Your School's Whatsapp Group - Join Us now
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now

Chemistry WAEC 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
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
731
If 5.00cm3 of 0.20 mol dm-3Na2CO3 was diluted with distilled water to obtain 250 cm3 solution, what is the concentration of the resulting solution?
  • A. 0.004 mol dm-3
  • B. 0.02 mol dm-3
  • C. 0.20mol dm-3
  • D. 0.40mol dm-3
View Answer & Discuss (3) WAEC 2008
732
Consider the reaction represented by the following equation: Zn(s) + 2HCI(aq) → ZnCI2(aq) + H2(g) what volume of hydrogen gas is produced at s.t.p. when 3.25 g of zinc reacts with excess dilute HCI? [Zn = 65, Molar gas volume at s.t.p. = 22.4 dm-3]
  • A. 1.12 dm3
  • B. 2.24dm3
  • C. 4.48dm3
  • D. 8.96dm3
View Answer & Discuss (3) WAEC 2008
733
Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35]
  • A. Chlorine
  • B. Hydrogen
  • C. Neon
  • D. Oxygen
View Answer & Discuss (3) WAEC 2008
Post UTME Past Questions Agent
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
734
In a fixed volume of a gas, an increase in temperature results in an increase in pressure due to an increase in the
  • A. number of the collisions between the gas molecules and the walls of the container
  • B. kinetic energy of the gas
  • C. number of collisions between the gas molecules
  • D. number of repulsion between the gas molecules
View Answer & Discuss (4) WAEC 2008
735

When concentrated \(H_2SO_4\) is added to NaCI (s), the gas evolved

  • A. bleaches damp blue litmus paper
  • B. forms a white preciptate with AgNO3(aq)
  • C. forms a white precipitate with BaCI2(aq)
  • D. turns moist red litmus paper blue
View Answer & Discuss (11) WAEC 2008
Start a Free Practice Test
 
Post UTME Past Questions Agent
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
Your School's Whatsapp Group - Join Us now