Which of the following sugars is a product of the condensation of monosaccharides?
Răspuns
(B)
maltose
3
The cleansing effect of soap is low in acidic water because of
Răspuns
(A)
the formation of unionized fatty acid.
4
The following compounds are condensation polymers except
Răspuns
(D)
polyethene
5
What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?
Răspuns
(C)
Three Faradays
6
Which of the following compounds would react rapidly with bromine?
Răspuns
(C)
Hexene
7
Alkanols can be manufactured from alkenes by the initial reaction of alkenes with
Răspuns
(B)
concentrated tetraoxosulphate(VI) acid
8
Which of the following statements about the standard hydrogen electrode is not correct?
Răspuns
(D)
The temperature is kept at 20 °C
9
If 60 g of M combines with 24 g of oxygen, what would the empirical formula of the oxide be?
( molar mass of M = 120, O = 16)
Răspuns
(C)
MO\(_{3}\)
10
The products of the electrolysis of dilute sodium chloride using carbon electrodes are
Anode Cathode
Răspuns
(B)
oxygen and hydrogen.
11
Determine the quantity of electricity used when a current of 0.20 amperes is passed through an electrolytic cell for 60 minutes.
Răspuns
(D)
720C
12
Oxochlorate(I) acid is used as a bleaching agent because it is
Răspuns
(C)
an oxidizing agent
13
The IUPAC name for CH\(_{3}\)CHCH\(_{3}\)CHCLCHCH\(_{3}\)CH\(_{2}\)CH\(_{3}\) is
Răspuns
(D)
3 - chloro - 2, 4 - dimethylhexane
14
A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn
Răspuns
(B)
acidified KMnO\(_{4}\) solution colourless
15
If 5.0 g of marble reacts with 25.0 cm3 hydrochloric acid, which of the following combinations has the fastest reaction rate?
Răspuns
(C)
Powdered marble and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
16
Increasing the temperature generally
Răspuns
(B)
increases the solubility of a solid in a liquid but decreases the solubility of a gas in a liquid.
17
A white precipitate was formed when BaCl\(_{2(aq)}\) was added to an aqueous solution
of a salt X. The precipitate dissolved in dilute HCl with rapid effervescence. Salt X is likely to contain
Răspuns
(B)
SO\(_{3}\) \(^{2-}\) ions
18
Before a reaction could take place, there should be
Răspuns
(C)
breakage of bonds of reactants
19
Consider the following reaction equation:
CaO + SiO\(_{2}\) ------> CaSiO\(_{3}\)
Silicon(IV) oxide is acting as
Răspuns
(C)
an acidic oxide
20
Which of the following acids would form normal salt only?
Răspuns
(B)
Trioxonitrate(V) acid
21
What is the partial pressure of oxygen at s.t.p. in a gaseous mixture containing 100 cm3 of oxygen and 900 cm3 of nitrogen gas?
Răspuns
(B)
0.1 atm
22
Graphite is used as a dry lubricant due to the presence of
Răspuns
(D)
layered structures
23
Which of the following gases is alkaline?
Răspuns
(C)
NH\(_{3}\)
24
Which of the following statements about an equilibrium system is correct?
Răspuns
(A)
Forward and backward reactions occur
at the same rate
25
Consider the following reaction equation
N\(_{2}\)(g) + 3H\(_{2(g)}\) ⇌ 2NH3(g) ∆H = -92kJ
Increasing the temperature of the reaction would
Răspuns
(D)
decrease the yield of ammonia
26
When air in a syringe is compressed such that there is no change in temperature, the
Răspuns
(B)
pressure increases
27
Which of the following statements about liquids is/are true?
I. Liquids maintain their volume at constant temperature.
II. Liquids have fixed shape
III. Liquids do not diffuse
IV. Change in pressure affects volume of liquids
Răspuns
(A)
I only
28
A hydrogen chloride gas reacted with oxygen gas to yield water and chlorine gas. The mole ratio of the hydrogen chloride gas to water is
Răspuns
(B)
2:1
29
What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm\(^{3}\) cylinder?
[R=0.082 atm dm\(^{-3}\) mol\(^{-1}\) K\(^{-1}\)]
Răspuns
(C)
3.13
30
If 50 cm\(^{3}\) of a saturated solution of KNO\(_{3}\) at 40 °C contained 5.05 g of the salt, its solubility at the same temperature would be
[KNO\(_{3}\) = 101]
Răspuns
(A)
1.0 mol dm\(^{-3}\)
31
Which of the following elements would displace copper from a solution of copper ions?
Răspuns
(C)
lead
32
What is the percentage composition of carbon
in Ca(HCO3)\(_{2}\) ?
[ Ca = 40.0, 0= 16.0, C = 12.0, H= 1.0]
Răspuns
(B)
14.8%
33
Which of the following bond types is intermolecular?
Răspuns
(B)
Hydrogen bond
34
The maximum number of covalent bonds formed by nitrogen is
Răspuns
(D)
4
35
The IUPAC name of the compound CH3CH(CH3)CHCH2 is
Răspuns
(C)
3 - methyl but - 1 - ene
36
Ionization energy increases across the period in the periodic table because
Răspuns
(B)
effective nuclear charge increases
37
Which of the following properties indicate that an element is a metal. It
I. reacts with oxygen to form an acidic oxide
II. forms ionic chlorides
III. has variable oxidation states
IV. displaces hydrogen from dilute HCl
Răspuns
(C)
II and IV only
38
The electron configuration of carbon atom in its excited state is
