IJMB 2025 CHEMISTRY PAPER II QUESTIONS

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