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