The energy change which accompanies the addition of an electron to a gaseous atom is
Răspuns
(B)
electron affinity
3
Which of the following elements is a d-block element?
Răspuns
(B)
lron
4
Which of the following statements about chlorine and iodine at room temperature is correct?
Răspuns
(A)
Chlorine is gas and iodine is solid
5
If X is a group lll element, its oxide would be represented as
Răspuns
(C)
X2O3
6
Which of the following species correctly represented an ion of M with 13 protons and 10 electrons?
Răspuns
(C)
13M 3+
7
A solid substance with high melting and boiling points is likely to be a/an
Răspuns
(C)
electrovalent compound
8
Which of the following molecules has a linear shape?
Răspuns
(B)
CO 2
9
Which of the following molecules has a triple bond in its structure?
Răspuns
(C)
N2
10
The bonds in crystaline ammonium chloride are?
Răspuns
(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
Răspuns
(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]
Răspuns
(A)
0.4 mol dm-3
13
What is the volume occupied by 2 moles of ammonia at s.t.p?
Răspuns
(A)
44.8 dm-3
14
Which of the following apparatus can be used to measure accurately a specific volume of a liquid?
Răspuns
(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]
Răspuns
(C)
9.4 seconds
16
Which of the following gases contains the highest number of atoms at s.t.p?
Răspuns
(A)
6 moles of neon
17
The determination of heat of combustion is carried out with
Răspuns
(B)
a bomb calorimeter
18
The minimum amount of energy required for effective collisions between reacting particles is known as
Răspuns
(A)
activation energy
19
Which of the following oxides is basic?
Răspuns
(D)
CaO
20
Which of the following equimolar solutions would have the highest conductivity?
Răspuns
(B)
NaNO3(aq)
21
The following substances are normal salts except
Răspuns
(C)
Mg(OH)NO3
22
Which of the following chlorides is insoluble in water?
Răspuns
(A)
AgCI
23
Which of the following factors would not affect the solubility of a gas?
Răspuns
(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?
Răspuns
(C)
Decrease in pressure increases the equilibrium concentration of O2
25
The rate of chemical reaction of solids are not affected by
Răspuns
(B)
pressure
26
Which of the following statements about the cell notation Mg/Mg\(^{2+}\)//Cu\(^{2+}\)/Cu is correct?
Răspuns
(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?
Răspuns
(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)
Răspuns
(D)
+ 7 to 2
29
The quantity of electricity required to discharge 1 mole of univalent ion is
Răspuns
(C)
96,500 C
30
Fact and oils are used as raw materials in the following industries except
Răspuns
(B)
plastic industry
31
An advantage of detergent over soap is that detergents
Răspuns
(D)
lather readily with water
32
The products of fermentation of sugar are
Răspuns
(B)
ethanol and carbon (IV) oxide
33
The IUPAC name of C2H6COOC2,/sub>H6 is
Răspuns
(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]
Răspuns
(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
