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