Which of the following instruments is used in detecting the presence of radiation?
پاسخ دهید
(B)
Geiger-Muller counter
2
The molecule which has a linear shape is
پاسخ دهید
(D)
CO2
3
The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is
پاسخ دهید
(A)
M2Y3
4
An atom of an element X gains two electrons. The symbol of the ion formed is
پاسخ دهید
(C)
X 2-
5
Which of the following statements is correct?
پاسخ دهید
(D)
Cations are smaller than the parent atom
6
Which of the following arrangements represents the correct order of electronic energy level?
پاسخ دهید
(C)
1s 2s 2p 3s 3p 4s 3d
7
The element with electron configuration 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\) belongs to
پاسخ دهید
(D)
p-block, period 3, group 3
8
In the periodic table all elements within the same group have the same
پاسخ دهید
(B)
number of valence electrons
9
Which of the following halogens is liquid at room temperature?
پاسخ دهید
(C)
Bromine
10
Rare gases are stable because they
پاسخ دهید
(D)
have octet structures
11
In the periodic table, alkaline earth metals can be found in group
پاسخ دهید
(B)
ll
12
In which of the following series are the atoms arranged in order of increasing ionization energy?
پاسخ دهید
(C)
O, F, Ne
13
Which of the following bond types is responsible for the high boiling point of water?
پاسخ دهید
(D)
Hydrogen bond
14
In metallic solid, the forces of attraction is between the mobile valence electrons and the
پاسخ دهید
(D)
positively charged nuclei
15
The bonds in crystalline ammonium chloride are
پاسخ دهید
(C)
ionic, covalent and dative
16
Which of the following elements is diatomic?
پاسخ دهید
(B)
Oxygen
17
Noble gas molecules are held together by
پاسخ دهید
(A)
van der Waals forces
18
Which of the following statements about nuclear reaction is correct? The reaction
پاسخ دهید
(B)
takes place inside the nucleus
19
Consider the reaction represented by the following equation: C\(_2\)H\(_2\) + yH\(_2\) → C\(_2\)H\(_6\). The value of y in the reaction is
پاسخ دهید
(C)
2
20
The volume of 0.25 moldm-3 solution of KOH that would yield 6.5g of of solid KOH on evaporation is (K = 39.0; o = 16.0; H = 1.00)
پاسخ دهید
(A)
464.30 cm3
21
The percentage by mass of calcium in Ca(OCI)2 is [Ca = 40.0; CI = 35.5; O = 16.0]
پاسخ دهید
(A)
28.0%
22
The gas law which describes the relationship between volume and temperature is
پاسخ دهید
(B)
Charles' law
23
Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
پاسخ دهید
(C)
Evaporation
24
The pressure exerted by a gas is a function of the
پاسخ دهید
(D)
frequency of collision between gaseous molecules
25
Which of the following gases are arranged in increasing order of diffusion rate? [H = 1 .0; C = 12; N = 14; O = 16; S = 32]
پاسخ دهید
(A)
SO 2 O2, NH3 H2
26
Which of the following variables is a measure of the average kinetic energy of the molecule of a gas?
پاسخ دهید
(C)
Temperature
27
When heat is absorbed during a chemical reaction, the reaction is said to be
پاسخ دهید
(B)
endothermic
28
The aqueous solution which has pH > 7 is
پاسخ دهید
(D)
Na2CO3(aq)
29
Which of the following acids would readily react with CaCO3 to liberate CO2?
پاسخ دهید
(B)
H2SO4
30
Which of the following compounds crystallizes without water of crystallization?
پاسخ دهید
(C)
NaCI
31
A substance is said to be impure if
پاسخ دهید
(A)
its melting point range is wide
32
The following factors affect the solubility of a solid in a given solvent except
پاسخ دهید
(C)
pressure
33
Consider the reaction represented by the equation: N\(_2\)O\(_4\)(g) ⇌ 2NO\(_2\)(g) ; ∆H = + x kJmol-1
What happens when the temperature is reduced at equilibrium?
پاسخ دهید
(B)
Concentration of N 2O4(g) increases.
34
Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell
پاسخ دهید
(B)
l, ll, and III only
35
Consider the redox reaction as represented by the following equation: 12(aq) + 2S2O32-(aq) → 21-(aq) + S4O62-(aq). Which of the species in the equation is reduced?
پاسخ دهید
(C)
12(aq)
36
The separation of petroleum fractions depends on the differences in their
پاسخ دهید
(D)
boiling points
37
The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is
پاسخ دهید
(B)
sodium ethanoate
38
Which of the following organic compounds would decolourize bromie water?
پاسخ دهید
(A)
Benzene
39
How many isomers has C\(_3\)H\(_6\)CI\(_2\)?
پاسخ دهید
(C)
4
40
Which of the following reactions is common to all hydrocarbones?
پاسخ دهید
(A)
Combustion
41
A hydrocarbon compound contains 92.3% carbon Determine its empirical formula [H = 1.00; C = 12.0]
پاسخ دهید
(A)
CH
42
The main function of limestone in the blast furnace is to
پاسخ دهید
(C)
remove impurity
43
Which of the following raw materials is used in a plastic industry?
پاسخ دهید
(A)
Ethene
44
Which of the following statements about fine chemical is correct? It
پاسخ دهید
(C)
is produced in relatively small amount
45
Which of the following materials is classified as a non-biodegradable pollutant?
