Which of the following species determines the chemical properties of an atom?
პასუხი
(A)
Electron
2
The following glasswares are used to measure the volume of liquids EXCEPT
პასუხი
(C)
test tube
3
Pauli exclusion principle is related to
პასუხი
(D)
quantum numbers of electrons
4
The species with no electron in the 3d-orbital is
პასუხი
(B)
\(Sc^{3+}\)
5
The seperation of Nitrogen from oxygen using fractional distillation of air is possible because
პასუხი
(C)
of the difference in their boiling points
6
The purity of a solid sample can best be determined by its
პასუხი
(B)
melting point
7
The mass of one mole of \((NH_{4})_{2}CO_{3}\) is [O=16.0, N=14.0, C=12.0, H=1.0]
პასუხი
(D)
96.0g
8
Atomic orbital is
პასუხი
(B)
a region around the nucleus where electrons are most likely to be found
9
The property of elements which increases down a group of the periodic table is
პასუხი
(C)
ionic radius
10
The reason for the decrease in the atomic size of elements across a period is that
პასუხი
(A)
nuclear charge increases while the outermost electrons are drawn closer to the nucleus
11
The oxidation number of nitrogen in \(Pb(NO_{3})_{2}\) is
პასუხი
(D)
+5
12
Which of the following arrangements indicates the correct decreasing order of ionization energy of period 3 elements?
პასუხი
(B)
Cl, P, Al, Na
13
Which of the following metals has the strongest metallic bond?
პასუხი
(A)
\(_{13}Al\)
14
Which of the following substances does not have van der Waals' forces?
პასუხი
(A)
Copper
15
The oxidation number of X in \(XO_{4}^{3-}\) is
პასუხი
(D)
+5
16
The ionization energy is affected by the following factors except
პასუხი
(C)
ability to attract shared electron(s)
17
Which of the following statements is correct?
პასუხი
(D)
Ionic compounds in solution would conduct electricity
18
The bond angle in tetrahedral molecules such as tetrachloromethane is
პასუხი
(B)
109.5°
19
The properties of a good primary standard include the following except
პასუხი
(B)
low molecular mass
20
The use of diamond in abrasives is due to its
პასუხი
(B)
hardness
21
Which of the following statements about endothermic reaction is correct?
პასუხი
(D)
Heat energy is absorbed
22
A 0.1\(moldm^{-3}\) solution of sodium hydroxide was diluted with distilled water to 0.001\(moldm^{-3}\). What is the dilution factor?
პასუხი
(B)
100.00
23
Graphite and Diamond are similar in that they
პასუხი
(C)
form carbon(IV) oxide on combustion
24
In a saturated solution at a given temperature, the undissolved solutes are in equilibrium with
პასუხი
(B)
dissolved solute particles
25
The number of atoms present in 2.5moles of a triatomic gas is equivalent to [1mole = \(6.02\times 10^{23}\)]
პასუხი
(C)
\(1.5\times 10^{24}\)
26
When Magnesium reacts with oxygen, heat is
პასუხი
(C)
evolved and the reaction is exothermic
27
Which of the following gases is not acidic?
პასუხი
(D)
CO
28
A hydrocarbon contained 14.3% hydrogen. The empirical formula for the hydrocarbon is [H= 1.0, C= 12.0]
პასუხი
(B)
\(CH_{2}\)
29
Which of the following statements is NOT a chemical property of an acid?
პასუხი
(A)
Evolution of ammonia when heated with ammonium salts
30
Halogens generally react with metals to form
პასუხი
(D)
salts
31
Potassium Chloride solid does not conduct electricity because
პასუხი
(B)
strong cohesive forces make its ions immobile
32
When water was added to a white anhydrous substance X, the colour changed to blue. X is
პასუხი
(A)
\(CuSO_{4}\)
33
Solubility curve can be used in the determination of the
პასუხი
(C)
amount of solid drugs in a given solution
34
If 0.2g of a salt is required to saturate 200\(cm^{3}\) of water at room temperature, what is the solubility of the salt?
პასუხი
(B)
1.0\(gdm^{-3}\)
35
The property of a chemical reaction that is affected by the presence of a catalyst is
პასუხი
(A)
activation energy
36
Soluble salts can be prepared by the following methods except
პასუხი
(C)
double decomposition
37
Chemical reactions occurs when the colliding reactants have energy that is
პასუხი
(B)
greater than the activation energy
38
The common feature of reactions at the anode is that
პასუხი
(C)
oxidation is involved
39
Consider the following reaction equation: \(2NO_{(g)} + O_{{2}{(g)}} \to 2NO_{{2}{(g)}}\). What is the change in the oxidation number of nitrogen?
პასუხი
(C)
+2 to +4
40
Which of the following factors characterize members of the same homologous series?
პასუხი
(D)
Successive members undergo changes in molecular formula by \(CH_{2}\)
41
Calculate the mass of copper deposited if a current of 0.45A flows through \(CuSO_{4}\) solution for 1hour 15mins. [Cu=64.0, S= 32.0, O =16.0, 1F= 96500C]
პასუხი
(B)
0.67g
42
Classification of alkanols is based on the
პასუხი
(D)
number of alkyl groups bonded to the carbon having the hydroxyl group
43
The name of the compound \(C_{4}H_{9}COOC_{3}H_{7}\) is
პასუხი
(A)
propyl pentanoate
44
Which of the following pairs of gases are pollutants from car exhaust?
პასუხი
(C)
Carbon(II) oxide and Sulphur(IV) oxide
45
Fats and oils can be obtained from any of the following sources except
