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 1990 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 Agent
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
26
Which of the following explains why trioxonitrate (V) acid is not used for preparing hydrogen from metals?
  • A. it is volatile
  • B. it is strongly oxidizing
  • C. it forms a layer of oxide on the metal
  • D. trioxonitrate (V) salts are soluble in water
  • E. it renders the metals passive
View Answer & Discuss (1) WAEC 1990
27
Which of the following is normally used for drying ammonia gas?
  • A. Concentrated tetraoxonitrate (Vl) acid
  • B. Calcium oxide
  • C. anhydrous calcium chloride
  • D. phosphorus (V) oxide
  • E. anhydrous copper (ll) tetraoxosulphate (VI)
View Answer & Discuss WAEC 1990
28
Nuclear reactions can be used in the following except
  • A. gauging the thickness of objects
  • B. making atomic bombs
  • C. curing cancer
  • D. generating electricity
  • E. purifying water
View Answer & Discuss (1) WAEC 1990
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
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
29
The decomposition of hydrogen peroxide is represented by the equation: 2H2O(l) + O2(g) what mass of hydrogen peroxide would be required to produce 22.4dm3 of oxygen at s.t.p? (H = 1, O = 16, molar volume of a gas at s.t.p. = 22.4dm3)
  • A. 18 g
  • B. 34 g
  • C. 36 g
  • D. 64 g
  • E. 68 g
View Answer & Discuss (7) WAEC 1990
30
Which of the following compounds crystallizes without water of crystallization?
  • A. Na2CO3
  • B. CuSO4
  • C. MgSO4
  • D. NaCI
  • E. FeSO4
View Answer & Discuss WAEC 1990
Start a Free Practice Test
 
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 127076
Post UTME Past Questions Agent