Which of the following instruments is used in detecting the presence of radiation?
Απάντηση
(B)
Geiger-Muller counter
2
The molecule which has a linear shape is
Απάντηση
(D)
CO2
3
The formula of the compound formed between a trivalent metal, M and a divalent non-metal, Y is
Απάντηση
(A)
M2Y3
4
An atom of an element X gains two electrons. The symbol of the ion formed is
Απάντηση
(C)
X 2-
5
Which of the following statements is correct?
Απάντηση
(D)
Cations are smaller than the parent atom
6
Which of the following arrangements represents the correct order of electronic energy level?
Απάντηση
(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
Απάντηση
(D)
p-block, period 3, group 3
8
In the periodic table all elements within the same group have the same
Απάντηση
(B)
number of valence electrons
9
Which of the following halogens is liquid at room temperature?
Απάντηση
(C)
Bromine
10
Rare gases are stable because they
Απάντηση
(D)
have octet structures
11
In the periodic table, alkaline earth metals can be found in group
Απάντηση
(B)
ll
12
In which of the following series are the atoms arranged in order of increasing ionization energy?
Απάντηση
(C)
O, F, Ne
13
Which of the following bond types is responsible for the high boiling point of water?
Απάντηση
(D)
Hydrogen bond
14
In metallic solid, the forces of attraction is between the mobile valence electrons and the
Απάντηση
(D)
positively charged nuclei
15
The bonds in crystalline ammonium chloride are
Απάντηση
(C)
ionic, covalent and dative
16
Which of the following elements is diatomic?
Απάντηση
(B)
Oxygen
17
Noble gas molecules are held together by
Απάντηση
(A)
van der Waals forces
18
Which of the following statements about nuclear reaction is correct? The reaction
Απάντηση
(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
Απάντηση
(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)
Απάντηση
(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]
Απάντηση
(A)
28.0%
22
The gas law which describes the relationship between volume and temperature is
Απάντηση
(B)
Charles' law
23
Which of the following phenomenna lead to decrease in volume of a liquid in an open container?
Απάντηση
(C)
Evaporation
24
The pressure exerted by a gas is a function of the
Απάντηση
(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]
Απάντηση
(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?
Απάντηση
(C)
Temperature
27
When heat is absorbed during a chemical reaction, the reaction is said to be
Απάντηση
(B)
endothermic
28
The aqueous solution which has pH > 7 is
Απάντηση
(D)
Na2CO3(aq)
29
Which of the following acids would readily react with CaCO3 to liberate CO2?
Απάντηση
(B)
H2SO4
30
Which of the following compounds crystallizes without water of crystallization?
Απάντηση
(C)
NaCI
31
A substance is said to be impure if
Απάντηση
(A)
its melting point range is wide
32
The following factors affect the solubility of a solid in a given solvent except
Απάντηση
(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?
Απάντηση
(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
Απάντηση
(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?
Απάντηση
(C)
12(aq)
36
The separation of petroleum fractions depends on the differences in their
Απάντηση
(D)
boiling points
37
The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is
Απάντηση
(B)
sodium ethanoate
38
Which of the following organic compounds would decolourize bromie water?
Απάντηση
(A)
Benzene
39
How many isomers has C\(_3\)H\(_6\)CI\(_2\)?
Απάντηση
(C)
4
40
Which of the following reactions is common to all hydrocarbones?
Απάντηση
(A)
Combustion
41
A hydrocarbon compound contains 92.3% carbon Determine its empirical formula [H = 1.00; C = 12.0]
Απάντηση
(A)
CH
42
The main function of limestone in the blast furnace is to
Απάντηση
(C)
remove impurity
43
Which of the following raw materials is used in a plastic industry?
Απάντηση
(A)
Ethene
44
Which of the following statements about fine chemical is correct? It
Απάντηση
(C)
is produced in relatively small amount
45
Which of the following materials is classified as a non-biodegradable pollutant?
