Your School's Whatsapp Group - Join Us now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

Chemistry Past Questions

Clear Selections
Change Subject Post a Question Check Syllabus Study My Bookmarks Past Questions Videos Watch Video Lessons Download App

Your School's Whatsapp Group - Join Us now
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
666
In the reaction 1O-3 + 5l- + 6H+ → 312 + 3H2O, the oxidizing agent is?
  • A. H+
  • B. l-
  • C. 1O-
  • D. l2
View Answer & Discuss (11) JAMB 1990
667

Fe\(_2\)O\(_{3(s)}\) + 2Al\(_{(s)}\) → Al\(_2\)O\(_3\) + 2Fe\(_{(s)}\). If the heats of formation of Al\(_2\)O\(_3\) and Fe\(_2\)O\(_3\) are - 1670 kJmol\(^{-1}\) and - 822 kJmol\(^{-1}\) respectively, the enthalpy change in kJ for the reaction is ?

  • A. +2492
  • B. +848
  • C. -848
  • D. -2492
View Answer & Discuss (10) JAMB 1990
668

Iron galvanized with zinc is cathodically protected from corrosion. This is because?

  • A. zinc has a more positive oxidation potential than iron
  • B. zinc has less positive oxidation potential than iron
  • C. bith have the same oxidation potential
  • D. zinc is harder than iron
View Answer & Discuss (11) JAMB 1990
Post UTME Past Questions Agent
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
669
Which of the following samples will react fastest with dilute trioxonitrate (V) acid?
  • A. 5 g of lumps of CacO3 at 25°C
  • B. 5 g of powered CacO3 at 25°
  • C. 5 g of lumps of CaCO3 at 50°C
  • D. 5 g of powered CaCO3 AT 50°C
View Answer & Discuss (3) JAMB 1990
670
In the reaction:
2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;

The concentration of iodine in the equilibrium mixture can be increased by?
  • A. raising the pressure
  • B. raising the temperature
  • C. adding a catalyst
  • D. lowering the pressure
View Answer & Discuss (9) JAMB 1990
Start a Free Practice Test
 
Your School's Whatsapp Group - Join Us now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now