Jamb past question | Chemistry 1983 JAMB Questions

Our unified Tertiary matriculation examinations (jamb/ utme) past questions and answers for chemistry are compiled for a significant number of prior written exams given by the joint admission and matriculation board (jamb), which was formerly known as the joint admission and matriculation board (utme)

Chemistry 1983 JAMB Questions

1.X is crystalline salt of sodium. Solution of X in water turns litmus red produces a gas which turns limewater milky when added to sodium carbonate.With barium chloride solution, X gives a white precipitate which is insoluble in dilute hydrochloric acid. X is

A.Na2,CO3

B.NaHCO3

C.NaHSO4

D.Na2SO3

E.Na2SO4

2.The Alkanol obtained from the production of soap is

A.ethanol

B.glycerol

C.methanol

D.propanol

E.glycol

3.The flame used by welders In cutting metals is

A.butane gas flame

B.acetylene flame

C.kerosene flame

D.oxyacetylene flame

E.oxygen flame

Also read: Jamb past questions and answers | JAMB 1990 biology Questions and answers

4.Consecutive members of a alkane homologous series differ by

A.CH

B.CH2

C.CH3

D.CnHn

E.CnH2n+2

5.If an element has the electronic configuration 1s² 2s² 2p⁶ 3s² 3p³, it is

A.a metal

B.an alkaline earth metal

C.an s block element

D.a p block element

E.a transition element

6.Some copper (11) sulphate pentahydrate (CuSO45H2O), was heated at 120⁰C with the following results: Wt of crucible=10.00g; Wt of crucible + CuSO4 5H2O=14.98g;Wt of crucible + residue=13.54g. How many molecules of water of crystallization were lost?[H=1,Cu=63.5,O=16,S=32]

A.1

B.2

C.3

D.4

E.5

JAMB physic Syllabus 2023/2024 (Read & Download PDF)

7.The three dimensional shape of methane is

A.hexagonal

B.tigonal

C.linear

D.tertrahedral

E.cubical

Question 8-10 are based on the following

An unknown organic compound has a relative molecular mass of 180. It's a colourless crystalline solid, readily soluble in water. X contains the element C,H, and O in the atomic ratio 1:2:1.The compound has a sweet taste and melts on heating. In the presence of yeast And in the absence of air X is converted to compound Y in the absence of air, X is converted to compound Y and colourless gas.

Compound Y reacts with sodium metal to produce a gas Z which gives a ‘pop’ sound with a glowing splint.

Y also reacts with ethanol acid to give a sweet smelling compound W.

8.Compound W is

A.a soap

B.an oil

C.an alkane

D.anester

E.sucrose

9.The molecular formula of X is

A.C12H22O11

B.C6H12O6

C.C3H6O3

D.C7H14O7

E.C4H3O4

10.reaction of X with yeast forms the basic of the

A.plastic industry

B.textile industry

C.brewing industry

D.soap industry

E.dyeing industry.

11.A mixture of common salt, ammonium chloride and barium sulphate can a best separated by

A.addition of water followed by filtration then sublimation

B.addition of water followed by sublimation then filtration

C.sublimation followed by addition of water then filtration

D.fractional distillation

E.fractional crystallization.

12.Which of the following relationships between the pressure P, the volume V and the temperatures T, represents and ideal gas behaviors?

A.P&VT

B.P&T/V

C.PT& V

D.PV&VT

E.P &V/T

13.

In the above experiment (fig1) the litmus paper will initially

A.be bleached

B.turn green

C.turn red

D.turn blue

E.turn black

14.The colour imparted to aflame calcium ion is

A.green

B.blue

C.brick-red

D.yellow

E.lilac

15.In the reaction M + NP; H=+QkJ. Which of the following would increase the concentration of the product?

A.Decreasing the concentration of N

B.Increasing the concentration of P

C.Adding a suitable catalyst.

D.Decreasing the temperature

16.In which of the following processes is iron being oxidized?

1.Fe+ H2SO4 ➡️H2 + FeSO4

2.FeSO4 + H2S ➡️ FeS+ H2SO4

3 FeCl + CI2 ➡️ 2FeCL3

4FeCl3 + SnCI2 ➡️ 2FeCL2 +SnCI4

A.1only

B.2only

C.3only

D.1and 3

E.2and4.

17.

Fig.2

In the above experiment (fig.2), a current was passed for 10minutes and 0.63g of copper was found to be deposited on the cathode of CuSO4 cells.The weight of AgNO3 cell during the same period would be [Cu =63,Ag–108]

A.0.54 g

B.1.08 g

C.1.62 g

D.2.16 g

E.3.24 g

18.In the reaction Fe + Cu2 + Fe2 + +Cu, iron displaces copper ions to form copper. This due to the fact that

A.iron is in the metallic form while the copper is in the ionic form

B.the atomic weight of copper is greater than that of ion

C.copper metal has more electrons than ion metal

D.iron is an inert metal

E.iron is higher in the electrochemical series than copper.

19.C2H5---C=CH2

CH3

The correct name of the compound with the above structural formula is

A.2-methylbut-1-ene

B.2-methylbut-2-ene

C.2-methylbut-1-ene

D.2-ethyprop-1-ene

E.2-ethylprop-2-ene

20.How many isomeric forms are therefore molecular formula C3H6Br2?

A.1

B.2

C.3

D.4

E.5

21.A piece of burning sulphur will continue to burn in a gas jar of oxygen to give mIsty fume which readily dissolve in water. The resulting liquid is

A.sulphur(1V)trioxide

B.Tetraoxosulphateacid(V1)

C.Trioxosulphate(1V)acid

D.Dioxosulphate(11)acid

E.Hydrogensulphide

22.Sodium decahydrate (Na2SO4

10H2O) an exposure to air loses all its water of crystallization.The process of loss is known as

A.Efflorescence

B.Hygroscopy

C.Deliquescence

D.Effervescence

E.Dehydration

23.Which of the following happens during the electrolysis of molten sodium chloride?

A.Sodium ion loses an electron

B.Chlorine atom gains an electron

C.Chloride ion gains an electron

D.Sodium ion is oxidized

E.Chloride ion is oxidized.

24.Crude petroleum pollutant usually seen on some Nigeria creeks and waterways can be dispersed or removed by.

A.heating the affected parts order to boil off the petroleum

B.mechanically stirring to dissolve the petroleum in water

C.pouring organic solvents to dissolve the petroleum

D.spraying the water with detergents

E.cooling to freeze out the petroleum.

25.An element is electronegative if

A.it has a tendency to exist in gaseous form

B.its ions dissolve readily in water

C.it has a tendency to lose electrons

D.it has a tendency to gain electrons

E.it readily forms covalent bonds

26.Solution X, Y, and Z have pH values 3.0, 5.0 and 9.0 respectively. Which of the following statements is correct?

A.All the solution are acidic

B.All solution are basic

C.Y and Z are more acidic than water

D.Y is more acidic than X.

E.Z is the least acidic

27.In the reactions

(1)H2(g)+ 1

2 O2

(g) H 2O(1); H=-2.86kJ

(11)C(s)+ O2

(g)CO2

(g); H=-406kJ

the equation simply that

A.more heat is absorbed heat is evolved in (1)

B.more heat is absorbed in (11)

C.less heat is evolved in (1)

D.reaction (11) proceeds faster than (1)

E.reaction (1) proceeds faster than (11)

28.Which of these metals Mg, Fe, Pb, and Cu will dissolve indilute HCI?

A.All the metals

B.Mg, Fe, and Cu

C.Mg, Fe, and Pb

D.Mg and Fe only

E.Mg only

29.Stainless steel is an alloy of

A.Carbon, iron and lead

B.Carbon, ion and chromium

C.Carbon, iron and copper

D.Carbon, iron, and silver

E.Carbon and iron only

30.What volume of 0.50 MH2SO4 will exactly neutralize 20cm³ of 0.1 MNaOH solution?

A.2.0cm³

B.5.0cm³

C.6.8cm³

D.8.3cm³

E.10.4cm³

31. Which of the following pair of gases will NOT react further with oxygen at a temperature between 30⁰Cand 400⁰C?

A.SO2 and NH3

B.CO2 and H2

C.NO2 and SO3

D.SO3 and NO

E.CO and H2

32. Some metals are extracted from their ores after some preliminary treatments by electrolysis (L) some by thermal reaction (T) and some by a combination of both processes (TL). Which set-up in the following for the extraction of iron copper and aluminum is correct?

A.Iron (L), copper (L) maluminum (T)

B.Iron (T), copper (L), aluminum (T)

C.Ion (TL), copper (TL), aluminium (TL)

D.Iron (L), copper (T), aluminium (T).

E.Ion (T), copper (L), aluminium (TL).

33. In the preparation of some pure crystals of Cu(NO3)2 starting with CuO, a student gave the following statements as step she employed. Which of these shows a flaw in his report?

A.Some CuO was reacted with excess dilute H2SO4

B.The solution was concentrated

C.When the concentrate was cooled, crystals formed were removed by filtration.

D.The crystals were washed with very cold water

E. The crystals were then allowed to dry.

34.Which of the following separation processes is most likely to yield high-quality ethanol (>95%) from palm wine?

A.Fractional dilation without a dehydrant

B.Simple distillation without a dehydrant

C.Fractional distillation with a dehydrant

D.Column chromatography

E.Evaporation

35.Increasing the pressure of a gas

A.lowers the average kinetic energy of the molecules

B.decreases the density of the gas

C.decreases the temperature of the gas

D.increases the density of the gas

E.increases the volume of the gas.

36. 2.5g of hydrated barium salt gave on heating, 2.13 g of the anhydrous salt. Given that the relative molecular mass of the anhydrous salt is 208, the number of molecules of water of crystallization of the barium salt is

A.10

B.7

C.5

D.2

E.1

37. 3.06g of a sample of potassium trioxochlorate (v) (KCIO3) was required to make a saturated solution with 10cm³ of water at 25⁰C.The solubility of the salt at 25⁰C is [K=39,CI=35.5,O=16]

A.5.0 molesdm³

B.3.0molesdm³

C.2,5molesdm³

D.1.0molesdm³

E.0.5molesdm³

38.The cracking process is very important in the petroleum industry because it

A.gives purer products

B.Yields more lubricants

C.Yields more engine fuels

D.Yields more asphalt

E.Yield more candle wax

39.A gas that a behave as reducing agent towards chlorine and as an oxidizing agent toward hydrogen sulphide is

A.O2

B.NO

C.SO2

D.NH3

E.CO2

40.Which of the following solutions will give a white precipitate with barium chloride solution and a green flame test?

A.Na2SO4

B.CuSO4

C.CaSO4

D.CaCI2

E.(NH4)2 SO4

41.The mass of an atom is determined by

A.its ionization potential

B.its electrochemical potential

C.the number of protons

D.the number of neutrons and electrons

E.the number of neutrons and electrons

42.Which of the following is neutralization reaction?

A.Addition of chloride solution

B.Addition of trioxonirate (V) acid (nitricacid) to distilled water.

C.Addition of trioxonirate (V) acid (nitricacid)

to tetraoxosulphate (V1) acid (sulphuricacid).

D.Addition of trioxonirate (V) (potassiumnitrate)

is formed at 40⁰C solution

E.Addition of trioxonirate (V) acid (nitricacid)

potassium hydroxide solution.

43.A jet plane carrying 3,000kg of ethane burns off all the gas forming water and carbondioxide.If all the carbondioxide is expelled and the water formed is condensed and kept on board the plane,then the gain in weight is

A.1,800kg

B.900kg

C.600kg

D.2,400kg

E.1,200kg

44.Liquid X, reacts with sodium trioxocarbonate (IV) (Na2CO3) to give a gas which turns calcium chloride solution milky. X is

A.Na2SO4(aq)

B.KI(ag)

C.An alkali

D.An acid

E.A hydrocarbon.

45.Which of the following statements is false?

A.copper (11) ion can be reduced to copper (1) ion hydrochloric acid and zinc.

B.Sodium metal dissolves in water giving oxygen

C.Nitrogen is insoluble in water

D.Carbondioxide is soluble in water

E.Lead has a higher atomic weight than copper

46. When sodium dioxonitrate (111) (HaNO2) dissolves is

A.Exothermic

B.Endothermic

C.Isothermic

D.Isomeric

E.Hydroscopic

47. The equilibrium reaction between copper (1) chloride and chloride at 25⁰C and 1atmosphere is represented by the equation:

2CuCI2 + CI2 🔛2CuCI2

H=-166kJ.Which of the following statement is TRUE for the reaction, pressure remaining constant.

A.More CuCI2

B.More CuCI2 is formed at 10⁰C

C.Less CuCI2 is formed at 10⁰C

D. there is no change CuCI2 formed at 40⁰C and 10⁰C

E.More CuCI2 is consumed at 40⁰C

48. Zn + H2SO4➡️ ZnCI2 + H2

The rate of the above reaction will be greatly increased if.

A.the zinc is in the powered form

B.a greater volume of the acids used

C.a smaller volume of the acids used

D.the reaction vessel is immersed in an ice-bath

E.the zinc is in the form of pellets.

49. Zn + H2SO4 ➡️ ZnSO4 + H4

In the above reaction how much zinc will be left undissolve if 2.00g of zinc treated with 10cm³ of 1.0 M of H2SO4? [Zn=65,S=32,O=16,H=1]

A.1.35 g

B.1.00 g

C.0.70 g

D.0.65 g

E.0.06 g

50. 30cm³ of 0.1M AI(NO3)3 solution is reacted with100cm³ of 0.15M of NaOH solution. Which is in excess and by how much?

A.NaOH solution, by 70cm³

B.NaOH solution, by 60cm³

C.NaOH solution, by 40cm³

D.AI(NO3)3, solution by 20cm³

E. solution, by 10cm³

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