 |
| IMPORTANT CHEMISTRY MCQ |
1. A bivalent metal the equivalent weight of 12 . The molecular weight of its oxide will be :
a) 36 b) 24 c) 40 d) 32
2. If 0.189 g of a chlorine containing organic compound gave 0.287 g of silver chloride , then the
percentage of chlorine in the organic compound is :
a) 35.47 b) 35.57 c) 37.57 d) 45.37
3. One gram mole of a gas at NTP occupies 22.4 litres . This fact was derived from :
a) law of gaseous volume b) Dalton's atomic theory c) Avogadro's hypothesis
d) Law of constant proportions
4. The specific heat of a metal is 0.16 . Its approximate atomic weight would be :
a) 40 b) 16 c) 32 d) 64
5. The maximum number of electrons , present in an orbit that is represented by azimuthal quantum
number ( l ) = 3 , will be :
a) 8 b) 2 c) 14 d) 6
6. Particle nature of the electron was experimentally demonstrated by :
a) de Broglie b) Schrodinger c) Max Born d) J.J. Thomson
7. A radioactive nuclide decays at such a rate that after 96 min ,only 1 /8th of the original amount remains
The value of half - life of the nuclide is :
a) 32 min b) 12 min c) 48 min d) 24 min
8. For principle quantum number n = 4 , the total number of orbitals having l = 3 is :
a) 3 b) 7 c) 5 d) 9
9. Largest difference in radii is found in case of the pair :
a) Li , Na b) Na , K c) K , Rb d) RB , Cs
10. Difference in atomic radius is maximum for :
a) Rb - Cs b) K -Rb c) Na - K d) Li - Na
11. The BCl3 is a plannar molecule wher as NCl3 is pyramidal , because :
a) B-Cl bond is more polar than N - Cl b) N-Cl bond is more covalent than B-Cl
c) nitrogen atom is smaller than boron atoms d) BCl3 has no lone pair but NCl3 has a lone pair of
electrons
12. CaO and NaCl have the same crystal structure and approximately the same ionic radii . If U is the
lattice energy of NaCl , the approximately lattice energy of CaO is :
a) U / 2 b) U c) 2 U d) 4U
13. Which among the following has the largest dipole moment ?
a) HI b) H2O c) NH3 d) SO3
14. Maximum covalency of an element of atomic number 7 is :
a) 4 b) 2 c) 5 d) 3
15. A mixture of 40 g of oxygen and 40 g of helium has a total pressure of 0.9 atm . The partial pressure
of oxygen is :
a) 0.5 atm b) 0.1 atm c) 0.9 atm d) 0.2 atm
16. At what pressure will a quantity of gas which occupies 100ml at a pressure of 720 mm , occupy a
volume of 84 ml :
a) 820.20 mm b) 784.15 mm c) 736.18 mm d) 857.14 mm
17. Two different gases enclosed in different flasks A and B at same temperature and pressure were
found to contain same number of molecules. The ratio of volumes of the flasks A and B must be :
a) 1 : 3 b) 1 : 1 c) 1 : 4 d) 1 : 2
18. Helium atom is two times heavier than a hydrogen molecule . At 298 K , the average kinetic energy
of helium atom is :
a) two times that of a hydrogen molecule b) same as that of a hydrogen molecule
c) four times that of a hydrogen molecule d) half that of a hydrogen molecule
19. Dominance of strong repulsive forces among the molecules of the gas ( Z = compressibility factor )
a) depends on Z and indicated by Z > 1 b) depends on Z and indicated by Z > 1
c) depends on Z and indicated by Z < 1 d) is independent of Z
20. The property which can be classified as an intensive property , is :
a) volume b) mass c) heat capacity d) temperature
a) state of reactants and products b) nature of reactants and products
c) different intermediate reaction d) initial and final enthalpy change of a reaction
22. Internal energy does not include :
a) rotational energy b) vibrational energy c) nuclear energy d) energy gravitational pull
23. For a spontaneous process the correct statement is :
a) entropy of the system always increases b) free energy of the system always increases
c) total energy change is always negative d) total entropy change is always positive
24. Which thermodynamic parameter is not a state function ?
a) q at constant pressure b) q at constant volume c) W at adiabatic d) W at isothermal
25. Which of the following indicator is known as metal indicator ?
a) Phenolphtahlein b) Phenol red c) Eriochrome -Black -T d) Methyl orange
26. Ostwald's dilution law is applicable only to :
a) strong electrolytes b) solute c) weak electrolytes d) solvent
27. The pH of 0.001 (N) acetic acid solution, which is 10% dissociated , is :
a) 3 b) 1 c) 4 d) 2
28. A buffer solution contains 0.1 M of acetic acid and 0.1 M of sodium acetate . What will be its pH ?
(pKa of acetic acid is 4.75 )
a) 5.00 b) 4.00 c) 5.25 d) 4.75
29. The pH value of decinormal solution of NH4OH which is 20% ionised is :
a) 12.95 b) 12.30 c) 14.70 d) 13.30
30. The pH of solution containing 0.10 M sodium acetate and 0.03 M acetic acid is
(pKa for CH3COOH = 4.57 )
a) 4.09 b) 6.09 c) 5.09 d) 7.09
31. The compound insoluble in water is :
a) mercurous nitrate b) mercuric nitrate c) mercurous chloride d) mercurous perchloride
32. Oxidation state of Fe in Fe2O3 is :
a) 3 / 2 b) 5 / 4 c) 4 / 5 d) 8 / 3
33. For decolourization of 1 mole of KMnO4 , the moles of H2O2 required is :
a) 1 / 2 b) 3 /2 c) 5 /2 d) 7 / 2
34. Oxidation state of iron in haemoglobin is :
a) 0 b) + 2 c) - 2 d) + 3
35. The volume of 3.0 N-H2O strength is :
a) 16.8 litres b) 4.2 litres c) 33.6 litres d) 8.4 litres
36. 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
37. Which of the following will not undergo hydrolysis in water ?
a) Ammonium sulphate b) Sodium sulphate c) Calcium sulphate d) All the salt will hydrolyse
38. Baking Soda or baking powder is :
a) washing soda b) caustic soda c) soda ash d) sodium bicarbonate
39. Which of the following is soluble in water ?
a) Be b) Sr c) Mg d) Ba
40. Which of the following acids will not evolve H2 gas on reaction with alkali metals ?
a) Hydrzoic acid b) Perxenic acid c) Boric acid d) None of these
41. Which of the following glasses is the most heat resistant ?
a) Bottle glass b) Flint glass c) Water glass d) Pyrex glass
42. Hydrolysis of beryllium carbide produces :
a) acetylene b) methane c) ethene d) none of these
43. Potash alum is used as :
a) catalyst b) disinfectant c) mordant d) coolant
44. The purification of alumina is called :
a) Baeyer's process b) Bosch process c) Castner process d) Hoop's process
45. The isomers which can be converted into another form by rotation of the molecules around single
bond , are :
a) conformers b) enantiomers c) diastereomers d) geometrical isomers
BEST OF LUCK
No comments:
Post a Comment