The number of orbitals in a p-sub level of an atom is
پاسخ دهید
(B)
3
2
Which of the following electron configurations represents that of an atom in its ground state?
پاسخ دهید
(D)
1s22s22p63s0
3
Which of the following ions has an electron configuration different from the other?
پاسخ دهید
(A)
17CI-
4
The atomic radii of metals are usually
پاسخ دهید
(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
پاسخ دهید
(B)
number of valence electrons
6
The d-block elements are paramagnetic because they
پاسخ دهید
(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
پاسخ دهید
(C)
l and lll only
8
Which of the following elements is a metalloid?
پاسخ دهید
(C)
Silicon
9
Which of the following halogens is liquid at room temperature?
پاسخ دهید
(D)
Bromine
10
The shape of a graphite crystal is
پاسخ دهید
(C)
hexagonal
11
The complex compound formed by the combination of two elements with a large electronegativity difference is likely to be
پاسخ دهید
(D)
ionic
12
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
پاسخ دهید
(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
پاسخ دهید
(C)
l and lll only
14
MgO does not readily dissolve in water because
پاسخ دهید
(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]
پاسخ دهید
(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\(^{23}\)]
پاسخ دهید
(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
پاسخ دهید
(A)
2,3 and 4
18
The formula of mercury (l) dioxonitrate (III) is
پاسخ دهید
(C)
Hg2(NO2)2
19
A sample of a gas may be identified as chlorine if it turns
پاسخ دهید
(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
پاسخ دهید
(C)
multiple proportion
21
Which of the following metals would readily displace hydrogen from steam?
پاسخ دهید
(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]
پاسخ دهید
(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
پاسخ دهید
(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
پاسخ دهید
(B)
strong hydrogen bonds holding its molecules together
25
The postulate that molecules are in constant random motion best explains why liquids
پاسخ دهید
(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]
پاسخ دهید
(A)
CI2
27
The energy evolved when magnesium burns in air is in the form of
پاسخ دهید
(C)
light and heat
28
A substance L reacts with NH\(_4\)NO\(_{3(aq)}\) to generate ammonia gas. L is likely to be
پاسخ دهید
(B)
NaOH
29
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except
پاسخ دهید
(A)
ammonium trioxocarbonate (IV)
30
Which of the following pH values indicates that a solution is a strong base?
پاسخ دهید
(D)
13
31
The hydrolysis of NH\(_4\)CI gives
پاسخ دهید
(A)
an acidic solution
32
A spot of oil paint on a shirt can best be removed using?
پاسخ دهید
(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?
پاسخ دهید
(D)
Pressure of reaction system
34
Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator
پاسخ دهید
(C)
l and ll only
35
The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is
پاسخ دهید
(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
پاسخ دهید
(A)
cracking
37
Which of the following substances would not produce ethanol when fermented?
پاسخ دهید
(D)
Vinegar
38
An alkanol can be prepared by the reaction of an alkene with
پاسخ دهید
(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?
پاسخ دهید
(C)
(CH3)3COH
40
Which of the following industrial processes depends on the action of enzymes?
