Chemistry Chapter 5 Entry Test MCQs
26. Crystals of ionic compounds are made of:
a. Ions
b. Atoms
c. Molecules
d. None of the above
27. Ionic compounds, in general, possess
a. Directional nature of bonds and low boiling points
b. High melting points, boiling points and non-directional bonds
c. High solubilities in both polar and non-polar solvents
d. High melting points and low-boiling points
28. Solid oxygen is an example of
a. molecular solid
b. ionic solid
c. polymeric solid
d. covalent solid
29. Sulphur is an example of?
a. Metallic solids
b. Ionic solids
c. Covalent network solids
d. Molecular solids
30. All of these are elements of symmetry except?
a. Centre of symmetry
b. Axis of symmetry
c. Diagonal of symmetry
d. Plane of symmetry
31. An example of three dimensional giant structure is
a. Sodium chloride
b. Ice
c. Iodine
d. Diamond
32. A wrong statement is
a. Copper is malleable and ductile
b. KCl is harder than Na – metal
c. The crystal of NaCl is brittle
d. Carborundum (SiC) is a soft solid
33. The arrangement of particles as a points in a crystal is called
a. Unit cell
b. Crystal lattice
c. Space lattice
d. Both B and C
34. A crystal has __ parameters to measure its dimension
a. Six
b. Three
c. Eight
d. Four
35. Which type of intermolecular forces are present in molecular solids?
a. Dipole-dipole Forces
b. Vander Waal’s force
c. Both A and B
d. None of these
36. Which one of the following may not be related to ionic compounds?
a. Polymorphism
b. Transition temperature
c. Isomerism
d. Isomorphison
37. Ionic solids do not conduct the electrical current because
a. The coordination number of ion is very high
b. Ions don’t have translatory motion
c. Strong covalent bonds are present in their structure
d. Free electrons are less
38. Ionic solids are mostly of high density due to
a. Close packing of ions
b. Chemical bonding
c. Structure
d. None of these
39. Diamond, Silicon carbide are insoluble in most of the solvents because
a. They have very big size
b. They have very high lattice energy
c. They do not interact with the solvent
d. All of these
40. Copper metal can be drawn into wires because
a. Copper has variable valency
b. Copper atoms are held together by true covalent bonds
c. Copper atoms are held together by non-directional metallic bond
d. Copper has unique electronic configuration
41. Which property of an ester can be used to check its purity before use as a food flavouring
a. Colour
b. Boiling point
c. Solubility in water
d. Odour
42. Which of the following inter molecular forces may be present in molecular solids?
a. H- bonding
b. Dipole – dipole forces
c. Van der Waal’s forces
d. All of the these
Lattice Energy + Radius Ratio + Packing
43. Hexagonal close packing is found in crystal lattice of
a. Al
b. Na
c. Be
d. Mg
44. The vacant space in the hcp unit cell is
a. 26%
b. 32%
c. 68%
d. 23%
45. The solubility of sodium chloride in water is possible because:
a. Ions of sodium chloride are tightly bond in their lattices
b. Hydration energy is greater than Lattice energy
c. Hydration energy of water is less than lattice energy
d. Lattice energy of sodium chloride is greater than hydrations energy
46. Lattice energy decreases with the increase in size of either the cation or anion as
a. Charge increases
b. Because molar mass increases
c. Packing becomes less tight
d. Bond angle changes
47. Metallic character of an element reflects its tendency to
a. Share electrons
b. Gain electrons
c. Donate electrons
d. Loose electrons
48. What will be the result of loose packing of ions in an ionic compound?
a. no axis of symmetry
b. high melting point
c. low lattice energy
d. high boiling point
49. Which one of the following lattice structure has lowest melting point?
a. Metallic lattice
b. Simple molecular lattice
c. Hydrogen bonded lattice
d. Giant molecular lattice
50. Crystalline structure of diamond is
a. Hexagonal close packing
b. Body centered cubic
c. Cubic close packing
d. Face centered cubic
51. In structure of NaCl, the number of formula units per unit cell is
a. 5
b. 3
c. 6
d. 4
52. The number of Na+ ions which surround each Cl– ion in the NaCl crystal lattice is
a. 6
b. 2
c. 4
d. 8
53. Ionic compounds that have the same structure also possess same
a. Formula mass
b. Atomic mass
c. Atomic ratio
d. Radius ratio
54. NaCl and CsF have same geometry because
a. Their cations belong to 1A group
b. Their anions belong to VIIA group
c. Both are soluble in water
d. They have similar radii ratio
55. Which one is true about lattice energy?
a. All ionic compounds have same lattice energy
b. It increases with increasing the size of cation
c. Lattice energy of NaCl is greater than that of LiCl
d. It decreases with increase the size of anion