BATCH 1. 7:00AM (14th March) 2020 JAMB CBT CHEMISTRY QUESTIONS AND ANSWERS



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BATCH 1. 7:00AM (14th March) 2020 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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