JAMB 2023 Chemistry Questions & Answers 2023, Repeated Questions & Likely 2023 Chemistry Questions

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The JAMB 2023 chemistry questions and answers is fast approaching. This article will center purely on you can score high in the 2023 JAMB chemistry questions and answers.

Most people find it difficult to understand chemistry while reading, for this set of people once they read one or two lines they will get exhausted. If you fall in this category then I have only one advice for you, only study chemistry before any other subject at least at this point you are still full of energy and the zeal to read.

Once you start reading, try as much as you can to break your reading, take a few 10 minutes walk around just to refresh your brain.

Key points to Note while Reading for JAMB Chemistry

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Memorize your periodic table

Chemistry periodic tables is a classification of all chemical elements into categories based on their structure. This was done my different notable scientists over the years. As a chemistry student it’s important you have a perfect understanding of the periodic table

Key points for Jamb Chemistry

TRY as much as you can to know the direction of the mass, it’s a general knowledge that Atomic mass will always likely to increase towards your right (from left to right)

Apply Visualize techniques : try to visualize everything you have read so far on the periodic table.

Memorize your formula : just like mathematics chemistry has it own formula and with out you remembering the formula it will be difficult for you to solve any problem that involves a little calculation.
While reading your text books on Jamb chemistry 2022 it’s necessary you read wisely, try ad much as you can you can to understand the pattern jamb uses to set their questions.

Why You should’nt Depend on JAMB Expo

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1. Not reliable :Expo or runs as you chose to call it are not reliable in jamb chemistry 2022 , they might be reliable in other types of exam but with jamb, because a lot has changed over the past 3 years since the introduction of computer base testing..
2. You might be Disappointed: You will definitely be disappointed, because once the expo master or your source couldn’t get the 2022 chemistry questions answers there is nothing he can do again rather than send unverified or even past questions and answers from previous exams.
3. You might be caught : jamb has made it clear that on no account must you bring any incrementing materials into the hall during the exams (jamb chemistry questions and answers for 2022 ) . Once you fail to abide by the rules then you will be seriously dealt with.
4. Security cameras : jamb has successfully mounted security cameras in all cbt centers located in Nigeria, so how are you going to bit those cameras without being caught? You see why you should not depend on expo on chemistry questions and answers for 2021/2022?
5. You might be jailed :those who are of the habit of using expo even in jamb cbt are likely to face 7 years jail if caught and found guilty, please do everything within your power to avoid expo in chemistry questions and answers this year.
6. You might be ban from jamb: jamb has made it clear to ban any candidate who indulge in malpractice, such a candidate won’t be able to register for future jamb exams. Once your finger print is ban then the scanner will reject it and won’t ever capture it again.
7. Your result might be withheld :Each year jamb withheld a large number of candidates results whom they suspect might have indulge in one thing or the other that is against jamb.

JAMB Likely Chemistry Questions and Answers

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5

In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

• A. 5cm³
• B. 10cm³
• C. 20cm³
• D. 25cm³
• E. 50cm³

6

A small quantity of solid ammonium chloride (NH₄Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone

• A. distillation
• B. sublimation
• C. precipitation
• D. evaporation
• E. decomposition

7

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

• A. P will form an electrovalent bond with R
• B. Q will form a covalent bond with S
• C. R will form an electrovalent bond with S
• D. Q will form an electrovalent bond with S
• E. Q will form a covalent bond with R

8

An element X forms the following compounds with chlorine; XCl₄, XCl₃, XCl₂. This illustrates the

• A. law of multiple proportions
• B. law of chemical proportions
• C. law of simple proportions
• D. law of conservation of mass
• E. law of definite proportions

9

The oxidation state of chlorine in potassium chlorate is

• A. +1
• B. +2
• C. +3
• D. +5
• E. +7

10

When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are;

• A. nitrogen and carbondioxide
• B. the rare gases
• C. nitrogen and oxygen
• D. nitrogen and the rare gases
• E. nitrogen, carbondioxide and the rare gases

11

When heat is absorbed during a chemical reaction, the reaction is said to be

• A. thermodynamic
• B. exothermic
• C. isothermal
• D. endothermic
• E. thermostatic

12

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

• A. disintegration
• B. polymerization
• C. cracking
• D. degradation
• E. distillation

13

The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

• A. none of these solutions is acidic
• B. the pH of Y is made more acidic by addition of distilled water
• C. Z is the most acidic solution
• D. W is the most acidic solution
• E. X is neutral

14

When each of the nitrates of Potassium, Magnesium and iron is heated,

• A. all the nitrates decompose to their oxides
• B. the nitrate of magnesium gives the nitrite and oxygen
• C. the nitrates of iron magnesium and iron give the oxides
• D. the nitrate of iron gives the nitrite and oxygen
• E. the nitrate of the magnesium is not decomposed

15

Which of the following metals cannot replace hydrogen from water or steam?

• A. Sodium
• B. Magnesium
• C. Iron
• D. Calcium
• E. Copper

16

A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

• A. boiling the water
• B. adding excess calcium hydroxide
• C. adding a calculated amount of calcium hydroxide
• D. adding sodium carbonate
• E. adding magnesium hydroxide

17

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

• A. the litmus turns blue but no gas is evolved
• B. the litmus turns blue and oxygen is evolved
• C. the litmus turns blue and hydrogen is evolved
• D. the litmus turns red and oxygen is evolved
• E. the litmus turns red and then becomes colourless

18

The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;

• A. saponification
• B. dehydration
• C. esterification
• D. hydrolysis
• E. hydration

19

The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

• A. acetic acid and ethene
• B. methanoic acid and ethene
• C. methanoic acid and ethylene
• D. ethanol and ethene
• E. acetic acid and ethylene

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20

If 30cm³ of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm³ of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?

• A. 9.3 sec
• B. 14 sec
• C. 21 sec
• D. 28 sec
• E. 30.3 sec

21

Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

• A. Tin
• B. Zinc
• C. Copper
• D. Lead
• E. Aluminium

22

Which of the following gases may not be dried with concentrated sulphuric acid?

• A. HCl
• B. N₂
• C. Cl₂
• D. SO₂
• E. NH₃

23

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

• A. CaCO_3(s) CaO_(s) + CO_2(g)
• B. C_(s) + O_2(g) CO_2(g)
• C. 3FeCO_(s) + 2OCO_2(g) FeO_4(s)
• D. SiO_2(s) + CaO_(s) CaCO_3(s)
• E. CO_2(g) + C_(s) 2CO_(g)

24

Which of the following is not a member of the homologous series of the paraffins (alkanes)?

• A. C₃H₈
• B. C₅H₁₂
• C. C₇H₁₆
• D. C₁₅H₃₂
• E. C₂₄H₄₈

25

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

• A. ionic bond
• B. electrovalent bond
• C. covalent bond
• D. co-ordinate bond
• E. hydrogen bond

26

An example of an alcohol is

• A. CCl₄
• B. CH₃COOH
• C. CHCl₃
• D. C₂H₆
• E. CH₃OH

27

The nucleus of an atom contains

• A. protons only
• B. neurons only
• C. protons and electrons
• D. neutrons and electrons
• E. protons and neutrons

28

Hypochlorous acid is used as a bleach because

• A. it is a strong acid
• B. it yields chlorine readily in pure water
• C. it is an oxidising agent
• D. it is a weak acid
• E. it is a reducing agent

29

The normal boiling point of a liquid is defined as

• A. the temperature at which its vapour pressure equals the atmospheric pressure
• B. the temperature at which bubbles begin to form
• C. the temperature at which the vapour pressure equals 1 temperature
• D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
• E. the temperature at which the space above the liquid is saturated

30

Which of the following compounds will form a solution if exposed to air?

• A. Na₂CO₃.10H₂O
• B. NaNO₃
• C. CuSO₄
• D. CaCl₂
• E. Na₂SO₄.10H₂O

31

The most common type of chemical reaction which alkanes undergo is

• A. substitution
• B. addition
• C. condensation
• D. polymerisation
• E. double decomposition

32

Consider the following exothermic reaction
2SO_2(g) + O_2(g) ↔ 2SO_3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

• A. the reaction rate increases
• B. concentration of SO₃ decreases
• C. concentration of SO₃ increases
• D. SO₂ gas becomes unreactive
• E. O₃ gas becomes unreactive

33

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

• A. both zinc and copper are metals
• B. the sulphate radical and the zinc ion are divalent
• C. zinc is more electropositive than copper
• D. both zinc and copper form depositive ions in solution
• E. zinc is a reducing agent

34

Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of

• A. barium chloride solution
• B. dilute hydrochloric acide
• C. lead nitrate solution
• D. calcium chloride solution
• E. sodium hydroxide solution

35

Two gas cylinders contain ethylene (ethene) and acetylene respectively. One test which can be used to distinguish between them is by

• A. passing each gas through bromine water
• B. passing each gas through dilute potassium permanganate solution
• C. passing each gas through silver nitrate solution
• D. treating each gas catalytically with excess hydrogen gas

36

Consider the following equation H2O + 2Fe2+ + Cl2 ↔ 2Fe3+ + 2Cl- + H2O. The only ion which behaves as an oxidising agent is

• A. Fe²⁺
• B. Cl₂
• C. Fe³⁺
• D. Cl^–
• E. H₂O

37

If hydrogen sulphide gas is passed into a solution of a pure iron chloride, a yellow deposit appears. If the deposit is filtered, a pale green solution is left behind. The pale green solution is

• A. dilute sulphuric acid
• B. dilute hydrochloric acid
• C. unreacted hydrogen sulphide in water
• D. iron (III) chloride
• E. Iron (II) chloride

38

Which of the following changes is physical?

• A. Adding iron filing to aerated water
• B. Adding sodium metal to water
• C. Cooling a solution of Iron (II) sulphate to obtain the hydrated salt
• D. Cooling water to obtain ice
• E. Burning the domestic gas (Utilgas) for cooking

39

By means of filtration, one component can be obtained pure from an aqueous mixture of sodium chloride and

• A. potassium nitrate
• B. sand
• C. lead nitrate
• D. sugar (glucose)
• E. starch

40

In titration involving sodium hydroxide and dilute hydrochloric acid, where would you place the base?

• A. in the beaker
• B. in the conical flask
• C. in a burette
• D. in the standard flask
• E. in the measuring cylinder

41

A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because

• A. pressure inside the gas jar is greater than pressure outside it
• B. the air in the gas jar had been used up by burning
• C. oxygen in the gas jar had been used up by burning
• D. nitrogen in the gas jar had been used up by burning
• E. the temperature in the jar had risen considerably

42

You are provided with five gas jars containing SO₂, CO₂, H₂, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely

• A. pass each gas into lime water
• B. pass each gas into water and test with litmus paper
• C. pass each gas into concentrated sulphuric acid
• D. expose each gas to atmospheric air
• E. expose each gas to fumes of hydrogen chloride

43

Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?

• A. Litmus paper
• B. Phenolphthalein
• C. Methyl orange
• D. Universal indicator
• E. None of these

44

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

• A. 2.78g
• B. 5.56g
• C. 8.34g
• D. 11.12g

45

56.00cm³ of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas?
[Molar volume of a gas at S.T.P = 22.4dm³]

• A. 11.00
• B. 22.00
• C. 33.00
• D. 44.00

46

Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]

• A. Propane
• B. Oxygen
• C. Methane
• D. Ammonia

47

Which is the temperature of a given mass of a gas initially at 0°C and 9 atm, if the pressure is reduced to 3 atm at constant volume?

• A. 91K
• B. 182K
• C. 273K
• D. 819K

48

Which of the following will have its mass increased when heated in air?

• A. Helium
• B. Magnesium
• C. Copper pyrites
• D. Glass

49

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
From the equation above, the mass of magnesium required to react with 250cm3 of 0.5M HCl is
[Mg = 24]

• A. 0.3g
• B. 1.5g
• C. 2.4g
• D. 3.0g

50

A gaseous metallic chloride MCl_x consists of 20.22% of M by mass. The formula of the chloride is
[M = 27, Cl = 35.5]

• A. MCl
• B. MCl₂
• C. MCl₃
• D. M₂Cl₆

51

In which of the following are water molecules in the most disorderly arrangement?

• A. Ice at -10°C
• B. Ice at 0°C
• C. Water at 100°C
• D. Steam at 100°C

52

In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol^-1 of energy is required. This energy is referred to as

• A. electron affinity
• B. ionization energy
• C. activation evergy
• D. electronegativity

53

Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains

• A. water vapour
• B. oxygen
• C. carbon (IV) oxide
• D. rare gases

54

The method that can be used to convert hard water to soft water is

• A. chlorination
• B. passage over activated charcoal
• C. the use of an ion-exchange resin
• D. aeration

55

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁷, 4s²
An element with the electronic configuration above is a

• A. non-metal
• B. metal
• C. transition element
• D. group two element

56

Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?

• A. HF_(g)
• B. NH_3(g)
• C. CH_4(g)
• D. HCl_(g)

57

0.25 mole of hydrogen chloride was dissolved in distilled water and the volume made up of 0.50 dm³. If 15.0 cm³ of the solution requires 12.50 cm³ of aqueous sodium trioxocarbonate (IV) for neutralization, calculate the concentration of the alkaline solution

• A. 0.30 mol dm³
• B. 0.40 mol dm³
• C. 0.50 mol dm³
• D. 0.60 mol dm³

58

The correct order of increasing oxidation number of the transition metal ions for the compounds K₂Cr₂O₇, V₂O₅ and KMnO₄ is

• A. V₂O₅ < K₂Cr₂O₇ < KMnO₄
• B. K₂Cr₂O₇ < KMnO₄ < V₂O₅
• C. KMnO₄ < K₂Cr₂O₇ < V₂O₅
• D. KMnO₄ < V₂O₅ < K₂Cr₂O₇

59

The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is

• A. CO, CO² and SO²
• B. CO, HCL and SO²
• C. CO, CO² and HCL
• D. SO², CO² and HCL

60

What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?

• A. A white precipitate is formed
• B. A green precipitate is formed
• C. The mixture remains colourless
• D. The mixture turns reddish brown

That’s the much we can take on the topic “JAMB 2023 Chemistry Questions & Answers 2023, Repeated Questions & Likely 2023 Chemistry Questions”

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