JAMB CHEMISTRY 2022 LIKELY QUESTION

JAMB CHEMISTRY 2022 LIKELY QUESTION

1. The I.U.P.A.C name for the compound
Cl
|
CH3 ——C ——CH2 –CH3
|
C
a. 2- chloro – FCCisotopentane
b. 3 – chloro – isopentane
c. 1 – chloro -2,2 -di methyl propane.
d. 2 – chloro – 2 – ethylpropane

Answer C

2. At S.T.P how many liters of hydrogen would be obtained from the reaction of 500cm³ of 0.5M H²SO4 with excess zinc metal?
a. 22.4dm³ b. 11.2dm³ c.6.5dm³ d.0.025dm³

Answer D:
Zn + H²SO4 —> ZnSO4 + H2

No. Of moles in 500cm³ = 0.5 × 500 / 1000
= 0.025 moles

3. What reaction takes place when palm oil is added to potash and foams are observed?
a. Neutralization b. Saponification
c. Esterification d. Salting out

Answers: Saponification (B)

4.Starch can be converted to ethyl alcohol by
A. distillation
B. fermentation ✔️
C. isomerization
D. cracking
E. cooking

5.When excess ethanol is heated to 145°c in the presence of concentrated sulphuric acid, the product is
A. diethyl ether ✔️
B. ethyne
C. diethyl sulphate
D. acetone
E. ethanoic acid

6. 0.1 Faraday of electricity was passed through a solution of copper (II) sulphate. The maximum weight of copper deposited on the cathode would be ? ( Cu = 64)
A. 64.0g
B. 32.0g
C. 16.0g
D. 6.4g
E. 3.2g ✔️

*SOLUTION*

CUSO4 —–> CU²+ SO²-4
CU²+ + 2e ——> CU
1 Faraday will deposit 64/2 grams of copper
0.1 Faraday will deposit
= 64/2 × 1/10
= 3.2grams

7.When heat is absorbed during a chemical reaction, the reaction is said to be
A. thermodynamic
B. exothermic
C. isothermal
D. endothermic ✔️
E. thermostatic

8. Two metallic ions associated with hard water are
A. Copper and Zinc
B. Magnesium and Silver
C. Calcium and Magnesium ✔️
D. Potassium and tin
E. Sodium and Lead

See also  Jamb Government Past question and answers PDF Download

9.Which of the following raw materials would be required for the smelting of iron ore in a blast furnace ?
A. CaCO3 ✔️
B. Zn(NO³)²
C. CuSO4
D. AlCl3
E. CaSO4

10.Which of the following does not contain aluminum as a compound ?
A. Over head cables
B. Duralumin
C. Container for caustic soda
D. Container for nitric soda ✔️

11.The approximate volume of air containing 10cm³ of oxygen is ?
A. 20cm³
B. 25cm³
C. 50cm³ ✔️
D. 100cm³
E. 10cm³
SOLUTION : 1 volume of oxygen = 2 × 10
Volume of air = 100 × 10
100 × 10 / 20 = 50 cm³

12.Which of the following sulphides is insoluble In dilute Hcl?
A. Na²S
B. ZnS
C. CuS. ✔️
D. FeS
E. PbS
_WhatsApp Official Sypron 07061417103 for your EXAM RUNZ_
13.The characteristic reaction of carbonyl compounds is
A. Substitution
B. Elimination
C. Addition ✔️
D. Saponification
E. Fermentation

14.An example of polysaccharide is
A. -dextrose
B. Maltose
C. Glucose
D. Starch ✔️
E. Fructose

15.The shape of ammonia molecule is
A. Trigonal planar ✔️
B. Octahedral
C. Square planar
D. Tetrahedral

16.What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen ? [H=1 , O = 16 ]
A. 36.0g
B. 8.0g
C. 72.0g ✔️
D. 16.0g
E. 18.0g

*SOLUTION*

2H² + O² ——-> 2H²O
From the equation
4g of Hydrogen produces 36g of water
8g of Hydrogen will produce Xg of water ( H20 )
>> 4g = 36g
8g = Xg. ( Cross multiply )
36 × 8 / 4.
= 72g of H²O

17. What volume of oxygen is produced from the decomposition of 2moles of KClO3 at S.T.P ?
A. 22.4dm³
B. 33.6dm³
C. 44.8dm³
D. 67.2dm³ ✔️
E. 77.8dm³

See also  How to apply for the JAMB 2022 UTME

*SOLUTION*

1 MOLES OF OXYGEN OCCUPIED 22.4dm³

3MOLES OF OXYGEN OCCUPIED ( 3 × 22.4 )

= 67.2 DM

18.A carcinogenic substance is
A. Asbestos dust ✔️
B. Saw dust
C. Nitrogen (II) oxide
D. Carbon (II) oxide
E. Colloid

19. The electronic configuration of an element is 1s²2s²2p63p²3p³ . How many unpaired electrons are there in the element ?
A. 5
B. 4
C. 3 ✔️
D. 2

20. Which of the following is arranged in order of increasing electronegativity ?
A. Chlorine , aluminum , magnesium , phosphorus , sodium
B. Sodium , magnesium, aluminum, phosphorus , chlorine ✔️
C. Chlorine, phosphorus , aluminum , magnesium , sodium
D. Sodium , chlorine , phosphorus , magnesium , aluminum
_WhatsApp Official Sypron 07061417103 for your EXAM RUNZ_
21.How many grams of bromine will be required to completely react with 10g of propyne ?[ C = 12 , H = 1 , Br =80]
A. 20g
B. 40g
C. 60g
D. 80g ✔️

*SOLUTION*

C³H⁴ + 2Br² ——> CHBr²CBr²CH³

Propyne + Bromine
Propyne = 12×3 + 1×4
= 36+4 = 40g of propyne ( C³H⁴ )
Bromine = 2 [ 80 × 2 ]
= 2 [160 ]
= 320g of Bromine ( 2Br² )

.°. 40g of propyne reacts with 320g of Bromine
10g of propyne reacts with = 10×320 / 40
= 80g (D)

22.The characteristics reaction of carbonyl compounds is
A. Substitution
B. Elimination
C. Addition ✔️
D. Saponification

23.An example of polysaccharide is
A. -dextrose
B. Mannose
C. Glucose
D. Starch ✔️

24.Water has a rather high boiling point despite its low molecular mass because of the presence of
A. Hydrogen bonding✔️
B. Covalent bonding
C. Ionic bonding
D. Metallic bond

25.Which of the following compounds is a base ?
A. Co²
B. CaO ✔️
C. H³PO³
D. CH³COOCH³

See also  JAMB 2022 ENGLISH QUESTIONS

26.. A solid that absorbs water from the atmosphere and forms an aqueous solution is
A. Hydrophilic
B. Efflorescent
C. Deliquescent ✔️
D. Hydroscopic

27.The most abundant element on the earths crust is
A. Nitrogen
B. Hydrogen
C. Oxygen ✔️
D. Fluorine

28.. The most suitable metal that can be used as lightning conductor is
A. Silver
B. Copper ✔️
C. Iron
D. Aluminum

29. Metalliods are also referred to as
A. Semi metal ✔️
B. Metals
C. Colloids
D. Non – metals
_WhatsApp Official Sypron 07061417103 for your EXAM RUNZ_
30.Zinc and carbon rods are used as anode and cathode respectively in a
A. Leclanche cell ✔️
B. Lead accumulator
C. Daniel cell
D. Voltaic cell

31.The basicity of CH³COOH is
A. 1 ✔️
B. 2
C. 3
D. 4

32.Coffee stains can be removed by
A. Kerosene
B. Turpentine
C. A solution of borax in water
D. Ammonia solution ✔️

33.Which of the following is used as fuel in miners lamp ?
A. Ethanal
B. Ethyne ✔️
C. Ethene
D. Ethane

34.Which of the following is used to hasten the ripening of fruits ?
A. Ethene ✔️
B. Ethanol
C. Ethyne
D. Ethane

35.The ability of carbon to form long chains is referred to as
A. Alkylation
B. Acylation
C. Catenation ✔️
D. Carbonation

Leave a Reply

error: Content is protected !!