The energy change which accompanies the addition of an electron to a gaseous atom is
Відповідь
(B)
electron affinity
3
Which of the following elements is a d-block element?
Відповідь
(B)
lron
4
Which of the following statements about chlorine and iodine at room temperature is correct?
Відповідь
(A)
Chlorine is gas and iodine is solid
5
If X is a group lll element, its oxide would be represented as
Відповідь
(C)
X2O3
6
Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?
Відповідь
(C)
13M 3+
7
A solid substance with high melting and boiling points is likely to be a/an
Відповідь
(C)
electrovalent compound
8
Which of the following molecules has a linear shape?
Відповідь
(B)
CO 2
9
Which of the following molecules has a triple bond in its structure?
Відповідь
(C)
N2
10
The bonds in crystaline ammonium chloride are?
Відповідь
(C)
ionic covalent and dative
11
Consider the neutralization reaction represented by the following equation: Na2CO3 + 2HNO 3 → 2NaNO3 + H2O + CO2 The stoichiometric ratio of acid to base is
Відповідь
(B)
2:1
12
A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm3 of solution. Calculate the concentration of the solution. [Na2CO3 = 106.0]
Відповідь
(A)
0.4 mol dm-3
13
What is the volume occupied by 2 moles of ammonia at s.t.p?
Відповідь
(A)
44.8 dm-3
14
Which of the following apparatus can be used to measure accurately a specific volume of a liquid?
Відповідь
(D)
Pipette
15
A given volume of oxygen diffused through a porous partition in 8 seconds. How long would it take the same volume of carbon (IV) oxide to diffuse under the same condition? [C = 12.0, O = 16.0]
Відповідь
(C)
9.4 seconds
16
Which of the following gases contains the highest number of atoms at s.t.p?
Відповідь
(A)
6 moles of neon
17
The determination of heat of combustion is carried out with
Відповідь
(B)
a bomb calorimeter
18
The minimum amount of energy required for effective collisions between reacting particles is known as
Відповідь
(A)
activation energy
19
Which of the following oxides is basic?
Відповідь
(D)
CaO
20
Which of the following equimolar solutions would have the highest conductivity?
Відповідь
(B)
NaNO3(aq)
21
The following substances are normal salts except
Відповідь
(C)
Mg(OH)NO3
22
Which of the following chlorides is insoluble in water?
Відповідь
(A)
AgCI
23
Which of the following factors would not affect the solubility of a gas?
Відповідь
(A)
Concentration
24
Consider the equilibrium reaction represented by the following equation: 2SO2(g) + O2(g) ⇌ 2SO3(g); ∆H = 395.7 kJmol-1 Which of the following statements about the equilibrium system is correct?
Відповідь
(C)
Decrease in pressure increases the equilibrium concentration of O2
25
The rate of chemical reaction of solids are not affected by
Відповідь
(B)
pressure
26
Which of the following statements about the cell notation Mg/Mg\(^{2+}\)//Cu\(^{2+}\)/Cu is correct?
Відповідь
(C)
Magnesium is the anode
27
Which of the following statements about the electrolysis of CuSO4(aq) using copper cathode and platinum anode is not correct?
Відповідь
(C)
it is used for the purification of copper
28
What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)
Відповідь
(D)
+ 7 to 2
29
The quantity of electricity required to discharge 1 mole of univalent ion is
Відповідь
(C)
96,500 C
30
Fact and oils are used as raw materials in the following industries except
Відповідь
(B)
plastic industry
31
An advantage of detergent over soap is that detergents
Відповідь
(D)
lather readily with water
32
The products of fermentation of sugar are
Відповідь
(B)
ethanol and carbon (IV) oxide
33
The IUPAC name of C2H6COOC2,/sub>H6 is
Відповідь
(B)
ethylproanoate
34
An organic compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. What is the empirical formula of the compound? [O = 16.0, C = 12.0, H = 1.0]
Відповідь
(C)
CH2O
35
Compound N reacts with sodium metal to produce a gas that gives a 'pop' sound with a burning splint N also react with ethanoic acid to give a sweet smelling liquid. Compound N is an
