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| MOST IMPORTANT CHEMISTRY MCQ |
a) diazonium salt b) cupramonium salt c) ferrous salt d) ammonium salt
2. Enzymes having two sites are :
a) conjugate enzyme b) apoenzyme c) holoenzyme d) allosteric enzyme
3. A chiral compound is :
a) 2 , 3 , 4 -trimethyl hexane b) n - hexane c) methane d) n - butane
4. The kinetic energy of two moles of N2 at 27*C is ( R = 8.324 J/K/mol ) :
a) 5491.6 J b) 6491.6 J c) 7491.6 j d) 8882.4 J
5. The halide having highest melting point is :
a) NaF b) NaCl c) NaBr d) NaI
6. The molecule having highest bond energy is :
a) N-- N b) F -- F c) C-- C d) O -- O
7. Liquid ammonia and liquor ammonia are :
a) same b) different c) allotropes d) isotopes
8. The enthalpy of formation of ammonia is = 46.0 kJ/mol .The enthalpy change for following reaction
is :
2NH3 ------- > N2 + 3H2
a) 42.0 kJ b) 64.0 kJ c) 86.0 kJ d) 92.0 kJ
9. At 25*C the pH of a solution containing 0.10 M sodium acetate and 0.03 M acetatic acid is :
(pKa value of CH3COOH = 4.57 )
a) 3.24 b) 4.59 c)5.09 d) 6.67
10. The size of C-- C bond in benzene is :
a) 1.54 A* b) 1.39 A* c) 1.22 A* d) 1.21 A*
11. Hydrogen is produced by the reaction :
a) Na2O2 + 2HCl b) Mg + H2O c) BaO2 + HCl d) H2S4O8 + H2O
12. Which of the following is an iron ore ?
a) Cassiterite b) Magnetite c) Galena d) Copper pyrite
pyridine
13. C2H5OH + SOCl2 -----------> C2H5Cl + SO2 + HCl
The above reaction is known as :
a) Williamson's synthesis b) Hoffmann's reaction c) Mendius reaction d) Darzen's reaction
14. Methyl orange comes under :
a) mordant dye b) nitro dye c) acid dye d) basic dye
15. The tribasic acid is :
a) H3PO4 b) H3PO3 c) H3PO2 d) H4P2O7
16.Oxidation number of Fe in Fe2O3 is :
a) 1 / 2 b) 2 / 6 c) 8 / 3 d) 3 / 2
17. The monomer of teflon is :
a) tetra chloroethylene b) tetra bromoethylene c) tetra iodoethylene d) tetra fluoroethylene
18. Acetone can easily be converted into propane by the action of :
a) HI b)H3PO3 c) HNO3 d) HIO3
19. 1000g calcium carbonate solution contains 10g carbonate . The concentration of solution is :
a) 10 ppm b) 100 ppm c) 1000 ppm d) 10,000 ppm
20. Quantum numbers of an atom can be defined on the basis of :
a) Aufbau's principle b) Heisenberg's uncertainity principles c) Hund's rule
d) Pauli's exclusion principle
21. Propyne and propene can be distinguished by :
a) dil KMnO4 b) conc. H2SO4 c) AgNO3 in ammonia d)Br2 in CCl4
22. Schottky defect defines imperfection in the lattice structure of a :
a) gas b) plasma c) liquid d) solid
23. A compound posses 8 % sulphur by mass. The least molecular mass is :
a) 200 b) 400 c) 155 d) 355
sunlight
24. H2 + Cl2 -------------> 2HCl
In the above reaction the order of reaction is :
a) 3 b) 2 c) 0 d) 1
25. The mass of 70% H2SO4 required for neutralization of one mole of NaOH is :
a) 70 g b) 35 g c) 30 g d) 95 g
26. The most stable ion is :
a) CH3C⁺H2 b) (CH3)2C⁺H c) (CH3 )3C⁺ d) C6H5C⁺H2
27. The paramagnetic species is :
a) KO2 b) SiO2 c) TiO2 d) BaO2
28. The reagent commonly used to determine hardness of water titrimetrically is :
a) oxalic acid b) disodium salt of EDTA c) sodium citrate d) sodium thiosulphate
29. The true statement for the acids of phosphorus H3PO2 , H3PO3 and H3PO4 is :
a) the order of their acidity is H3PO4 > H3PO2 > H3PO3
b) all of them are reducing in nature c) all of them are tribasic acids
d) the geometry of phosphorus is tetrahedral in all the three
30. The colourless species is :
a) VCl3 b) VOSO4 c) Na3VO4 d) [V (H2O)6 ] SO4.H2O
31. Lanthanide for which +II and +III oxidation states are common is :
a) La b) Nd c) Ce d) Eu
32. The mixture of concentrated HCl and HNO3 made in 3 : 1 ratio contains :
a) ClO2 b) NOCl c) NCl3 d) N2O4
33. Intermolecular hydrogen bonding is strongest in :
a) methylamine b) phenol c) formaldehyde d) methanol
34. The ortho / para directing group among the following is :
a) COOH b) CN c) COCH3 d) NHCOCH3
35. The treatment of benzene with isobutane in the presence of sulphuric acid gives :
a) isobutyl benzene b) tert - butyl benzene c) n -butyl benzene d) no reaction
36. Nitrobenzene gives N- phenylhydroxyllamine by :
a) Sn / HCl b) H2 /Pd -C c) Zn / NaOH d) Zn / NH4Cl
37. Sub-unit present in haemoglobin are :
a) 2 b) 3 c) 4 d) 5
38. What is the coordination number of sodium in Na2O :
a) 6 b) 4 c) 8 d) 2
39. Which of the following compounds possesses the C -- H bond with the lowest bond dissociation
energy :
a) Toluene b) Benzene c) n -pentane d) 2 , 2 - dimetyl propane
40. Which of the statements given below concerning properties of solution , describes a colligative
property :
a) boiling point of pure water decreases by the addition of ethanol
b) vapour pressure of pure water decreases by addition of nitric acid
c) vapour pressure of pure benzene decreases by the addition of naphthalene
d) boiling point of pure benzene increases by the addition of toluene
41. In which of the following acid base titration pH is greater than 8 at equivalence point ?
a) Acetic acid versus ammonia b) Acetic acid versus sodium hydroxide
c) Hydrochloric acid versus ammonia d) Hydrochloric acid versus sodium hydroxide
42. Time required to deposit one milimole of Aluminium metal by the passage of 9065 A through aqueous solution of Aluminium ion is :
a) 30 s b) 10 s c) 30,000 s d) 10 ,000 s
43. On dissolving moderate amount of sodium metal in liquid NH3 at low temperature which one of the
following does not occur ?
a) Blue coloured solution is obtained b) Na+ ions are formed in the solution
c) Liquid NH3 becomes good conductor of electricity d) Liquid ammonia remains diamagnetic
44. Among the following the achiral amino acid is :
a) 2 -ethylalanine b) 2 -methylglycine c) 2 -hydroxymethyl serine d) tryptophan
45. The quantum number ' m ' of a free gaseous atom is associated with :
a) the effective volume of the orbital b) the shape of the orbital c) the spatial orientation of the
orbital d) the energy of the orbital in the absence of a magnetic field
BEST OF LUCK
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