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