2018/2019 JAMB Chemistry Practice And Likely Questions And Answers

2018/2019 JAMB Chemistry Practice And Likely Questions And Answers for Jamb examination on Monday 12th, Tuesday 13th, Wednesday 14th, Thursday 15th of March 2018/2019 practical trail questions and answers

Attempt the below questions and answer it properly, it’s time to test yourself​ and score high in jamb, we selected the likely questions to come out this year in mathematics. Study well

First purblished on Jambadmisssion.com.ng

 Please ensure you attempt and give your answers to the questions at once…… ​only answers attempted at once will be recognized and marked​​
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         ​CHEMISTRY​

​Q:1)​ When wood charcoal (an adsorbent) is placed in a gas jar containing a mixture of ammonia and oxygen which has been collected over Mercury, ……..which gas will be adsorbed ??

A. Oxygen gas
B. Ammonia gas
C. Mercury
D. Oxygen & ammonia gas

​Q:2)​ Calculate the volume of CO2 that would be produced from 0.5mole of Fe2O3 according to the following equation
   ​Fe2O3 + 3CO –> 2Fe + 3CO2​
(1mole of a gas occupies 22.4dm at s.t.p)

A. 15dm³
B. 100.8dm³
C. 33.6dm³
D. 150dm³

​Q:3)​ Consider the general equation below ;
X2CO3 (s) —–> X2O (s) + CO2 (g)

The reaction above will ​not​ occur when X is ?

A. Cu
B. Na
C. Mg
D. Zn

​Q:4)​ The following industrial products are manufactured from chemicals derived from COAL except

A. Detergent
B. Dyes
C. Explosives
D. Fertilizers
E. Plastics

​Q:5)​ Calcium oxide is a

A. Strong acid
B. Weak acid
C. Strong base
D. Weak base

​Q:6)​ If the only pollutants found in the atmosphere over a city are oxides of nitrogen, suspended lead compounds, carbon monoxide and high levels of methane, the probable source(s) of the pollution must be

A. Automobile exhaust and biological decomposition

B. Combustion of coal and automobile exhaust

C. Biological decomposition only

D. Combustion of coal, automobile exhaust and biological decomposition

​Q:7)​ A correct electrochemical series can be obtained from ​K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au,​ by interchanging

A. Al & Mg
B. Zn & Fe
C. Zn & Pb
D. Pb & H
E. Au & Hg

​Q:8)​ Complete hydrogenation of ethyne yields

A. Benzene
B. Methane
C. Ethane
D. Ethene
E. Propane

​Q:9)​ A man suspected to being drunk is made to pass his breath into acidified potassium dichromate solution. If his breath carries a significant level of ethanol , the final colour of the solution is

A. Pink
B. Purple
C. Orange
D. Blue-black
E. Green

​Q:10)​ An aqueous solution of a Metal salt, M gives white precipitate with NaOH  which dissolves in excess NaOH with aqueous ammonia, the solution M also gave white precipitate which dissolves in excess ammonia
Therefore the cation in M is

A. Zn²+
B. Ca²+
C. Al³+
D. Pb²+
E. Cu²+

​Q:11)​ Tetraoxosulphate(VI) ions are finally tested using

A. Acidified silver nitrate
B. Acidified barium chloride
C. Lime water
D. Dilute hydrochloric acid
E. Acidified lead nitrate

​Q:12)​ Mixing of aqueous solution of barium hydroxide and sodium’s tetraoxocarbonate (IV) yields a white precipitate of

A. Barium hydroxide
B. Sodium tetraoxocarbonate (IV)
C. Sodium oxide
D. Sodium hydroxide
E. Barium tetraoxocarbonate (IV)

​Q:13)​ An organic compound decolorized acidified KMnO4 solution but failed to react with ammoniacal silver nitrate solution .
The organic compound is likely to be

A. A carboxylic acid
B. An alkane
C. An alkene
D. An alkyne
E. An alkanone

​Q:14)​ Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula

A. NaOH.H2O
B. NaOH.N2
C. Na2CO3
D. NaHCO3
D. NaNO3

​Q:15)​ 5g of ammonium trioxonitrate (V) on dissolution in water cooled it’s surrounding water and container by 1.6KJ.
what is the heat of solution of NH4NO3 ?

A. +51.4KJmol-¹
B. +25.6KJmol-¹
C. +12.9KJmol-¹
D. -6.4KJmol-¹
(N= 14, O= 16 H=1)

​Q:16)​ Complete oxidation of propan-1-ol gives

A. Propanal
B. Propan-2-ol
C. Propan-1- one
D. Propanoic acid

​Q:17)​ Local black soap is made by boiling palm oil with liquid extract of ash.
The function of the ash is to provide the

A. Acid
B. Ester of alkanoic acid
C. Alkali
D. Alkanol

​Q:18)​ There are two forms of lead (II) oxide , PbO.
One is produced by heating lead in air at about 480°C and is known as _________ ​while​ the other one obtained by heating lead in air at 900°C is known as _________

A.) Massicot (reddish-brown) , litharge (yellow)

B. Litharge ( yellow) , massicot (reddish-brown)

C. Massicot (yellow) , litharge ( reddish-brown)

D. Litharge ( reddish-brown), massicot (yellow )

​Q:19)​ The only by-product of the solvay process not used in the process is

A. CO2
B. CaO
C. CaCl2
D. NaCl

​Q:20)​ In the extraction of calcium, some calcium fluoride is introduced to

A. Obtain pure products
B. Stabilize the electrodes
C. Check the Calcium from reacting with chlorine
D. Act as a temperature depressant

​Q:21)​ Calcium reacts directly with nitrogen to form

A. Ca3N3
B. CaN3
C. Ca3N2
D. Ca3N

​Q:22)​ who predicted the absolute scale temperature  ?

A. Boyle
B. Charles
C. Einstein
D. Henry Heisenberg
E. Gay lussac

​Q:23)​ Combustion and neutralization is a ___________and ____________ respectively

A. Exothermic, endothermic
B. Endothermic, exothermic
C. Exothermic, exothermic
D. Endothermic , endothermic

​Q:24)​ Dissolution of salt in water is _____________

A. Endothermic
B. Exothermic

​Q:25)​ If a pH of a solution is greater than 7, then an indicator that would chan colour must have pKa

A. Equal to 7
B. Greater than 7
C. Less than 7

​Q;26)​ Indicator suitable to use for reaction between strong acid and weak base is ___________ while that of weak acid and strong base is ____________

A. Phenolphthalein, methyl orange

B. Methylorange, phenolphthalein

​Q:27)​ The power source of an electrolytic current is

A. Direct current source (DC)
B. Alternating current source (AC)

​Q:28)​0.32g of methane raised the temperature of 100g of water in a bomb calorimeter by 80°C after burning completely. What is the heat of combustion of methane as obtained from this experiment
(C= 4.2Jg-¹°C-¹)

A. +1680KJmol-¹
B. -33.6KJmol-¹
C. -1680JKmol-¹
D. +33.6KJmol-¹

​Q:29)​ The heat of combustion of propane (C3H8) is -2211KJmol-¹.
Calculate the heat of formation of the compound, given that ∆Hf (CO2) and ∆Hf (H2O) are -393 & -286KJmol-¹ respectively.

A. +112KJmol-¹
B. -112KJmol-¹
C. -2176KJmol-¹
D. +2176KJmol-¹

​Q:30)​ calculate the intrinsic energy for
I) Propane (C3H8)
II) Ethene (C2H4)

Given that the bond energy of C-H is 410.5KJmol-¹, bond energy of C-C (single carbon bond) is 336.0KJmol-¹ and bond energy of C_–C (double carbon bond ) is 606.1KJmol¹

​Q:31)​ which of the following reactions is accompanied by decrease in entropy when carried out at constant temperature ?

A. MgCO3 (s) <____–––> MgO (s) + CO2 (g)

B. N2H4 (g) <____–––> 2NO2 (g)

C. N2H4 (l) + N2O (g) <___–––> 3H2 (g) + 4H2O (g)

D. 2SO2 (g) + O2 (g) <____—–>  2SO3 (g)

​Note that this sign <____——> represents a reversible reaction​

​Q:32)​ The entropy change is positive in the process

A. H2 (g) + I2 (g) –––> 2HI (g)

B. H2O (l) –––> H2O (g)

C. Zn (s) + Cu²+ –––> Zn²+ (aq) + Cu (s)

D. N2 (g) + 3H2 (g) –––> 2NH3 (g)

​Q:33)​ which of the following elements produces effervescence when in contact with water ?

A. Lead
B. Calcium
C. Copper
D. Silver

​Q:34)​ On strong heating, a solid decomposed to give off brown fumes and left a yellow residue which turns white on cooling. The solid is

A. Cu(NO3)2
B. Pb(NO3)2
C. Ca(NO3)2
D. Zn(NO3)2

​Q:35)​ Carbonyl compounds can be distinguished from compounds of other families by use of

A. Tollen’s reagent

B. 2,4 – dinitrophenylhydrazine

C. Sodium tetrahydridoborate (III)

D. Clemmenson’s reagent

​Q:36)​ what is the value of x in Fe(NH4)2(SO4)2 . xH2O  if molar mass is 392gmol-¹ ?

{Fe= 56, N= 14, S=32, O=16 H=1}

A. 2
B. 4
C. 5
D. 6

​Q:37)​ The ratio of the rates diffusion of two gases E and F is 1:4, if the relative molecular mass of E is 32, calculate the relative molecular mass of F.

A. 2
B. 4
C. 16
D. 64

​Q:38)​ At s.t.p, 50cm³ of CO2 and 50cm³ of CO have the same

A. Rate of diffusion
B. Mass
C. Density
D. Number of molecules

​Q:38.)​ A property that decreases across a period and increases down a group in the periodic table is

A. Ionization energy
B. Electron affinity
C. Atomic radius
D. Atomic number

​Q:39)​ Two elements G and H have electronegativity values 0.8 and 3.2 respectively.
What is the bond type present in the compound when the two elements combine ?

A. Covalent
B. Coordinate covalent
C. Ionic
D. Metallic

​Q:40)​ Which of the following has the highest degree of hardness ?

A. Rain water
B. Lake water
C. Borehole water
D. River water

​Q:41)​ The conversion of sulphur to tetraoxosulphate(VI) acid by contact process is schematically represented as :
S–>SO2–>SO3–>H2S2O7–> H2SO4
The correct change of the  oxidation state of sulphur at each stage of the above scheme is

A. +4, +1, +1, 0
B. +2, +4, +2, +2
C. +2, +4, 0, 0
D. +4, +2, 0, 0

​Q:42)​ An oxide which is reduced when heated in a stream of hydrogen is

A. K2O
B. Fe2O3
C. CaO
D. CuO

​Q:43)​ what are the products formed when an aqueous solution of chlorine is exposed to sunlight ?

A. Cl2 (g) and H2 (g)
B. HCl (aq) and O2 (g)
C. HClO (aq) and Cl2 (g)
D. HClO (aq) and O2 (g)

​Q:44)​ How many structural isomers can be drawn for the bromoalkane with molecular formula C5H11Br ?

A. 4
B. 6
C. 8
D. 10

​Q:45)​ The reaction of 2,2 – dimethylpropan-1-ol with excess acidified K2Cr2O7 solution under reflux yields

A. (CH3)3 CCOOH

B. CH3 C(CH3)2CHO

C. (CH3)2CHCOCH3

D. (CH3)2CHOCH2CH3

​Q:46)​ what is the Moseley’s contribution to the development of atomic theory ?

A. Determination of charge -to-mass ratio

B. Discovery of electrons

C. Determination of atomic numbers

D. Determination of electronic charge

​Q:47)​  An effective method of treating municipal water supply for microorganisms is

A. Ion exchange
B. Addition of alum
C. Chlorination
D. Passage through fine sands

​Q:48)​ 1.104g of a divalent metal X is deposited when a current of 5A is passed through a solution of it for 30minutes , using appropriate electrodes.
What is the relative atomic mass of the metal ?

A. 24
B. 40
C. 64
D. 207

​Q:49)​ The laboratory apparatus for bubbling a gas into a liquid is

A. Liebig condenser
B. Aspirator
C. Funnel
D. Delivery tube

​Q:50)​ Proteins

A. Form brick-red precipitate with Fehling’s solution

B. Hydrolyze to yield amines

C. Are giant molecules

D. Conform to the general formula H2N–CH(R)–COOH

………. ​THE END​

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Everyone that attempt the questions ​at once​ shall be marked and be typed his or her score immediately BUT the correction (with explained answers) will be available soon

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