The number of orbitals in a p-sub level of an atom is
Хариулт
(B)
3
2
Which of the following electron configurations represents that of an atom in its ground state?
Хариулт
(D)
1s22s22p63s0
3
Which of the following ions has an electron configuration different from the other?
Хариулт
(A)
17CI-
4
The atomic radii of metals are usually
Хариулт
(A)
greater than their ionic radii
5
Two elements, X and Y are in the same group on the periodic table because they both have the same
Хариулт
(B)
number of valence electrons
6
The d-block elements are paramagnetic because they
Хариулт
(B)
contain unpaired electrons in the partially filled 3d-orbital
7
Which of the following statements about a radioactive substance is/are correct? l. lt emits radiation continuously and spontaneously. ll. The emitted radiations are affected by temperature and pressure III. The radiation can penetrate opaque matter
Хариулт
(C)
l and lll only
8
Which of the following elements is a metalloid?
Хариулт
(C)
Silicon
9
Which of the following halogens is liquid at room temperature?
Хариулт
(D)
Bromine
10
The shape of a graphite crystal is
Хариулт
(C)
hexagonal
11
The complex compound formed by the combination of two elements with a large electronegativity difference is likely to be
Хариулт
(D)
ionic
12
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
Хариулт
(B)
NaAl(OH)4
13
The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together
Хариулт
(C)
l and lll only
14
MgO does not readily dissolve in water because
Хариулт
(D)
its lattice energy is higher than its hydration energy
15
Consider the following reaction equation: CaCO\(_{3(s)}\) + 2HCI\(_{(aq)}\) → CaCl\(_{2(aq)}\) + H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\). What mass of CaCI\(_2\) would be obtained when 25.0g of CaCO\(_{3(s)}\) is reacted with excess HCI\(_{(aq)}\)? [CaCO\(_3 = 100; CaCI\(_2\) = 111]
Хариулт
(D)
27.8 g
16
The number of sulphur atoms in 3.20g of SO\(_{2(g)}\) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 x 10\(^{23}\)]
Хариулт
(A)
3.01 x 1022
17
Consider the reaction represented by the following equation: xCH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + zH\(_2\)O. The values of x,y and z respectively, are
Хариулт
(A)
2,3 and 4
18
The formula of mercury (l) dioxonitrate (III) is
Хариулт
(C)
Hg2(NO2)2
19
A sample of a gas may be identified as chlorine if it turns
Хариулт
(D)
starch iodide paper blue-black
20
A metal M forms two types of chlorine, MCl\(_2\) and MCl\(_3\) which of the following laws best explains the relationship between the chlorides? Law of
Хариулт
(C)
multiple proportion
21
Which of the following metals would readily displace hydrogen from steam?
Хариулт
(C)
Magnesium
22
The volume occupied by 0.4 g of hydrogen gas at s.t.p. is [H = 1. 00; Molar volume at s.t.p. = 22.4 dm3]
Хариулт
(B)
4.48dm3
23
When a substance changes directly from the solid state to the gaseous state without forming a liquid, the substance is said to
Хариулт
(C)
sublime
24
At ordinary temperature H\(_2\)O is a liquid while H\(_2\)S is a gas. This is because H\(_2\)O has
Хариулт
(B)
strong hydrogen bonds holding its molecules together
25
The postulate that molecules are in constant random motion best explains why liquids
Хариулт
(A)
can undergo solidification
26
Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]
Хариулт
(A)
CI2
27
The energy evolved when magnesium burns in air is in the form of
Хариулт
(C)
light and heat
28
A substance L reacts with NH\(_4\)NO\(_{3(aq)}\) to generate ammonia gas. L is likely to be
Хариулт
(B)
NaOH
29
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except
Хариулт
(A)
ammonium trioxocarbonate (IV)
30
Which of the following pH values indicates that a solution is a strong base?
Хариулт
(D)
13
31
The hydrolysis of NH\(_4\)CI gives
Хариулт
(A)
an acidic solution
32
A spot of oil paint on a shirt can best be removed using?
Хариулт
(C)
kerosine
33
Consider the reaction represented by the following equation: CuO\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) → CuSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\). Which of the following factors will not affect the rate of the reaction?
Хариулт
(D)
Pressure of reaction system
34
Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator
Хариулт
(C)
l and ll only
35
The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is
Хариулт
(A)
+3
36
Consider the following reaction equation: C\(_{16}\)H\(_{34}\) → C\(_5\)H\(_{12}\) + C\(_{11}\)H\(_{22}\). The process represented by the equation is
Хариулт
(A)
cracking
37
Which of the following substances would not produce ethanol when fermented?
Хариулт
(D)
Vinegar
38
An alkanol can be prepared by the reaction of an alkene with
Хариулт
(A)
concentrated tetraoxosulphate (VI) acid
39
A tertiary alkanol has a molecular formula C\(_4\)H\(_{10}\)O. What is the structural formula of the compound?
Хариулт
(C)
(CH3)3COH
40
Which of the following industrial processes depends on the action of enzymes?
