MCQ
Subject : Inorganic Chemistry (Paper-II)
Class : T.Y.B.Sc.
1.The oxidation state of iron in met-hemoglobin is
a) Three b) Two c) Four d) Zero
2.The correct set of the biologically essential elements is,
a) Fe, Mo, Cu, Zn b) Fe, Cu, Co, Ru c) Cu, Mn, Zn, Ag d) Fe, Ru, Zn, Mg
3.The actual base pairs present in the double helical structure of DNA containing adenine (A), thymine (T),
cytosine (C) and guanine (G), are
a) AG and CT b) AC and GT c) AG and AC d) AT and GC
4.Based on the behaviour of the metalloenzymes, consider the following statements
(A) In the enzymes, the zinc activates O2 to form peroxide species.
(B) In the enzymes, the zinc activates H2O and provides a zinc bond hydroxide.
(C) In the oxidases, the iron activates O2 to break the bonding between the two oxygens
(D) Zinc ion acts as a nucleophile and attacks at the peptide carbonyl
The set of correct statements is,
a) A and B b) B and C c) C and D d) A and D
5.Identify correct statements for mercury as an environment pollutant.
1. Carbanionic biomethylation converts it to MeHg+
2. Thiol group of cysteine has strong affinity for mercury
3. Mercury containing industrial catalyst release caused Minamata disaster
The correct answer is
a) A and B b) A and C c) B and C d) A, B and C
6.Match the metalloproteins in column– A with their function in column– B
Column– A Column– B
I. Oxyhemocyanin A. hydrolysis of C-terminal peptide bond
II. Carbonic anhydrase B. methylation
III. Cytochrome P450 C. C. Conversion of CO2 to H2CO3
IV. Carboxy-peptidase A D. oxdiation of alkene
E. oxygen stroage
F. oxygen transport
The correct answer is
a) I – F; II – C; III – D; IV – A
b) I – E; II – C; III – A; IV – F
c) I – F; II – B; III – C; IV – A
d) I – E; II – D; III – C; IV – A
7.Toxicity of cadmium and mercury in the body is being reversed by proteins, mainly
using the amino acid residue,
a) Glycine b) Leucine c) Lysine d) Cysteine
8.If an enzyme fixes N2in plants by evolving H2, the number of electrons and protons
associated with that,respectively are
a) 6 and 6 b) 8 and 8 c) 6 and 8 d) 8 and 6
9.In photosynthetic systems the redox metalloproteins involved in electron transfer are
cytochrome (cyt, b),cytochrome bf complex (cyt bf) and plastocyamin (PC). The
pathway of electron flow is
a) PC– > cyt b – > cyt bf b) cyt bf – > cyt b – >PC
c) cyt b– > cyt bf – > PC d) PC– > cyt bf – > cyt b
10.Based on the behaviour of the metalloenzymes, consider the following statements
(A) In the enzymes, the zinc activates O2 to form peroxide species.
(B) In the enzymes, the zinc activates H2O and provides a zinc bond hydroxide.
(C) In the oxidases, the iron activates O2 to break the bonding between the two oxygens
(D) Zinc ion acts as a nucleophile and attacks at the peptide carbonyl
The set of correct statements is,
a) A and B b) B and C c) C and D d) A and D
11. Which oxidation states correctly represent the usual range exhibited by the stated metal?
a) Ce; +3 and +4 b) Th; +2 and +4 c) Pu; +3, +4, +5 and +6 d)U; +2, +3 and +4
12. Which isotope is produced by an (n, γ) reaction starting from 230Th?
a) 229Th b) 229Ac c) 231Th d) 231Pa
13. Which statement is incorrect about the lanthanoid metals?
a) Each metal reacts with dilute acid to release H2
b) Eu and Yb dissolve in liquid NH3 to give Eu3+ and Yb3+ respectively
c) Reactions between Ln and H2 give hydrides of formula LnH2 or LnH3
d) The chemistry of the lanthanoids is dominated by the +3 oxidation state
14. Which of the following series contains only paramagnetic metal ions?
a) La3+, Ce3+, Sm3+ b) Sm3+, Ho3+, Lu3+ c) Ce3+, Eu3+, Yb3+ d) La3+, Gd3+, Eu3+
15. In addition to uranium, which other actinoid occurs naturally in significant amounts?
a) Actinium b) Plutonium c) Protactinium d) Thorium
16. Which is the most common oxidation state for thorium in its compounds?
a) +3 b) +4 c) +5 d) +6
17. The most common oxidation state of lanthanides is
a) +4 b) +3 c) +6 d) +2
18. 14 elements after actinium is called
a) Lanthanides b) Actinides c) D-block elements d) P block elements
19. Which of the following is a correct property of lanthanides?
a) Non-reactive with oxygen b) Very low boiling point
c) Silver metal colour d) Odour comparable to a rotten egg smell
20. Which of the following is a correct term lanthanide elements can also be referred to as?
a) nonmetal b) rare-earth metals c) alkaline earth metal d) halogen
21. Which statement is incorrect about a cubic close-packed lattice?
a) All atoms have a coordination number of 12
b) The lattice contains both tetrahedral and octahedral holes
c) Layers of close-packed atoms are stacked in an ABABAB… pattern
d) The packing is more efficient than in a body-centred cubic lattice
22. In any cubic lattice, an atom lying at the corner of a unit cell is shared equally by how many unit
cells?
a) one b) two c) eight d) four
23. Which of the following solids is not an electrical conductor?
(A) Mg (s)(B) TiO (s)(C) I2 (s) (D) H2O (s)
a)(A) only b)(B) Only c)(C) and (D) d)(B), (C) and (D)
24. Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed
structure?
a)A tetrahedral void is formed when a sphere of the second layer is present above triangular void in the
first layer.
b)All the triangular voids are not covered by the spheres of the second layer.
c)Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular
voids in the first layer and the triangular shapes of these voids do not overlap.
d)Octahedral voids are formed when the triangular voids in the second layer exactly overlap with similar
voids in the first layer.
25.The value of magnetic moment is zero in the case of antiferromagnetic substances because the
domains ________.
a)get oriented in the direction of the applied magnetic field.
b)get oriented opposite to the direction of the applied magnetic field.
c)are oppositely oriented with respect to each other without the application of magnetic field.
d)cancel out each other’ s magnetic moment.
26.Which of the following statements are not true?
a)Vacancy defect results in a decrease in the density of the substance.
b)Interstitial defects results in an increase in the density of the substance.
c)Impurity defect has no effect on the density of the substance.
d)Frankel defect results in an increase in the density of the substance.
27.Which of the following statements are true about metals?
a)Valence band overlaps with conduction band.
b)The gap between valence band and conduction band is negligible.
c)The gap between valence band and condtion band cannot be determined.
d)Valence band may remain partially filled.
28.Which of the following defects is also known as dislocation defect?
a)Frenkel defect b)Schottky defect
c)Non-stoichiometric defect d)Simple interstitial defect
29. Silicon doped with electron-rich impurity forms ________.
a)p-type semiconductor b)n-type semiconductor c)intrinsic semiconductor d)insulator
30. The total number of tetrahedral voids in the face centred unit cell is __________.
a)6 b)8 c)10 c)12
31. To get a n-type semiconductor from silicon, it should be doped with a substance with
valence__________.
a)2 b)1 c)3 d )5
32. Which of the following is true about the charge acquired by p-type semiconductors?
a)positive b)neutral c)negative d)depends on concentration of p impurity
33. Graphite cannot be classified as __________.
a)conducting solid b)network solid c)covalent solid d)ionic solid
34. Which of the following is not the characteristic of ionic solids?
a)Very low value of electrical conductivity in the molten state. b)Brittle nature.
c)Very strong forces of interactions. d)Anisotropic nature.
35. Cations are present in the interstitial sites in __________.
a)Frenkel defect b)Schottky defect c)Vacancy defect d)Metal deficiency defect
36. The resistivity of a semiconductor ____________ conductors and insulators
a)More than that of b)Lies between that of c)Less than that of d)None of the above
37. The most commonly used semiconductor is _________
a)Germanium b)Carbon c)Sulfur d)Silicon
38. In a semiconductor, the energy gap between the valence band and conduction band is
about________
a) 5 eV b) 10 eV c) 15 eV d) 1 eV
39. A semiconductor has ____________ temperature coefficient of resistance.
a) Negative b) Positive c) Zero d) None of the above
40. A semiconductor generally has ____________ valence electrons
a) 2 b) 3 c) 4 d) 6
41. When a pure semiconductor is heated, it’ s resistance_______
a) Goes down b) Goes up c) Remains the same d) None of the above
42. A solid that offers no _________ passage of electricity is called super conductors.
a) Conductance b) Inductance c) Resistance d) Impedance
43. Super conductors are discovered in the year _______
a) 1900 b) 1991 c) 1911 d) 1905
44. The phenomena of super conductors was first discovered by ___________
a) Kammerlingh Onnes b) Neils Bohr c) Richard Smalley d) Otto Lehman
45. Ideal super conductors completely become __________ at super conducting state.
a) Diamagnetic b) Ferro magnetic c) Ferri magnetic d) Para magnetic
46. The ideal super conductors exhibit __________
a) Meissner effect b) Mesmeric effect c) Mesomeric effect d) Monomeric effect
47. Flow of electrons is affected by the following
a)Thermal vibrations b) Impurity atoms c) Crystal defects d) all
48. Units for electric field strength
a) A/cm2 b) mho/meter c) cm2/V.s d) V/cm
49. The metal which is liquid at room temperature is
a) Bromine b) Mercury c) Iodine d) Potassium
50. Which one of the following four metals would be displaced from the solution of its salts by other
three metals?