IJMB 2025 CHEMISTRY PAPER II QUESTIONS
IJMB 2025 CHEMISTRY PAPER II QUESTIONS BELOW
SOLUTIONS BELOW
*IJMB CHEMISTRY II*
*NUMBER THREE*
(3a)
Octane number measures the fuel’s resistance to knocking or pre-ignition in spark ignition engines. A high octane number ensures smoother engine performance and prevents damage.
(3b)
(i) Cracking
(ii) Isomerization
(iii) Addition of antiknock compounds
NUMBER 4
4a
(i)Lightweight and flexible
(ii)Chemically resistant to water and most solvents
(iii)Tough and durable with good tensile strength
4b
(I) Rigid and strong structural integrity
(ii)Weather-resistant and does not corrode
NUMBER 5
(i)Manufacture of plastics (e.g., Bakelite)
(ii) Production of disinfectants and antiseptics
(iii)Synthesis of drugs like aspirin
(iv)Preparation of dyes
(v)Used as a precursor for resins and epoxy coatings
NUMBER 5
(i)Manufacture of plastics (e.g., Bakelite)
(ii) Production of disinfectants and antiseptics
(iii)Synthesis of drugs like aspirin
(iv)Preparation of dyes
(v)Used as a precursor for resins and epoxy coatings
NUMBER 6
6a)Natural diol: Ethylene glycol
Natural triol: Glycerol (propane-1,2,3-triol)
Aromatic alcohol: Phenol
6b
Amylase – breaks down starch into sugars
Zymase – converts sugars into ethanol and CO₂
IJMB E CHEMISTRY PAPER II
NUMBER 7
Aldehydes
Ketones
Carboxylic acids
Esters
Amides
