CHEMISTRY

MCAT Physical Chemistry (UNIT–4 & 5)

1. Octet rule is not followed in the formation of:
(a) NF3 (b) H2S (c) CCl4 (d) PCl5
2. In NH3, the covalent bonds are formed due to:
(a) s-sp overlap (b) s-sp2 overlap (c) s-sp3 overlap (d) None
3. Ionic compounds do not show the phenomenon of isomerism because bond are:
(a) Direction and rigid (b) Non-directional and rigid
(c) Non-directional and non-rigid (d) All above
4. Which of the following molecules have unpaired electrons is bonding molecular
orbitals?
(a) N2 (b) O2 (c) B2 (d) F2
5. Which of the following has greater ionic character in it?
(a) HF (b) HCl (c) BF3 (d) CO2
6. Which of the following is a polar molecule?
(a) CCl4 (b) HCl (c) BF3 (d) CO2
7. Which one of the following correctly describes the shape of NH3 molecule?
(a) Tetrahedral (b) Pyramidal (c) Angular (d) Square planer
8. What number of unpaired electrons present in NH3?
(a) 0 (b) 1 (c) 2 (d) 3
9. Table show information about Q and R:
Protons Neutrons Electrons
Q 16 18 18
R 17 18 18
What are Q and R?
(a) +ve ions of some element (b) +ve ions of different element
(c) –ve ions of same element (d) –ve ions of different elements
10. The molecules listed below are of general formula XY n with n > 2. In which the Y –
X – Y angle greatest?
(a) BF3 (b) NH3 (c) CH4 (d) H2O
11. Maximum amount of energy is required to remove electron from which sub-shell of
the same shell.
(a) s (b) p (c) d (d) f
12. The ionization energy of Be is greater than B because:
(a) Be has greater number of protons than B
(b) Be has less shielding effect than B
(c) In Be electron is to be removed from “S” and in B from “P”
(d) Left to right ionization energy decreases
13. Trend of shielding effect form left to right in short periods.
(a) First increases than decreases (b) Increases
(c) Decrease (d) Remain same
14. Which of the following ions smaller is size?
(a) N3- (b) O2- (c) Mg2+ (d) Na1+
15. %age ionic character in NaCl is:
(a) 72% (b) 82% (c) 92% (d) 100%
16. Heat of reaction when one mole of nitrogen combines with one mole of oxygen to
yield nitrogen oxide, is:
(a) +25.58 kJ/mol (b) -41.6 kJ/mole (c) +180.51 kJ/mol (d) -393.7 kJ/mole

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 17. CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s), What is the type of this reaction?
(a) Non-spontaneous reaction (b) Spontaneous reaction
(c) Single displacement reaction (d) b + c
18. NH4Cl(s) NH 4(aq) + Cl –1(aq) ∆H = 16.2 kJ mole–1 What is the type of
+

this reaction?
(a) Spontaneous reaction (b) Non-spontaneous reaction
(c) Enothermic reaction (d) a + c
19. Which of the following is not the property of spontaneous process?
(a) It is uni-direction (b) Natural process
(c) It is real process (d) All spontaneous process are exothermic
20. All the combounds given below have given below have dipole moment except:
(a) CO (b) H2S (c) CH4 (d) SO2
21. The bond angle of NF3 is:
(a) 109.5o (b) 1075o (c) 104.5o (d) None
o
22. All the following molecules have bond angle 180 except:
(a) SnCl2 (b) CO2 (c) HgCl2 (d) BeCl2
23. Which one of the followings does not contain coordinate covalent bond?
(a) HC1O (b) HClO2 (c) PH4+ (d) [Fe(CO)5]
24. Which one of the following enthalpies is always exothermic process?
(a) ∆Hat (b) ∆Hn (c) ∆Hi (d) ∆Hd
25. Which of the following values of heat of formation indicates that the product is
most stable?
(a) – 97 kJ (b) – 231.6 Kj (c) + 21.4 kJ (d) + 70 kJ
26. Evaporation of water is:
(a) An exothermic change (b) An endothermic change
(c) A process where no heat changes occur (d) Non-spontaneous process
27. Which equation represents the change corresponding to the enthalpy of
atomization of iodine?
(a) ½ I2(s) I(g) (b) I2(l) 2I(g)
(c) I2(s) 2I(g) (d) I2(g) 2I(g)
28. The heat of neutralization of given reaction is -57kJ:
NaOH + HCl → NaCl + H2O
By using this information, what is the value for heat liberated in the following
neutralization reaction? Ba(OH)2 + 2HCl → BaCl2 + 2H2O
(a) – 57 kJ (b) – 76 kJ (c) – 114 kJ (d) – 228 kJ
29. For which one of the following equation does the enthalpy changes represents the
lattice energy of sodium chloride
(a) Na(s) + ½ Cl2(g) NaCl(s) (b) Na+ (aq) + Cl-(aq) NaCl(aq)
+ -
(c) Na (g) + Cl (g) NaCl(g) (d) Na+ (g) + Cl-(g) NaCl(s)
30. Which substance have ∆E = ∆H and no pressure volume work?
(a) Liquids only (b) Solids only (c) Gases only (d) Liquid and solids
31. At constant pressure, heat of reaction is represented by:
(a) ∆H (b) ∆E (c) ∆P (d) ∆V
32. Which is not an example of exothermic reaction?
(a) A + B C + D ΔH = -Heat (b) A + B C + D + Heat
(c) A + B – Heat C+D (d) A + B C + D – Heat
33. Which of the following is not exothermic reaction?
(a) Condensation of steam (b) Freezing of water
(c) Electrolysis of water (d) H+(aq)+ OH-(aq)→ H2O(l)
34. The value of enthalpy change for the process represented by the equation is equal
to:
Cl(g) + 1e– → Cl–(g)

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 (a) ∆Hi (b) ∆He (c) ∆Hat (d) ∆Hd
35. ∆Hc of carbon is – 394 kJ/mol, than what is ∆Hf for CO2?
(a) + 394 (b) – 394 (c) O (d) + 197
36. Which one of the following bonds is strongest?
(a) C – C (b) C – H (c) C – N (d) C – F
o
37. Bond angle between two hybrid orbitals is 180 . The “S” character in hybrid
orbital is:
(a) 25 % (b) 33.3 % (c) 50 % (d) 100 %
38. Which is not correct?
(a) Sigma bond is stronger than Pi bond
(b) Single bond is stronger than double bond
(c) Tripple bond has greater bond energy than double bond
(d) Polar bond is stronger than non-polar bond
39. In which one of the following pairs do the molecules have similar shapes?
(a) BF3 and A1Cl3 (b) CO2 and H2O
(c) CH4 and PH3 (d) NH3 and BCl3
40. Which one of the followings molecules is non-polar but contains polar bonds?
(a) HCl (b) H2O (c) SO3 (d) SO2
41. CO2 is iso-structure with:
(a) C2H4 (b) C2H2 (c) SnCl2 (d) NO2
42. Which one has lone pair with central atom?
(a) BF3 (b) CH4 (c) NH+4 (d) H2O
43. Number of sigma and Pi-bonds is chloroprene:
(a) 7, 2 (b) 9, 2 (c) 10, 2 (d) 11, 2
44. Which of the following help us to predict that reaction is spontaneous or non-
spontaneous?
(a) Enthalpy change (b) Internal energy change
(c) Free energy change (d) Change is work
45. Which of the following enthalpy change is always endothermic?
(a) ∆H0f (b) ∆H0soln (c) ∆H0at (d) ∆H0n
46. In endothermic reaction, the heat contents of:
(a) Product is more than that of reactant (b) Reactant is more than that of the product
(c) Both (a) and (b) (d) Reactants and products are equal
47. Which one of the following statement is incorrect?
(a) VSEPR theory explains the formation of covalent bonds
(b) Equivalent tetravalency of C-atom is explained by hybridization
(c) MOT explain paramagnetic behavior of oxygen
(d) According to L-Pauling metallic bond is just like a covalent bond
48. CsF is an ionic compound because:
(a) Cs has low I.P and F has high E.A (b) Cs has high I.P and F has low E.A
(c) Vs has high I.P and F has high E.A (d) Cs has low I.P and F has low E.A
49. Which of the following process is always exothermic?
(a) 1st I.P (b) 2nd I.P
st
(c) 1 E.A (d) 2nd E.A
50. Among the following the electron deficient compound is
(a) BC13 (b) PCl5
(c) CCl4 (d) CH4
51. Which of the following has sp hybridized carbon atom?
(a) CH3 — CH2 — CH3 (b) CH2 = CH2
(c) CH3 — CN (d) C6H6
52. Which contains both polar and non-polar bonds?
(a) NH4Cl (b) H2O2

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 (c) HCN (d) CH4
53. To determine the enthalpy of reaction indirectly which of the following is used
(a) Glass calorimeter (b) Hess’s law
(c) Bomb calorimeter (d) All of these
54. In the exothermic reaction the enthalpy of reaction is always
(a) Zero (b) Negative
(c) Positive (d) None of these
55. Which of the following molecules is not planar?
(a) Benzene (b) Ethane
(c) Boron trifluoride (d) Hydrogen bromide
56. Which molecule contains only six bonding electrons?
(a) XCl (b) C2F6
(d) H2O (d) NF3
57. The molecule having highest bond energy is
(a) N ≡ N (b) C ≡ C
(c) C ≡ N (d) C ≡ O
58. Both BF3 and NF3 are covalent but BF3 molecule is non-polar while NF3 is polar because
(a) Atomic size of boron is smaller than nitrogen
(b) BF3 is planar but NF3 is pyramidal
(c) Boron is a metal while nitrogen is gas
(d) BF bond has no dipole moment while NF bond has dipole
59. Which one of the following is the correct set with reference to molecular formula,
hybridization of the central atom and shape of the molecule?
(a) CO2, sp2, bent (b) BeC12, sp, linear
2
(c) H2O, sp , bent (d) H2O, sp3, linear
60. Select correct statement:
(a) When a covalent bond is framed, transfer of electrons takes place.
(b) Pure H2O does not contain any ion
(c) A bond is formed when attractive forces overcome repulsive forces
(d) HF is less polar than HBr

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