[ Post UTME Begins ]: View The List Of Schools That Have Released 2026 Post-UTME Forms.
Post UTME Past Questions Agent
Your School's Whatsapp Group - Join Us now
  1. Home
  2. Classroom
  3. Chemistry
  4. WAEC 2005

Chemistry 2005 WAEC Past Questions

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

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
Your School's Whatsapp Group - Join Us now
1
The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X
  • A. Belongs to group 6 of the Periodic Table
  • B. Belongs to group IV of the Periodic Table
  • C. has 3 unpaired electrons in its atom
  • D. has relative molecular mass of 16
View Answer & Discuss (5) WAEC 2005
2
What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons?
  • A. 15
  • B. 30
  • C. 35
  • D. 50
View Answer & Discuss (1) WAEC 2005
3

Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table?

  • A. 6C, 4Be, 7N,8 O
  • B. 4Be,6 C,7 N,8 O
  • C. 8O, 7 N, 6C, 4Be
  • D. 7N, 8O, 6C,4Be
View Answer & Discuss (7) WAEC 2005
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 Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
4
Which of the following changes is characteristic of an alpha-particle emission?
  • A. the nucleus loses two protons and two neutrons
  • B. a proton combines with an electron giving off heat
  • C. the nucleus splits into two equal parts
  • D. four neutrons are lost
View Answer & Discuss WAEC 2005
5
An element X has an atomic number of 16. What is its most likely oxidation state in its binary compounds?
  • A. -3
  • B. -2
  • C. +2
  • D. +4
View Answer & Discuss (4) WAEC 2005
Start a Free Practice Test
 
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
Your School's Whatsapp Group - Join Us now
Post UTME Past Questions Agent