11th class (FSc) chemistry Unit 4 MCQs
26. The distillation of a liquid under reduced pressure is called:
a. Fractional distillation
b. Destructive distillation
c. Simple distillation
d. Vacuum distillation
27. Heat change for one mole of a solid during converting it into liquid iscalled:
a. Molar heat of sublimation
b. Molar heat of fusion
c. Enthalpy change
d. Molar heat of vapouization
28. Cholesteryl benzoate turns into milky liquid at:
a. 146oC
b. 144oC
c. 147oC
d. 145oC
29. Which is a pseudo solid?
a. NaCl
b. CaF2
c. All
d. Glass
30. Which substance show anisotropic behavior in electrical conductivity?
a. KI
b. Diamond
c. Ice
d. Graphite
31. In Al2O3 the ratio between the ice is:
a. 2:3
b. 1:2
c. 3:2
d. 2:1
32. Which one is the note an isomorphs palr?
a. K2SO4,K2Cr2O7
b. NaNO3, CaCO3
c. Zn,Cd
d. NaF,MgO
33. K2SO4 and K2CrO4 are isomorphs solids and exist in:
a. Trigonal form
b. Cubic form
c. Tetragonal
d. Orthorhombic
34. Which impurity makes the shape of sodium chloride crystal needle like:
a. Glucose
b. MgSO4
c. MgCO3
d. Urea
35. Allotropy is the property of:
a. Atom
b. Compound
c. Mixture
d. Element
36. How many allotropic form are present in carbon?
a. Four
b. Two
c. Five
d. Three
37. Existence of an element in more than one crytalline forms is called:
a. Isotropy
b. Isomorphism
c. Allotropy
d. Polymorphism
38. Transition temperature of sulphur S8 is:
a. 97.86oC
b. 95.5oC
c. 100oC
d. 98.6oC
39. The transition temperature of KNO3 is:
a. 128oC
b. 13.2oC
c. 32.02oC
d. 95.6oC
40. The transition temperature of Tin is:
a. 50oC
b. 15.6oC
c. 23.2oC
d. 13.2oC
41. When 10% urea is present in NaCl solution then which crystal becomes:
a. Needle like
b. Rod like
c. Egg like
d. Sphere like
42. In orthorhombic, then unit cell dimensions is are:
a. a ≠ b ≠ c α = β ≠ γ = 90o
b. a = b ≠ c α = β = γ = 90o
c. a ≠ b ≠ c α = β = γ
d. a ≠ b ≠ c α = β = γ = 90o
43. Structure of CrO42– is:
a. Cubic
b. Tetrahedral
c. Triclinic
d. Octahedral
44. Geometry of diamond is:
a. Rhombohedral
b. Tetragonal
c. Cubic
d. None of these
45. LiF is a crystalline substance and has:
a. Covalent crystals
b. Ionic crystals
c. Molecular crystals
d. Metallic crystals
46. Ionic solids are characterzied by:
a. High vapour pressure
b. Low melting points
c. Solubility in polar solvents
d. Good conductivity in solid state
47. Coordination number of Na+ ion NaCl is:
a. Four
b. One
c. Six
d. Two
48. The structure of sodium chloride is:
a. Simple cube
b. Body centered cube
c. Face centered cube
d. None of these
49. The crystals of diamond is:
a. Molecular
b. Ionic
c. Metallic
d. Covlant
50. The molecules of CO2 in dry ice form the:
a. Molecular crystals
b. Ionic crystals
c. Any type of crystals
d. Covalent crystals