JAMB 2020 Chemistry Past Questions & Answers Online Practice

JAMB 2020 Chemistry Past Questions & Answers Online Practice

Try out this JAMB 2020 Chemistry Past Questions & Answers Online Practice if you are a Science Student and planning to write UTME this year.

NOTE: In this Chemistry Past Question & Answers Quiz;

raised to power will be denoted as ^ (i.e 4 raised to power 2 is written as 4^2).

subscript will be denoted to ~ (i.e 4 subscript 2 is written as 4 ~ 2).

Do you understand? Now start…

1 The electronic configuration of an element is 1S^2 2S^2 2P^6 3S^2 3P^3. How many unpaired electrons are there in the element?
1. 5
2. 4
3. 3
4. 2
Correct!

Wrong!
2 Which of the following can be obtained by fractional distillation?
1. Nitrogen from liquid air
2. Sodium Chloride from sea water
3. Iodine from solution of Iodine in carbon tetrachloride
4. Sulphur from the solution of sulphur in carbon disulphide
Correct!

Wrong!
3 Duralumin consists of aluminum, copper, ________________?
1. Zinc and Gold
2. Lead and Manganese
3. Nickel and Silver
4. Manganese and Magnesium
Correct!

Wrong!
4 An example of a polysaccharide is?
1. Dextrose
2. Mannose
3. Glucose
4. Starch
Correct!

Wrong!
5 8g of CH~4 occupies 11.2 at S.T.P. What volume would 22g of CH~3CH~2CH~3 occupy under the same condition?
1. 3.7dm^3
2. 11.2dm^3
3. 22.4dm^3
4. 33dm^3
Correct!

Wrong!
6 The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?
1. with cool running water
2. sodium hydroxide solution
3. iodine solution
4. sodium trioxonitrate(v) solution
Correct!

Wrong!
7 Which of the gas laws does this graph illustrate?
1. Boyle
2. Charles
3. Gay-Lussac
4. Graham
Correct!

Wrong!
8 What are the possible oxidation numbers of an element if its atomic number is 17?
1. -1 and 7
2. -1 and 6
3. -3 and 5
4. -2 and 6
Correct!

Wrong!
9 What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?
1. Steam distillation
2. Destructive distillation
3. Liquefication
4. Hydrolysis
Correct!

Wrong!
10 Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the ?
1. Acid
2. Ester of alkanoic acid
3. Alkali
4. Alkanol
Correct!

Wrong!
11 When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?
1. Oxyethene
2. Oxyhydrocarbon flame
3. Oxyacetylene flame
4. Oxymethane flame
Correct!

Wrong!
12 Which of the following substances is a mixture?
1. Granulated sugar
2. Seawater
3. Sodium chloride
4. Iron filling
Correct!

Wrong!
13 If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?
1. 1.650atm
2. 0.825atm
3. 0.413atm
4. 0.275atm
Correct!

Wrong!
14 Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?
1. P
2. Q
3. R
4. S
Correct!

Wrong!
15 The products of the thermal decomposition of ammonium trioxonitrate(v) are?
1. Nitrogen (I) Oxide and Water
2. Ammonia and Oxide
3. Nitrogen and Water
4. Nitrogen (IV) Oxide and Water
Correct!

Wrong!
16 How many valence electrons are contained in the element (31/15)P ?
1. 3
2. 4
3. 15
4. 31
Correct!

Wrong!
17 The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO~3 is treated with 0.2dm^3 of 1 Mole of HCL in the equation: CaCO~3 + 2HCL ⇒ CaCl~2 + H~2 O + CO~2 , is ?
1. 1.00 X 10^23
2. 6.02 X 10^23
3. 6.02 X 10^22
4. 6.02 X 10^24
Correct!

Wrong!
18 The volume occupied by 1.58g of a gas at S.T.P is 500cm^3 . What is the relative molecular mass of the gas? [ G.M.V at S.T.P = 22.4dm^23 ]
1. 28
2. 32
3. 44
4. 74
Correct!

Wrong!
19 Which of the following gases will rekindle a brightly splint?
1. NO~2
2. NO
3. N~2O
4. CL~2
Correct!

Wrong!
20 The shape of ammonia molecule is?
1. Trigonal planar
2. Octahedral
3. Square planar
4. Tetrahedral
Correct!

Wrong!
21 A few drop of conc HCL are added to about 10cm^3 of a solution of PH 3.4. The PH of the resulting mixture is?
1. less than 3.4
2. greater than 3.4
3. unaltered
4. the same as that of the pure water
Correct!

Wrong!
22 Chromatography is used to separate components of mixture which differ in their rates of ?
1. diffusion
2. migration
3. reaction
4. sedimentation
Correct!

Wrong!
23 Deliquescent substances are also?
1. efflorescent
2. anhydrous
3. hygroscopic
4. insoluble
Correct!

Wrong!
24 Helium is used in observation of ballons because it is?
1. Light and combustible
2. light and non-combustible
3. heavy and combustible
4. heavy and non-combustible
Correct!

Wrong!
25 32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm^3 of water generated 13.0kj of heat. The heat solution is?
1. 26.0kj/mol
2. 65.0kj/mol
3. 130.0kj/mol
4. 260.0kj/mol
Correct!

Wrong!
26 A gaseous metallic chloride MCl consists of 20.22% of M by mass. The formula of the chloride is? [ M = 27, Cl = 35.5]
1. MCl
2. MCl~2
3. MCl~3
4. M~2Cl~6
Correct!

Wrong!
27 What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
1. 24,125 C
2. 48,250 C
3. 72,375 C
4. 96,500 C
Correct!

Wrong!
28 Which of the following types of bonding does not involve the formation of new substances?
1. Metallic
2. Covalent
3. Co-ordinate
4. Electrovalent
Correct!

Wrong!
29 An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?
1. Alkene
2. Alkanal
3. Alkanone
4. Alkanoic Acid
Correct!

Wrong!
30 The substance often used for vulcanization of rubber is?
1. Chlorine
2. Hydrogen peroxide
3. Sulphur
4. Tetraoxosulphate(vi) acid
Correct!

Wrong!
31 The chlorinated alkane often used industrially to remove grease is?
1. Tetrachloromethane
2. Chloromethane
3. Trichloromethane
4. Dichloromethane
Correct!

Wrong!
32 What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
1. 8.0g
2. 16.0g
3. 36.0g
4. 72.0g
Correct!

Wrong!
33 Proteins in acid solution undergo?
1. Substitution
2. Fermentation
3. Hydrolysis
4. Polymerisation
Correct!

Wrong!
34 The general formula for the Alkanals is?
1. R^2CO
2. RCHO
3. ROH
4. RCOOR
Correct!

Wrong!
35 When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?
1. Bipolar
2. Negatively charged
3. Positively charged
4. Neutral
Correct!

Wrong!
36 When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
1. Sublimation
2. Crystallization
3. Distillation
4. Evaporation
Correct!

Wrong!
37 An electron can be added to a halogen atom to form a halide ion with?
1. 8 valence electrons
2. 7 valence electrons
3. 2 valence electrons
4. 3 valence electrons
Correct!

Wrong!
38 Aluminum hydroxide is used in the dyeing industry as a?
1. Dye
2. Salt
3. Dispersant
4. Mordant
Correct!

Wrong!
39 The most important element on the earth's crust is?
1. Nitrogen
2. Hydrogen
3. Fluorine
4. Oxygen
Correct!

Wrong!
40 To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
1. Passed over heated copper(ii)oxide
2. Bubbled through water
3. Bubbled through conc H~2SO~4
4. Bubbled through conc NAOH
Correct!

Wrong!

JAMB 2020 Chemistry Past Questions & Answers Online Practice

Created on 07 Feb 2022

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JAMB 2020 Chemistry Past Questions & Answers Online Practice

1 The electronic configuration of an element is 1S^2 2S^2 2P^6 3S^2 3P^3. How many unpaired electrons are there in the element?

2 Which of the following can be obtained by fractional distillation?

3 Duralumin consists of aluminum, copper, ________________?

4 An example of a polysaccharide is?

5 8g of CH~4 occupies 11.2 at S.T.P. What volume would 22g of CH~3CH~2CH~3 occupy under the same condition?

6 The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?

7 Which of the gas laws does this graph illustrate?

8 What are the possible oxidation numbers of an element if its atomic number is 17?

9 What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?

10 Liquid black soap is made by boiling palm oil with liquid extract of ash. The function of the ash is to provide the ?

11 When water drops are added to calcium carbide in a container and the gas produced is passed through a jet and lighted, the resultant flame is called an?

12 Which of the following substances is a mixture?

13 If the quantity of oxygen occupying 2.76L container at a pressure of 0.825 atm and 300k is reduced by one-half, what is the pressure exerted by the remaining gas?

14 Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?

15 The products of the thermal decomposition of ammonium trioxonitrate(v) are?

16 How many valence electrons are contained in the element (31/15)P ?

17 The number of molecules of Carbon(iv)Oxide produced when 10.0g of CaCO~3 is treated with 0.2dm^3 of 1 Mole of HCL in the equation: CaCO~3 + 2HCL ⇒ CaCl~2 + H~2 O + CO~2 , is ?

18 The volume occupied by 1.58g of a gas at S.T.P is 500cm^3 . What is the relative molecular mass of the gas? [ G.M.V at S.T.P = 22.4dm^23 ]

19 Which of the following gases will rekindle a brightly splint?

20 The shape of ammonia molecule is?

21 A few drop of conc HCL are added to about 10cm^3 of a solution of PH 3.4. The PH of the resulting mixture is?

22 Chromatography is used to separate components of mixture which differ in their rates of ?

23 Deliquescent substances are also?

24 Helium is used in observation of ballons because it is?

25 32g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm^3 of water generated 13.0kj of heat. The heat solution is?

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

27 What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?

28 Which of the following types of bonding does not involve the formation of new substances?

29 An organic compound that does not undergo a reaction with both hydrogen cyanide and hydroxylamine can be?

30 The substance often used for vulcanization of rubber is?

31 The chlorinated alkane often used industrially to remove grease is?

32 What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?

33 Proteins in acid solution undergo?

34 The general formula for the Alkanals is?

35 When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?

36 When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?

37 An electron can be added to a halogen atom to form a halide ion with?

38 Aluminum hydroxide is used in the dyeing industry as a?

39 The most important element on the earth's crust is?

40 To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?

JAMB 2020 Chemistry Past Questions & Answers Online Practice

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