2018 JAMB CBT 3:00pm CHEMISTRY QUESTIONS AND ANSWERS

CHEMISTRY – 3PM

1 :- the element with an electron configuration 1s2 2s2 2p6 3s23p64s2
CORRECT ANSWER =
a noble gas
2 :- ethanoic acid is monobasic because its
CORRECT ANSWER =
has one replaceable hydrogen molecule
3 :- the type of bond in nitrogen molecule is
CORRECT ANSWER =
covalent
4 :- in the hydrogenation of benzene, the catalyst used is
CORRECT ANSWER =
Ni
5 :- the acid found in sour milk is
CORRECT ANSWER =
lactic acid
6 :- transition metals with higher oxidation state will form oxides that are
CORRECT ANSWER =
basic
7 :- the iupac nomenclature of the compound above is
CORRECT ANSWER =
pent-2-yne
8 :- in the diagram above X is
CORRECT ANSWER =
H2
9 :- if 200cm3 of oxygen passes through a porous plug in 100sec.find the time taken for the same volume of hydrogen to pass through the same porous plug
CORRECT ANSWER =
25
10 :- the method used in purifying sugar is
CORRECT ANSWER =
crystallization
11 :- the activation energy of a chemical reaction can be lowered by
CORRECT ANSWER =
the addition of a catalyst
12 :- in the equation above X is
CORRECT ANSWER =
CH3COOCH2CH3
13 :- a solubility curve is a plot of the solubility of solute against
CORRECT ANSWER =
TEMPERATURE
14 :- the method that is not economical for the removal of hardness in water for town supply is
CORRECT ANSWER =
permutit
15 :- in the electrolytic extraction of sodium from fused sodium chloride calcium chloride is usually added to
CORRECT ANSWER =
remove impurities
16 :- grades of petrol having octane number nearer zero will cause a motor car engine to ‘
CORRECT ANSWER =
17 :- nickel is plated on steel to
CORRECT ANSWER =
increase its strength
18 :- the solubility in mol/dm3 of 20.2g of potassium trioxonitrate(V)dissolved in 100g of water at room temperature is
CORRECT ANSWER =
2
19 :- what is the atomic number of an element having 127 neutrons and 82 electrons
CORRECT ANSWER =
82
20 :- 28.80CM3 OF NITROGEN AT 15c is cooled to 0C.its volue ar constant pressure is
CORRECT ANSWER =
27.3
21 :- what physical property of alkane decreases as the number of carbon atoms increases
CORRECT ANSWER =
solubility
22 :- which of the following substances are made by polymeriztion
CORRECT ANSWER =
nylon and artificial rubber
23 :- which of the following compounds is unsaturated
CORRECT ANSWER =
methylbenzene
24 :- a compound contains 31.9% potassium 28.93 chlorine and the remaining oxygen.what is the chemical formula of the compound?\
CORRECT ANSWER =
KClO2
25 :- the use of neon light in aerodome beacons is due to its
CORRECT ANSWER =
COLOUR
26 :- K4Fe(CN)6 is an example of a
CORRECT ANSWER =
complex
27 :- if T change in s is small relative to change in H at room temperature the value of change in G will be
CORRECT ANSWER =
positive
28 :- the solibility of alkanols in water is due to the presence of
CORRECT ANSWER =
hydroxyl group
29 :- when lubricating oil is redistilled,it yields
CORRECT ANSWER =
petroleum jelly
30 :- the iupac nomenclature of K2Cr2O7 SI
CORRECT ANSWER =
potassium heptaoxochromate(VI)
31 :- ALKYNES BURN WITH SMOKY LUMINOUS FLAME DUE TO HIGH
CORRECT ANSWER =
carbon content
32 :- ozone is known for its ability to
CORRECT ANSWER =
attack the respiratory tract of organisms
33 :- which of the following properties is peculiar to graphite?
CORRECT ANSWER =
it is unreactive
34 :- calculate the amount in moles of zinc that will be deposited by passing 10 faradays of elctricity through a solution of zinc salt
CORRECT ANSWER =
5
35 :- the air pollutant that dissolves in water due to produce acid rain is
CORRECT ANSWER =
O3
36 :- the property pecuiliar to pure oxygen is that it
CORRECT ANSWER =
is lighter than air
37 :- the principal property that determines the method of an extraction of a metal from its oe is its
CORRECT ANSWER =
position in the activity series
38 :- when water is added to calcium oxide,it forms
CORRECT ANSWER =
calcium hydroxide
39 :- in the reaction above, the reverse reaction can be favored by
CORRECT ANSWER =
decreases the temperature
40 :- an element with electron configuration 1s2 2s2 2p6 3s2 3p4 belongs to the
CORRECT ANSWER =
p-block

17 Comments

  1. I thank you so much sir but am having my papers on monday by 1 30 please sir I need phy chem math and english or even math and chem please sir if I see it in exam hall I will personally send you my appreciation

  2. pls bcus of almighty can i ve english,mathematics,biology pls i ve my exam by 07:00am pls can u send it for me tonight plssss bcus of allah sake

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