Chemistry MCQs 11

19:26:00 Unknown 0 Comments

MCQ's with answers chemistry for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.

1. Relationship between volume of gas and prevailing conditions of temperature and pressure called
   1. Gas laws
   2. Rate laws
   3. Equilibrium laws
   4. none
2. Liquids are less common than solids and gases because
   1. They exist in narrow range of temperature and pressure
   2. They have definite volume
   3. Liquid molecules can slide past each other
   4. Molecules contain three type of motion
3. Pressure remain constant, at which temperature the volume of gas becomes twice of what it is at 0 degree
   1. 546 degree centigrade
   2. 200 degree centigrade
   3. 546 K
   4. 273 K
4. The value of Vander Wall’s constant “A” for gases CO2,N2,O2 and SO2 are 3.59,1.39,1.36 and 6.17 atm dm6 mol-2 dm5 respectively. The gas which can be most easily liquefied is
   1. CO2
   2. N2
   3. O2
   4. SO2
5. Under which conditions, real gasses deviate from ideal behavior
   1. Low temperature and low pressure
   2. High temperature and high pressure
   3. Low temperature and high pressure
   4. High temperature and low pressure
6. Compressibility factor for and ideal gas is
   1. 1.5
   2. 2.0
   3. 1.0
   4. 0.5
7. Which of the following gases shows more ideal behavior at 0 degree
   1. H2
   2. He
   3. CH4
   4. NH3
8. Which of the following formula is correct for density of any gas
   1. d= RT/PM
   2. d= MT/PR
   3. d= PM/RT
   4. d= RM/PT
9. Critical temperature of gas depends upon
   1. Shape of molecule
   2. Inter molecular forces
   3. Size of molecules
   4. all
10. the rate of diffusion of hydrogen gas is three times than that of an unknown gas at same temperature and pressure, then the molar mass of unknown gas is
    1. 32
    2. 16
    3. 18
    4. 27
11. the highest temperature at which gas can be liquefied and above which liquefaction is impossible is called
    1. boiling temperature
    2. transition temperature
    3. upper consulate temperature
    4. critical temperature
12. Dipole dipole forces depends on
    1. Electronegativity difference of two bonded atom
    2. Distance between molecules
    3. Shape of the molecule
    4. Both a and b
13. Which is not an application of liquid crystals
    1. Used as temperature sensor
    2. In display of electrical devices
    3. Used for skin thermography
    4. Source of energy
14. Amorphous solids have
    1. Sharp melting point
    2. Undergo clean cleavage when cut with knife
    3. Have perfect arrangement of atoms
    4. Can possess small region of orderly arrangement
15. DNA has two spiral chains. They are linked through H-bonding which is dominant between
    1. C and H
    2. N and H
    3. O and H
    4. N and  O
16. Which pair of compounds are isomorphic in nature
    1. NaCl and KNO3
    2. KNO3 and CaCO
    3. MgO and NaF
    4. NaF and CaCO3
17. Which of the following substances shows anisotropic behavior in electrical conductivity
    1. Diamond
    2. Graphite
    3. Solid NaCl
    4. ice
18. The electrical conductivity of metals
    1. Decreases with decreasing temperature
    2. Increases with increasing temperature
    3. Decreases with increasing temperature
    4. All
19. The amount of energy released when gaseous ions of opposite charge combine together to form a crystalline solid
    1. Ionization energy
    2. Kinetic energy
    3. Lattice energy
    4. Atomization energy
20. Temperature at which molecular motion ceases is called
    1. Absolute zero
    2. Critical temperature
    3. Absolute temperature
    4. Difficult to predict
21. General gas equation is combination of
    1. Boyle’s law
    2. Charles’s law
    3. Avogadro’s law
    4. all
22. Pressure of 1 Nm-2 is equal to
    1. One bar
    2. One Pascal
    3. 1 psi
    4. One atm
23. In intense electrical field and at a very high temperature matter generally exist in
    1. Solid state
    2. Liquid state
    3. plasma state
    4. Gaseous state
24. Which of the following is exact relationship between F and C
    1. F =5/9[C-32]
    2. F= 9/5C+32
    3. C=5/9F+32
    4. all
25. The density of a gas is 1.964 g dm-3 at 273k and 76 cm Hg. The gas is
    1. CH4
    2. C2H4
    3. CO2
    4. Xe
26. The molecule of CO2 in dry ice forms the
    1. Ionic bond
    2. Molecular solids
    3. Covalent
    4. Any type of
27. A sample of 5.0 g of which substance ins held together by dipole dipole forces
    1. H2
    2. NH3
    3. HBr
    4. CaH2
28. All of the following are types  of liquid crystal except
    1. Nematic
    2. Smectic
    3. Cholestric
    4. mismertic
29. Which element exists as discrete small molecules in solid state
    1. Aluminum
    2. Iodine
    3. Silicon
    4. sodium
30. Which of the following statements is incorrect
    1. Structure of ice is hexagonal
    2. Ethanol is more soluble in water than chloroethane
    3. Propane has less boiling point than pentane
    4. all
31. Which of the following crystal system is the most unsymmetrical
    1. Monoclinic
    2. Triclinic
    3. Hexagonal
    4. Trigonal
32. The boiling point of higher alkanes are greater than those of lower alkanes due to reason that
    1. Higher alkanes have greater hydrogen bonding
    2. The polarizabilities of higher alkanes are greater
    3. Higher alkanes have zig-zag structure
    4. all
33. The boiling point of the halogens
    1. Increases down the group
    2. First increases then decreases down the group
    3. First decreases then increases down the group
    4. no particular trend
34. The distillation of liquid under reduced pressure is called
    1. Vacuum distillation
    2. Destructive distillation
    3. Fractional distillation
    4. distillation
35. The brittleness of the ionic compound is due to the reason that
    1. Ions are present in the crystal
    2. The size of the ions are unequal
    3. They are not good conductor of electricity
    4. The negative and positive ions are arranged in alternate positions in layer and these positions are disturbed by stress
36. The arrangement ABC,ABC,……… is referred as
    1. Cubic close packing
    2. Hexagonal close packing
    3. Octahedral close packing
    4. Tetrahedral close
37. Long chains of amino acids are coiled about one another into a spiral by
    1. Covalent bond
    2. Ionic bond
    3. Hydrogen bond
    4. Vander wall’s forces
38. Ethanol is much more soluble in water than ethylethanoate, which one of the following statement correctly account for this
    1. Ethanol is a polar molecule, but ethyl ethanoate is non polar
    2. Ethanol is non polar molecule but ethylethanoate is polar
    3. A hydrogen bond is formed between H atom of the OH group in ethanol an d O atom of water molecules
    4. all
39. A purbid liquid state which exists between melting temperature and clearing temperature is called
    1. Amorphous solid
    2. Crystalline solid
    3. Vitreous solid
    4. Liquid crystal
40. Existence of an element in more than one crystalline forms is called
    1. Polymorphism
    2. Isomerphism
    3. Allotropy
    4. isomerism
41. When liquid water changes to ice its volume increases. The increase in volume is
    1. 5%
    2. 9%
    3. 10%
    4. 18%
42. A real gas obeying Vander wall’s equation will resemble ideal gas if
    1. Both ‘a’ and ‘b’ are large
    2. Both ‘a’ and ‘b’ are small
    3. ‘a’ is large and ‘b’ is small
    4. ‘a’ is small and ‘b’ is large
43. Interaction between ion and polar solvent is called:
    1. Dipole Dipole interaction
    2. London forces
    3. Debye forces
    4. Ion dipole forces
44. If atmospheric pressure decreases then boiling point
    1. Decreases
    2. Increases
    3. Remain unchanged
    4. none
45. Graham’s law refers to
    1. Boiling point of gases
    2. Gas compression problems
    3. Gaseous diffusion
    4. Volume changes of gases due to change in temperature 

1.    A        2. A   3. C         4.D         5.C          6.C          7.B          8. C         9.D         10.C       11.D       12.D       13.D       14.D         15.C       16.C       17.B       18.C       19.C       20.A       21.D       22.B       23.C       24.B       25.C       26.B       27.C         28.D       29.B       30. D      31.B       32.B       33.A       34.A       35.B       36.A       37.C       38.D       39.D       40.C         41.B       42.B       43. D      44.A       45.C