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DAY 3 CHEMISTRY JAMB QUESTIONS



Electrolysis

1. During electrolysis, oxidation occurs at the:
A) Anode
B) Cathode
C) Electrolyte
D) Salt bridge

Answer: A) Anode

2. The electrolyte used in the electrolysis of brine is:
A) Sodium chloride solution
B) Copper(II) sulfate solution
C) Distilled water
D) Lead(II) nitrate solution

Answer: A) Sodium chloride solution



3. Which of the following gases is liberated at the anode during the electrolysis of brine?
A) Hydrogen
B) Oxygen
C) Chlorine
D) Nitrogen

Answer: C) Chlorine

Organic Chemistry (about 40%)

4. Alkanes are generally known as:
A) Saturated hydrocarbons
B) Unsaturated hydrocarbons
C) Aromatic compounds
D) Alcohols

Answer: A) Saturated hydrocarbons

5. The general formula of alkanes is:
A) C_nH_{2n}
B) C_nH_{2n+2}
C) C_nH_{2n-2}
D) C_nH_n

Answer: B) C_nH_{2n+2}

6. Ethene is an example of a/an:
A) Alkane
B) Alkene
C) Alkyne
D) Alcohol

Answer: B) Alkene

7. Which of the following is used in the industrial preparation of ethanol?
A) Fermentation of sugars
B) Electrolysis of water
C) Burning of hydrocarbons
D) Reaction of acids

Answer: A) Fermentation of sugars


8. Which of the following is an alkyne?
A) Methane
B) Ethene
C) Ethyne
D) Ethanol

Answer: C) Ethyne

9. The functional group of alcohols is:
A) –COOH
B) –OH
C) –CHO
D) –C≡C–

Answer: B) –OH

10. Which of the following compounds is an aromatic hydrocarbon?
A) Ethene
B) Benzene
C) Ethyne
D) Methane

Answer: B) Benzene

11. Boyle’s law states that at constant temperature, the pressure of a gas is:
A) Directly proportional to volume
B) Inversely proportional to volume
C) Directly proportional to temperature
D) Constant

Answer: B) Inversely proportional to volume

12. Charles’ Law states that:
A) Pressure is constant when volume changes
B) Volume is directly proportional to absolute temperature
C) Volume is inversely proportional to temperature
D) Temperature is inversely proportional to pressure

Answer: B) Volume is directly proportional to absolute temperature

13. Avogadro’s law states that equal volumes of gases under the same conditions contain:
A) Equal masses
B) Equal number of molecules
C) Equal densities
D) Equal pressure

Answer: B) Equal number of molecules

14. The electronic configuration of sodium is:
A) 2, 8, 8
B) 2, 8, 1
C) 2, 1, 8
D) 8, 8, 2

Answer: B) 2, 8, 1

15. How many electrons are in the outermost shell of an oxygen atom?
A) 2
B) 4
C) 6
D) 8

Answer: C) 6

Preparation of Compounds

16. Oxygen gas can be prepared in the laboratory by heating:
A) Sodium chloride
B) Potassium trioxochlorate(V)
C) Calcium carbonate
D) Ammonium chloride

Answer: B) Potassium trioxochlorate(V)



17. Hydrogen gas can be prepared by the action of dilute HCl on:
A) Copper
B) Sodium
C) Zinc
D) Carbon

Answer: C) Zinc


Half-Life

18. The half-life of a radioactive element is 2 hours. How much of a 20g sample remains after 6 hours?
A) 10g
B) 5g
C) 2.5g
D) 1.25g

Answer: C) 2.5g
(Solution: After each 2 hours → half. 20g → 10g → 5g → 2.5g)


19. The time required for half the nuclei of a radioactive sample to decay is called:
A) Decay time
B) Rate of decay
C) Half-life
D) Reaction time

Answer: C) Half-life


20. If a substance has a half-life of 3 minutes, how much of a 16g sample will remain after 9 minutes?
A) 8g
B) 4g
C) 2g
D) 1g

Answer: D) 2g
(Solution: 16g → 8g → 4g → 2g

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Jamb LITERATURE IN ENGLISH TODAY

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TOPICS ASKED MOST IN THE 2025 JAMB DAY 1 AND DAY 2 COMPILED (APRIL 24TH AND 25TH, 2025)‼️🔥
These are the topics that were most recurring in the just concluded DAY 1 and DAY 2 JAMB EXAM 2025. Take note of them as they have a very high probability of coming out for the other days📌
These topics have the highest likelihood of coming out in other days of the EXAM. Forward to others so they can also prepare with the right topics⤵️⤵️⤵️⤵️⤵️⤵️

BIOLOGY:
📌Transport
📌Support and movement
📌Living organisms
📌Adaptation
📌Heredity
📌Biomes
📌Ecology
📌Genetics...
📌Nutrition
📌Respiration
📌Evolution

PHYSICS:
📌 Metals and their components
📌Lens & Refraction
📌Motion
📌Radioactivity
📌Thermal conductivity
📌Work, Energy and Power:
📌 Heat Energy
📌Electrical Energy and Current Electricity
📌Equilibrium of Forces
📌Elastic Properties of Solid
📌Vector
📌Newton's Laws of Motion
📌Equilibrium of Forces
📌Forces
📌Simple Harmonic Motion and Waves
📌Machines

CRS:
📌Disobedience and it's consequences.
📌Second Epistles
📌Religious Reforms in judah
📌All the Paul's letters to the church
📌Supremacy of God
📌Decision making
Make sure to note their biblical references too. RSV to be precise📌

CHEMISTRY:
📌Metals and their compounds
📌Acid-base chemistry
📌Atomic structure
📌 Chemical bonding
📌 Environmental chemistry
📌Hydrocarbons
📌Chemical reactions
📌Properties of matter
📌Chemical processes
📌Chemical reactions and equations
📌Properties of elements and compounds
📌Environmental chemistry and pollution
📌 Hydrocarbon chemistry
📌Chemical bonding and structure
📌Goan read anything Mole and molar mass o
📌Iupac nomenclature and Naming of compound
📌Lots of Organic chemistry






Commerce:
📌Stock exchange
📌Insurance
📌Legal aspect of business
📌Commercial bodies in Nigeria
📌Aids to trade
📌production
📌International organisation
📌Trade
📌Advertisement
📌Transportation




Economics:
📌Demand and supply
📌Market structure
📌Tax system
📌Unemployment
📌Basic tools in economic analysis
📌Basic economic terms in economics
📌Equilibrium point and position

Literature:
ALL LITERATURE TEXTS;
📌Unexpected joy at dawn.
📌Look back in anger.
📌Second class citizens.
📌Lion and the jewel.
📌Midsummer night's dream.
📌Wuthering heights
Literature poems, drama, prose, literary appreciation.

Mathematics:
📌Calculus
📌Surds
📌Indices and logarithm
📌Trigonometry
📌Bearing and distance
📌Simplifying of Complex problems
📌A lot of word problems

Government:
📌ECOWAS,OAU,AU and other government agencies and communities
📌Government military rule
📌 international organisations
📌basic concepts in government
party system, and political party.
📌Constitutional development
📌 colonialization and decolonization.

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WAEC 2025 MIDNIGHT QUESTION AND ANSWER  PAYMENTS!!!.

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Waec 2pm tomorrow

Store management obj & theory

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Waec Store management!!!

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WAEC 2025 MIDNIGHT QUESTION AND ANSWER  PAYMENTS!!!.

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MATHEMATICS TOPIC TO READ FOR TOMORROW'S EXAMS 28/2025

-Bar Chart
- Median
-Matrix
-Circle theorem
-Trigonometric ratio
-Ap and GP
-Combination & permutation
-Probability
-Mean and Range


PHYSICS:
-Gas law
-Resistance
-Capacitance
-Relative humidity
-Relative density
-Micrometer
-Measurement
-Angular velocity
-Frequency
-Force

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