The IJMB 2025 Chemistry Paper I questions and answers are now accessible for the IJMBE Examination for the 2024/2025 Academic Session.
This platform will provide the 2025 IJMB Chemistry Paper I questions along with the answers and expo resources specifically for the upcoming academic session.
IJMB 2025 Chemistry Paper I Questions and Answers PDF Download
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IJMB 2025 Chemistry Paper I Expo Runz PDF
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IJMB Chemistry Paper I Questions and Answers
The 2024/2025 IJMB Chemistry questions and answers can now be accessed for free below.
Number One
(1)
(a) Neutralisation
(b) Redox
(c) Precipitation
(d) Redox
(e) Precipitation
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Number Two
(2)
(PICK ANY FIVE)
(i) Magnesium hydroxide [Mg(OH)₂]: Used as an antacid and laxative in medicine to neutralize excess stomach acid and relieve constipation.
(ii) Calcium carbonate [CaCO₃]: Used in the manufacture of cement, and as a filler in paper, paint, and plastics industries. It is also used in agriculture to neutralize acidic soils (agricultural lime).
(iii) Barium sulfate [BaSO₄]: Used in medical imaging for X-ray contrast of the digestive tract due to its opacity to X-rays and its non-toxic nature when insoluble.
(iv) Calcium oxide [CaO]: Known as quicklime, it is used in steel making, flue gas treatment, and soil stabilization in construction.
(v) Magnesium sulfate [MgSO₄]: Also known as Epsom salt, used in medicine to treat muscle cramps, in agriculture to correct magnesium-deficient soil, and as a drying agent in organic synthesis.
(vi) Strontium nitrate [Sr(NO₃)₂]: Used in fireworks and signal flares to produce a bright red flame due to strontium ions.
(vii) Calcium chloride [CaCl₂]: Used for de-icing roads, moisture absorption (as a drying agent), and in refrigeration brines.
(viii) Barium chloride [BaCl₂]: Used in laboratory testing to test for sulfate ions in chemical analysis.
(ix) Calcium hydroxide [Ca(OH)₂]: Also known as slaked lime, used in water treatment, wastewater neutralization, and food processing (e.g., in the preparation of corn tortillas).
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Number Three
(3a)
True
(3b)
False
(3c)
True
(3d)
True
(3e)
True
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Number Four
(4)
[Al(H₂O)+]³ ⇔ [Al(H₂O)5(OH)]²+ + H+
=EXPLANATION=
When AlCl₃ dissolves in water, it forms aluminium ions (Al³+). These ions are small and highly charged, so they attract water molecules tightly, forming a hydrated ion: [Al(H₂O)+]³+. The strong positive charge of Al³+ pulls electrons away from the water molecules, weakening the O–H bonds. As a result, one of the water molecules releases a hydrogen ion (H) into the solution. This release of H+ makes the solution acidic. So, the acidity is due to hydrolysis of the hydrated aluminium ion, not the chloride ion.
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Number Five
(5)
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Number Six
(6)
(a) NH₃ – Trigonal pyramidal
(b) NH₄+ – Tetrahedral
(c) BCl₃ – Trigonal planar
(d) CO₂ – Linear
(e) H₂O – Bent (or V-shaped)
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Number Eight
(8)
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Number Nine
(9a)
A = Oxygen (O₂)
B = Calcium oxide (CaO)
(9b)
(i) 2Ca(s) + O₂(g) —> 2CaO(s)
(ii) CaO(s) + H₂O(l) —> Ca(OH)₂(aq)
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Number Ten
(10a)
A battery is a device that converts chemical energy into electrical energy using redox (oxidation-reduction) reactions. It consists of one or more electrochemical cells made up of two electrodes and an electrolyte.
(10b)
At the anode (oxidation):
Zn(s) –> Zn²+(aq) + 2e–
At the cathode (reduction):
Cu²+(aq) + 2e– –> Cu(s)
In an electrochemical cell, a redox reaction occurs where one substance is oxidised and another is reduced, allowing electricity to be generated. For example, in a cell containing zinc and copper, zinc metal at the anode loses two electrons to form Zn²+ ions – this is oxidation. The electrons released by zinc then travel through an external circuit to the copper electrode, where Cu²+ ions in the solution gain those electrons and are reduced to copper metal, which deposits on the cathode. These two half-reactions happen simultaneously. As the electrons flow from zinc to copper, electrical energy is produced. The overall redox reaction for the cell is:
Zn(s) + Cu²+(aq) –> Zn²+(aq) + Cu(s)
This process shows how a redox reaction, with both oxidation and reduction happening together, drives the flow of electrons that we use as electricity.
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Number Twelve
(12)
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Number Fourteen
(14)
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Number Fifteen
(15)
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Number Sixteen
(16)
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COMPLETED.
About IJMB
The Interim Joint Matriculation Board (IJMB) is a direct-entry program that enables students to secure admission into the second year (200 level) at Nigerian universities without the necessity of JAMB. Founded by Ahmadu Bello University, this program has emerged as a reliable alternative for students seeking a seamless pathway into higher education.
Each year, thousands of students enroll in the program and prepare diligently for the final examinations. To excel, many students now utilize the 2025 IJMB questions and answers as part of their study strategy. These resources enhance students’ understanding of potential questions and refine their exam tactics.
Additionally, leveraging the 2025 IJMB questions and answers bestows students with a significant advantage. They can practice in advance, concentrate on essential topics, and effectively manage their time. As the examination approaches, thorough preparation is crucial for securing admission through IJMB.