MCQ on Chemical Bonding & Periodic Properties

Nature of the bond formed between two elements depends on the (a) Oxidation potential (b) Electronegativity (c) Ionization potential (d) Electron affinity Two elements and have following electronic configurations and . The expected compound formed by combination of and is [BHU 1990] (a) (b) (c) (d) Electricity do not pass through ionic compounds (a) In solution (b) In solid state (c) In melted state (d) None of these From the following which compound on heating readily sublimes (a) (b) (c) (d) Which one in the following contains ionic as well as covalent bond [IIT 1979; CPMT 1983; DPMT 1983] (a) (b) (c) (d) The solution of sugar in water contains [NCERT 1972; MP PET 2000] (a) Free atoms (b) Free molecules (c) Free ions (d) Free atoms and free molecules In which of the following reactions, there is no change in the valency [NCERT 1974; CPMT 1971, 78] (a) (b) (c) (d) The octet rule is not followed in [BHU 1981] (a) (b) (c) (d) Sodium chloride is an ionic compound whereas hydrogen chloride is a gas because [KCET 2002] (a) Sodium is reactive (b) Covalent bond is weaker than ionic bond (c) Hydrogen chloride is a gas (d) Covalent bond is stronger than ionic bond Which one of the following molecules has a coordinate bond [CPMT 1988, 94] (a) (b) (c) (d) Co-ordinate bond is absent in [RPMT 2002] (a) (b) (c) (d) The dipole moment of chlorobenzene is 1.73 D. The dipole moment of -dichlorobenzene is expected to be [CPMT 1991] (a) 3.46 D (b) 0.00 D (c) 1.73 D (d) 1.00 D Polarization of electrons in acrolein may be written as [IIT 1988] (a) (b) (c) (d) The order of dipole moments of the following molecules is [Roorkee 2000] (a) (b) (c) (d) The electronegativity of and are 2.5, 2.1, 3.5, 3.0 and 2.5 respectively. Which of the following bond is most polar [EAMCET 1986] (a) (b) (c) (d) Which of the following bond has the most polar character [DPMT 1982; CBSE PMT 1992; CPMT 1999] (a) (b) (c) (d) The geometry of and its dipole moment are [IIT 1999] (a) Angular and non-zero (b) Angular and zero (c) Linear and non-zero (d) Linear and zero How many and bonds are there in the molecule of tetracyanoethylene [NCERT 1980; MP PMT 1986, 95;Orissa JEE 1997] (a) Nine and nine (b) Five and nine (c) Nine and seven (d) Five and eight The shape of ion is [EAMCET 1993; CPMT 2001] (a) Linear (b) Angular (c) Trigonal planar (d) Triangular pyramidal The hybridization in sulphur dioxide is[IIT 1986; DPMT 1990] (a) (b) (c) (d) The number and type of bonds between two carbon atoms in are [IIT 1996] (a) One sigma and one pi bonds (b) One sigma and two pi bonds (c) One sigma and one and a half pi bonds (d) One sigma bond Which of the following resonating structures of is the most contributing [Roorkee Qualifying 1998] (a) (b) (c) (d) The hybridization of atomic orbitals of nitrogen in , , and are [IIT Screening 2000] (a) and respectively (b) and respectively (c) and respectively (d) and respectively The molecule having one unpaired electron is [IIT 1985; MP PMT 1989] (a) (b) (c) (d) The geometry of according to valence shell electron pair repulsion (VSEPR) theory will be [KCET 1996; MP PET 1997] (a) Planar triangle (b) Pyramidal (c) Tetrahedral (d) Square planar Which of the following halogens has the highest bond energy [CPMT 1988] (a) (b) (c) (d) What bond order does have [Pb. PMT 2001] (a) 3 (b) 2 (c) 1 (d) 1/2 In the process, the electron lost is from [Orissa JEE 2002] (a) Bonding (-orbital (b) Antibonding (-orbital (c) orbital (d) orbital The maximum number of hydrogen bonds formed by a water molecule in ice is [MP PET 1993; AFMC 2002;UPSEAT 1999, 2001, 02] (a) 4 (b) 3 (c) 2 (d) 1 Hydrogen bonding is not present in [AIIMS 1998; MP PET/PMT 1998] (a) Glycerine (b) Water (c) Hydrogen sulphide (d) Hydrogen fluoride The bonds in are [EAMCET 1991] (a) All ionic (b) All covalent (c) Ionic and covalent (d) Ionic, covalent and coordinate covalent In which of the following ionic, covalent and coordinate bonds are present [UPSEAT 2002] (a) Water (b) Ammonia (c) Sodium cyanide (d) Potassium bromide If the difference in electronegativities of two elements is very large, then (a) The bond is 50% ionic (b) The bond is 100% covalent (c) The bond is more covalent than ionic (d) The bond is more ionic than covalent Which of the following elements will have the lowest electron affinity (a) Nitrogen (b) Flourine (c) Chlorine (d) Phosphorus The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is [IIT-JEE 1981; CBSE PMT 1991; MADT Bihar 1995; MP PMT 2003] (a) C > N > O > F (b) O > N > F > C (c) O > F > N > C (d) F > O > N > C Which of the following species has the highest ionisation potential [EAMCET 1998] (a) (b) (c) (d) Which of the following elements are analogous to the lanthanides [AIIMS 1998] (a) Actinides (b) Borides (c) Carbides (d) Hydrides Which of the order for ionisation energy is correct [CPMT 1999; CBSE PMT 2001] (a) (b) (c) (d) Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was [CBSE PMT 1989] (a) Millikan's oil drop experiment (b) Moseley's work on -ray spectra (c) Bragg's work on -ray diffraction (d) Discovery of -rays by Rontgen Which one of the elements is most metallic [MP PMT 2002] (a) P (b) As (c) Sb (d) Bi For a p - block element, its 3d, 3s, 3p and 4s orbitals are completely filled and the differentiating electron goes to the 4p orbital. The element should have its atomic number in the range (a) 13 - 18 (b) 21 - 26 (c) 31 - 36 (d) 49 - 54 The most common lanthanide is [AFMC 1995] (a) Lanthanum (b) Cerium (c) Samarium (d) Plutonium In a period, elements are arranged in strict sequence of [CPMT 1989] (a) Decreasing charges in the nucleus (b) Increasing charges in the nucleus (c) Constant charges in the nucleus (d) Equal charges in the nucleus Some of the polar crystal when heated produce electric current. This phenomena is termed as [AMU 2001] (a) Ferroelectric effect (b) Phyroelectric effect (c) Antiferroelectric effect (d) Piezoelectric effect Which of the following pairs has elements containing same number of electrons in the outermost orbit [CPMT 1985] (a) (b) (c) (d) Coinage metals are present in [DCE 2000] (a) s-block (b) d-block (c) p-block (d) f-block In which of the following metal carbonate which metal carbonate is decomposed on heating [UPSEAT 1999] (a) (b) (c) (d) Which one of the following is the correct decreasing order of boiling point [AMU 2000] (a) (b) (c) (d)  1. (b) If the two elements have similar electronegativities,the bond between them will be covalent, while a large difference in electronegativities leads to an ionic bond. 2. (a) From electronic configuration valencies of X and Y are + 2 and –1 respectively so formula of compound is . 3. (b) Ionic compounds can’t pass electricity in solid state because they don’t have mobile ion in solid state. 4. (d) sublimes readily on heating. 5. (c) Structure of KCN is . 6. (b) Sugar is an organic compound which is covalently bonded so in water it remains as free molecules. 7. (c) In the reaction valency is not changing. 8. (d) does not have octet, it has only six electrons so it is electron deficient compound. 9. (b) NaCl is a ionic compound because it consists of more elelctronegativity difference compare to HCl. 10. (a) has a coordinate bond besides covalent and ionic bonds 11. (b) has covalent bonds only. 12. (b) Due to symmetry dipole moment of p-dichloro benzene is zero. 13. (d) 14. (d) has zero dipole moment because of symmetric tetrahedral structure. has slightly higher dipole moment which is equal to 1.86D. Now has less electronegativity then . But has greater dipole moment than . 15. (a) More the difference in electronegativity of atoms. Bond between them will be more polar. 16. (d) bond has the most polar character due to difference of their electronegativity. 17. (a) has angular geometry and have some value of dipole moment. 18. (a) 9( and 9( bonds. 19. (d) has hybridization and its shape is triangular pyramidal due to lone pair on oxygen. 20. (c) molecule has hybridisation. 21. (b) In two carbons are joined with 1( and 2( bonds. 22. (a) In molecule structure is most contributed. 23. (b) The shape of and are linear trigonal planar and tetrahedral respectively. Thus the hybridization of atomic orbitals of nitrogen in these species are and respectively. 24. (a) NO has one unpaired electron with Nitrogen. 25. (b) 26. (b) Bond energy of is highest among all halogen molecule. Bond energies of are 37, 58, 46 and 36 Kcal respectively. 27. (c) have bond order one B.O.. 28. (b) Electron lost from antibonding ( orbital. 29. (a) In ice each water molecule forms four hydrogen bond through which each water molecule is tetrahedrally attached with other water molecule. 30. (c) Hydrogen bonding is present in molecules which have F, O, or N atoms. 31. (d) Structure of is 32. (c) Sodium cyanide contain ionic, covalent and coordinate bond. 33.(d) If the difference in electronegativities of two elements is very high then the bond is more ionic than covalent. 34. (d) Phosphorus have the lowest electron affinity due to half filled p orbital, but in nitrogen electron affinity is greater than phosphorus because of large nuclear attraction in comparison with phosphorus. 35. (c) The ionization potential increases across the period but the second ionization potential of oxygen is highest among them because after the removal of 1the 2 is to be removed from half filled orbital which is difficult. 36. (d) As, now the is to be removed from stable configuration. Li+ has the highest ionisation potential due to its stability. 37. (a) Actinides are homologous of Lanthanides. 38. (b) Ionisation energy increases across the period but due to stable half filled configuration of VA group, its I.E. is more than VI-A group. 39. (b) Moseley’s work on X-ray spectra was proved the significance of the atomic number. 40. (d) The metallic property of an element increases from top to bottom in group. 41. (c) 31– 36 ( to . 42. (b) The most common lanthanide is cerium. 43. (b) Increasing charges in the nucleus as atomic number increases across a period. 44. (d) This phenomena is called piezoelectric effect. 45. (d) Both belong to VII-A group having 7 in valence shell. 46. (b) Copper, Silver and Gold are coinage metals 47. (a) 48. (c) Correct decreasing order of boiling point is, > > > . Chemical Bonding & Periodic Properties Mrs. Shallu Jindal Aggarwal M:98786-08983 GENERAL ORGANIC CHEMISTRY 4 *** Mrs Shallu Aggarwal Mobile #. 98786-08983 *** O H H O H H H ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( ( H H H O H O H H H O H O H H O H O O H H