BATCH 1. 7:00AM (14th March) 2024 JAMB CBT CHEMISTRY QUESTIONS AND ANSWERS
BATCH 1. 7:00AM (14th March) 2024 JAMB CBT CHEMISTRY QUESTIONS AND ANSWERS
*1 :- the element with an electron configuration 1s2 2s2 2p6 3s23p64s2*
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 = 25s
*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 = permute
*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 polymerization*
*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 aerodrome 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 solubility 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 electricity 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 ore 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
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