electrovalent and covalent (b) Electrovalent and coordinate (c) Electrovalent, covalent and coordinate (d) Covalent and coordinate Which of the following is the correct electronic formula of chlorine molecule [CPMT 1971] (a) (b) (c) (d) In hybridization is (a) (b) (c) (d) In has hybridization [AIIMS 1987] (a) (b) (c) (d) All the above Which has the shortest bond length [NCERT 1982; CPMT 1989] (a) (b) (c) (d) The hybridization of in the linear complex is [CPMT 1985; BHU 1981] (a) (b) (c) (d) Experiment shows that has a dipole moment while has not. Point out the structures which best illustrate these facts [DPMT 1984; NCERT 1983; CPMT 1984] (a) (b) (c) (d) 1. (d) Covalent character depend on the size of cation and anion. 2. (a) In graphite all carbon atoms are -hybridised and have covalent bond. 3. (c) Silica has tendency to form long chain covalent structure such as carbon so it has giant covalent structure. 4. (a) All have linear structure. O = C = O, Cl – Hg – Cl, HCCH 5. (d) Similar atoms form covalent bond. 6. (a) Covalent bond forms when electronegativity difference of two atom is equal to 1.7 or less than 1.7 7. (b) NaCl is ionic crystal so it is formed by and ions. 8. (a) Bond formation is always exothermic. Compounds of sodium are ionic. 9. (a) According to Fajan’s rule ionic character is less. 10. (c) Valencies of L, Q, P and R is – 2, – 1, + 1 and + 2 respectively so they will form and . 11. (c) Electrovalent compounds are good conductor of heat and electricity in molten state or in aqueous solution. 12. (D) 13. (d) Electrovalent bond formation depends on ionization energy of cation, electron affinity of anion and on lattice energy. 14. (b) Because is electrovalent compound. 15. (c) is formed by electrovalent bonding. 16. (d) Valency of metal is + 2 by formula MO so its phosphate would be because valency of is – 3. 17. (b) Li, Na and K are alkali metals with low ionization energy and one electron in their outermost shell so they will form cation easily. 18. (a) Melting point and boiling point of electrovalent compounds are high due to strong electrostatic force of attraction between the ions. 19. (d) The value of lattice energy depends on the charges present on the two ions and distance between them. It shell be high if charges are high and ionic radii are small. 20. (d) We know that ionic characters or ionic characters = 72.24% 21. (C) 22. (c) Configuration of molecule is No. of pair are 7 so total no. of paired electrons are 14. 23. (C ) 24. (D) 25. (a) 26. (b) The correct order of increasing dipole moment is p-dichlorobenzene < Toluene < m-dichlorobenzene < o-dichlorobenzene. 27. (a) The dipole moment of and . Therefore the correct order of the dipole moment is . 28. (B) 29. (d) Ammonia molecule is more basic than nitrogen trifluoride and Boron trifluoride because ammonia molecule easily gives lone pair of electron. 30. (a) Chlorine atom in is hybridised but its shape is angular. 31. (c) [ and ] are pyramidal while [ and ] are planar. Hence answer (c) is correct. 32. (d) 33. (d) B.O. in CO i.e., is 3, that of is 2 while that of ion is 1.33. Since the bond length increases as the bond order decreases i.e. . Thus option (d) is correct. 34. (b) Dichromate dianion has following structure 6, bonds are equivalent. 35. (c ) 36. (b) is a type of molecule because it consist of three bonding pair and two lone pair of electrons hence this compound shows hybridization. 37. (d) 38. (c) 39. (a) does not show –hybridization because this compound is not formed. 40. (a) = 41. (d) has one unpaired electron so it would be paramagnetic. 42. (a) Each of the species has 14 electron so isoelectronic and shows bond order 3. B.O.. 43. (d) 44. ( c) 45. ( c) Trimer of . 46. (c) has electrovalent, covalent and coordinate bonds. . 47. (a) is the correct electronic formula of molecule because each chlorine has 7 electrons in its valence shell. 48. (a) has hybridisation, its shape is square planar. 49. (b) In HCHO, carbon is hybridized 50. (c) Because of the triple bond, the carbon-carbon bond distance in ethyne is shortest. 51. (b) The hybridisation of Ag in complex will be sp because it is a Linear complex. 52. (a) Structure of is linear while that of is i.e. bent structure so in resultant dipole moment is zero while that of has some value. CHEMICAL BONDING Mrs. SHALLU JINDAL AGGARWAL : (M)9878608983 ; H – H – O C O O S S S O O O O O O O O O Unpaired electron (( (( (( (( (( (( –hybridization