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

Chemistry 1992 WAEC Past Questions

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

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
Your School's Whatsapp Group - Join Us now
36
A dye is suspected to have contaminated a lollipop. Which of the following is the best method by which the contaminant may be isolated?
  • A. Fractional distillational
  • B. Recrystallization
  • C. Filtration
  • D. Paper chromatography
  • E. Evaporation
View Answer & Discuss WAEC 1992
37
Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?
  • A. Electrons are present in metals but not in salt solutions
  • B. Metals are conductors while salts are electrolytes
  • C. Electricity is carried by mobile elrctrons in metals but by ions is aqueous salt solution
  • D. salts ionize in aqueous solutions while metals do not
  • E. Metals are reducing agents while salts are not
View Answer & Discuss (3) WAEC 1992
38

(a) State the method of collecting gases which are denser than air.

(b) Name two gases that can be used to perform the fountain experiment in the laboratory. State the physical property which makes it suitable for the experiment.

View Answer & Discuss WAEC 1992
Post UTME Past Questions Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Your School's Whatsapp Group - Join Us now
39

(a) State the main ore of tin.

(b) Write an equation for the reaction involved in the smelting of purified tin ore

(c) List two alloys of tin

View Answer & Discuss WAEC 1992
40

(a) Name the crystalline allotrope of sulphur that is stable at room temperature.

(b)(i) Give one example of a fuel that contains significant amount of sulphur as an impurity.

(ii) State one environmental disadvantage of using a fuel that has high sulphur content

View Answer & Discuss WAEC 1992
Start a Free Practice Test
 
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 Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts