12th class (Fsc) Chemistry unit 1 MCQs
26. The elements which gain electrons and form negative ions are considered as:
a. Metalloids
b. Metals
c. Inert gases
d. Non-metals
27. A characteristic property of non-metals in that they form:
a. Amphoteric oxides
b. Basic oxides
c. Neutral oxides
d. Acidic oxides
28. The most non-metallic element of the periodic table is:
a. Br
b. F
c. I
d. CI
29. The melting point of group IA elements are:
a. Intermediate
b. High
c. Very high
d. Low
30. In general the molecules, which exist as gaint covalent structures have:
a. Neither high nor low
b. Very high m.p
c. High m.p
d. Low m.p
31. The charge on an atom in a compound is called:
a. Valency
b. Oxidation state
c. Oxidation number
d. Both b & c
32. The amount of heat evolved or obsorbed, when 1 mole of:
a. Hydrolysis
b. Hydrogenation energy
c. Dehydration energy
d. Hydration energy
33. For a given set of ions. charge to size ratio recreases from top to bottom in a group, the hydration energy:
a. Remains the same
b. Also decreases
c. Increases than decreases
d. Increase
34. The oxidation state of a typical element in directly or indirectly related to its:
a. Position in the group
b. Group number
c. None of these
d. Period number
35. The ability of metal to conduct electricity is termed as:
a. Electro negativity
b. Electrical conductance
c. Ionization energy
d. Electron affinity
36. The elements of group IB are called:
a. Coinage metals
b. Transition metals
c. Inert gases
d. Non-metals
37. whicg of the following is not a coinage metal?
a. Pd
b. Au
c. Cu
d. Ag
38. Which on of the following pairs of elements is chemically most similar?
a. S & F
b. Na & Al
c. Se & Zn
d. Cu & Au
39. Chemically all the elements, which have tendency to form positive ions by loosing electrons are considered as:
a. Metalloids
b. Metals
c. Inert gases
d. Non-metals
40. A characteristic property of metals is that they form:
a. Amphoteric oxides
b. Basic oxides
c. Neutral oxides
d. Acidic oxides
41. The halides and hydrides of which group are considered purely ionic compound:
a. I-B
b. I-A
c. II-B
d. II-A
42. Which ionic halides has highest m.p and b.p?
a. Fluoride
b. Bromide
c. Iodide
d. Chloride
43. Which covalent halide has lowest m.p and b.p?
a. Bromide
b. Fluoride
c. Chloride
d. All of these
44. M.P of AlF3 is:
a. 178oC
b. 1260oC
c. 168oC
d. 1270oC
45. M.P of Al3 is:
a. 178oC
b. 188oC
c. 168oC
d. 198oC
46. The halides of ionic compounds are:
a. Polymeric
b. Covalent
c. Amphoteric
d. Ionic
47. The decreasing order of melting points in ionic halides:
a. I>Br>CI>F
b. F>Cl>Br>l
c. CI>I>F>Br
d. Cl>F>I>Br
48. Halides having highest lattice energies are:
a. Chlorides
b. Iodides
c. Fluorides
d. Bromides
49. which can form polymeric halide?
a. Ba
b. Be
c. Na
d. All
50. Halogen atoms in which halides act a bridge between two atoms of:
a. Ionic halides
b. Covalent halides
c. Polymeric halides
d. All