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