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Periodic Properties and Chemical Bonding

*** Mrs. Shallu Aggarwal Contact #. 2230216 Mobile #. 98152-08983 ***

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Questions:1. Which of the following species are hypervalent?

(a) 1, 2, 3 (b) 1, 3 (c) 3, 4 (d) 1, 22. The decreasing order of polarity of the bond in NH3, PH3, AsH3

and SbH3 is in the order(a) NH3 > PH3 > AsH3 > SbH3

(b) SbH3 > AsH3 >PH3 > NH3

(c) NH3 > AsH3 > PH3 > SbH3

(d) NH3 > SbH3 > AsH3 > PH3

3. The substance with highest boiling point out of the following H2,He, Ne, Xe, CH4 is(a) Xe (b) CH4 (c) Ne (d) H2

4. The expected shape of Br3- ion is

(a) Linear (b) Trigonal Planar(c) Pyramidal (d) Angular5. Arrange the following in the increasing order of melting points.(i) NH3 (ii) CH3NH2 (iii) (CH3)2 NH (iv) (CH3)3N

6. The hybridization of phosphorus in POCL3 is the same as(a) P in PCI3 (b) S in SF4 (c) CI in CIF4 (d) B in BCI3

7. Sum of first three ionizations energies of A1 is 53.03 eV atom -

1and the sum of first tow ionization energies of Na is 52.20 eV atom-1 Out of A1 (III) and Na(II)(a) Na (II) is more stable than A1 (III)(b) A1 (III) is more stable than Na (II) (c) Both are equally unstable(d) Both are equally stable.8. If the first ionization energy is helium is 2.372 Mj/mole, the first ionization energy of neon in Mj/mole is:(a) 0.09 (b) 2.37 (c) 2.08 (d) 2.889. The boiling point of ICI is nearly 400C greater than that of Br2

although both these substances have nearly same molecular mass. This is because(a) ICI is an unsymmetrical molecule(b) I-C1 bond is stronger than Br-Br bond(c) ICI is a polar molecule(d) Of inert pair effect.10. Which of the following species has the largest energy of separation for its ion-pair?(a) NaC1 (b) NaBr (c) LiC1 (d) KI11. The correct increasing bond angle among BF3,PF3, and CIF3

follows the order(a) (b)

(c) (d) 12. Which is wrong statement?(a) The decreasing order of bond angle is

.(b) The decreasing order of bond angle is

.(c) The decreasing order of bond dissociation energy is

.(d) The decreasing bond angle is CH4 > NH3 >H2O13. Which is correct statement?As the s-character of a hybrid orbital decreases(i) The bond angle is decrease (ii) The bond strength is increase(iii) The bond length increases (iv) Size of orbital increases.(a) (i), (iii) and (iv) (b) (ii), (iii) and (iv)(c) (i) and (ii) (d) All are correct14. Which has maximum covalent character?(a) LiF (b) LiC1 (c) LiBr (d) LiI15. Which has maximum ionic mobility?(a) (b) (c) (d) 16. Correct order of decreasing second ionization potential of C, N, O and F is(a) C > N > O > F (b) O > N > F > C(c) O > F > N > C (d) F > O > N > C17. The electronic configuration of four elements are(i) 1s2 (ii) 1s2 2s2 2p6 3s1 (iii) 1s2 2s2 2p5 and (iv) 1s2 2s2 2p6. The one which is capable of forming ionic as well ascovalent bonds is (a) I (b) II (c) III (d) IV

18. In PO4-3, P-O bond order is

(a) 1.25 (b) 2 (c) -0.75 (d) -319. Maleic acid is stronger than fumaric acid because(a) Maleic acid is a cis isomer while fumaric acid is trans.(b) Maleic ion is stabilized by chelation while fumaric ion is not.(c) Maleic acid has less ka value.(d) none.20. CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is(a) U (b) 2U (c) 4U (d) U/221. Which order is/are correct?(i) Thermal stability:

(ii) Basic nature:

(iii) Solubility in water:

(iv) Melting point:

(a) (i), (iv) (b) (i), (ii), (iii)(c) (ii), (iii) (d) All are correct22. The correct order of increasing covalent character of the following is:

23. The first I.E of lithium is 5.41 eV and first electron affinity of Cl is 3.61eV. Calculate in kJ mol-1 for the reaction:

(a) 133.6 kJ (b) 347.4 kJ(c) 173.7 kJ (d) None24. Mg2C3 reacts with water forming propyne.

(a) One sigma and two Pi bonds(b) Three sigma and one Pi bonds(c) Two sigma and one Pi bonds(d) Two sigma and three Pi bonds.

25. Bond energy of H-H, F-F and H-F bonds are 104,38 and 135 kcal mol-1 respectively. Calculate resonance energy in H-F molecule (a) 197.86 kcal (b) 72.14 kcal (c) 133.6 kcal (d) None26. Which of the following molecules has 3-fold axis of symmetry?(a) C2H4 (b) NH3 (c) CO2 (d) SO2

27. A: CO2, B: Benzene, C: Tetracyanamethene, D: Buta-1,3-diene. Ratio of and bonds is in the order(a) A=C<D<B (b)A=C<B<D (c) A=B=C=D (d) A<B<C<D

28. In the reaction the change in

hybridization is from(a) sp3d to sp3 and sp3 d2 (b) sp3d to sp2 and sp3 (c) sp3d to sp3d2 and sp3d3 (d) sp3d2 to sp3 and sp3d

29. Which of the following elements with atomic numbers 26, 30, 56 and 80 has the highest vapour pressure at room temperature?(a) Z=30 (b) Z=26 (c) Z=56 (d) Z=80

30. The molecules that will have dipole moment (1) 2,2- Dimethy1propane(2) trans-pent-2-ene(3) cis-hex-3-ene(4) 2,2,3,3-Tetramethylbutane(a) 2,3 (b) 1,3 (c) 1,2,3 (d) All31. Which one of the following has zero dipole moment?(a) C1F (b) PCL3 (c) SiF4 (d) CFC13

32. Among the following species, identity the is structural pairs

*** Mrs. Shallu Aggarwal Contact #. 2230216 Mobile #. 98152-08983 ***

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NF3, NO , BF3, ,HN3

(b)

33. Arrange the following compounds in order of increasing dipole momentToulence (I), m-dichlorobenzene (II), o-dichlorobenzene(III),p-dichlorobenzene(IV)(a) I<IV<II<III (b) IV<I<II<III (c) IV<I<III<II (d) IV<II<I<III

34. KF combines with HF to form KHF2. The compound contains the species(a) K+, F- and H+ (b) K+,F- and HF (c) K+ and [HF2] - (d) [KHF]+ and F2

35. Among the following compounds the one that is polar and has the central atom with sp2

hybridization is

(a) (b) (c) (d)

36. Which contains both polar and non-polar bonds?

(a) (b) (c) (d)

37. Which one of the following compounds has sp2 hybridization?

(a) (b) (c) (d)

38. The incorrect statement among the following is:(a) The first ionization potential of AI is less than the first ionization potential of Mg.(b) The second ionization potential of Mg is greater than the second ionization potential of Na.(c) The first ionization potential of Na is less than the first ionization potential of Mg.(d) The third ionization potential of Mg is greater than the third ionization potential of AI.39. The correct order of increasing C – O bond length of CO,

, is

(a) (b)

(c) (d)

40. The correct order of radii is(a) (b) F- < O-2 < N-3

(c) (d) 41. Amongst , the one with the highest boiling point is(a) H2O because of hydrogen boning(b) H2 Te because of higher molecular weight(c) H2S because of hydrogen bonding(d) H2Se because of lower molecular weight42. The set representing the correct order of first ionization potential is(a) K > Na > Li (b) Be > Mg > Ca(c) B > C > N (d) Ge > Si > C43. The hybridization of atomic orbitals of nitrogen in

(a) sp2, Sp3 and sp2 respectively (b) sp, sp2 and sp3 respectively(c) sp2, sp and sp3 respectively (d) sp2, sp3 and sp respectively.44. The correct order of hybridization of the central atom in the following species NH3.

(a) dsp2, sp3d, sp2 and sp3 (b) sp3, dsp2, sp3d, sp2

(c) dsp2, sp2, sp3, sp3d (d) dsp2, sp3, sp2, sp3d45. Common feature among the species

(a) Bond order three and isoelectronic(b) Bond order three and weak field ligands

(c) Bond order two and -acceptors(d) Isoeletronic and weak field ligands.46. Indentify the least stable in amongst the following

(a) (b) (c) (d) 47. Specify the coordination geometry around and hybridization of N and B atoms in a 1: 1 complex of BF3 and NH3

(a) N : tetrahedral, sp2 ; B : tetrahedral, sp3 (b) N : pyramidal, sp3 ; B : pyramidal, sp3

(c) N : pyramidal, sp3 ; B : planar, sp2

(d) N : pyramidal, sp3 ; B : tetrahedral, sp3

48. The nodal plain in the -bond of ethene is located in (a) The molecular plane (b) A plane parallel to the molecular plane(c) A plane perpendicular to the molecular plane which bisects. The carbon-carbon bond at right angle(d) A plane perpendicular to the molecular plane which contains. The carbon-carbon bond.49. Property of alkaline earth metal that increases with their atomic number is(a) Ionization energy (b) Solubility of their hydroxides(c) Solubility of their sulphates(d) Electronegativity50. The statement that is not correct for periodic classification of elements is (a) The properties of elements are a periodic function of their atomic numbers(b)Non-metallic elements are less in number then metallic elements(c) The first ionization energies of element along a period do not vary in a regular manner with increase in atomic number(d) Forth transition elements, the d-subshells are field with electrons monotonically with increase in atomic number

*** Mrs. Shallu Aggarwal Contact #. 2230216 Mobile #. 98152-08983 ***