Which of the following sugars is a product of the condensation of monosaccharides?
Απάντηση
(B)
maltose
3
The cleansing effect of soap is low in acidic water because of
Απάντηση
(A)
the formation of unionized fatty acid.
4
The following compounds are condensation polymers except
Απάντηση
(D)
polyethene
5
What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?
Απάντηση
(C)
Three Faradays
6
Which of the following compounds would react rapidly with bromine?
Απάντηση
(C)
Hexene
7
Alkanols can be manufactured from alkenes by the initial reaction of alkenes with
Απάντηση
(B)
concentrated tetraoxosulphate(VI) acid
8
Which of the following statements about the standard hydrogen electrode is not correct?
Απάντηση
(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)
Απάντηση
(C)
MO\(_{3}\)
10
The products of the electrolysis of dilute sodium chloride using carbon electrodes are
Anode Cathode
Απάντηση
(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.
Απάντηση
(D)
720C
12
Oxochlorate(I) acid is used as a bleaching agent because it is
Απάντηση
(C)
an oxidizing agent
13
The IUPAC name for CH\(_{3}\)CHCH\(_{3}\)CHCLCHCH\(_{3}\)CH\(_{2}\)CH\(_{3}\) is
Απάντηση
(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
Απάντηση
(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?
Απάντηση
(C)
Powdered marble and 2.5 mol dm\(^{-3}\) HCl\(_{(aq)}\)
16
Increasing the temperature generally
Απάντηση
(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
Απάντηση
(B)
SO\(_{3}\) \(^{2-}\) ions
18
Before a reaction could take place, there should be
Απάντηση
(C)
breakage of bonds of reactants
19
Consider the following reaction equation:
CaO + SiO\(_{2}\) ------> CaSiO\(_{3}\)
Silicon(IV) oxide is acting as
Απάντηση
(C)
an acidic oxide
20
Which of the following acids would form normal salt only?
Απάντηση
(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?
Απάντηση
(B)
0.1 atm
22
Graphite is used as a dry lubricant due to the presence of
Απάντηση
(D)
layered structures
23
Which of the following gases is alkaline?
Απάντηση
(C)
NH\(_{3}\)
24
Which of the following statements about an equilibrium system is correct?
Απάντηση
(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
Απάντηση
(D)
decrease the yield of ammonia
26
When air in a syringe is compressed such that there is no change in temperature, the
Απάντηση
(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
Απάντηση
(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
Απάντηση
(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\(^{-1}\)]
Απάντηση
(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]
Απάντηση
(A)
1.0 mol dm\(^{-3}\)
31
Which of the following elements would displace copper from a solution of copper ions?
Απάντηση
(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]
Απάντηση
(B)
14.8%
33
Which of the following bond types is intermolecular?
Απάντηση
(B)
Hydrogen bond
34
The maximum number of covalent bonds formed by nitrogen is
Απάντηση
(D)
4
35
The IUPAC name of the compound CH3CH(CH3)CHCH2 is
Απάντηση
(C)
3 - methyl but - 1 - ene
36
Ionization energy increases across the period in the periodic table because
Απάντηση
(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
Απάντηση
(C)
II and IV only
38
The electron configuration of carbon atom in its excited state is
