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1751
Which of the following equations represents the reaction leading to the removal of permanent hardness of water?
  • A. Ca(HCO 3)2 → CaCO3 + H2O + CO2
  • B. MgSO4 + Na 2CO3 + Na 2SO
  • C. Ca(OH) 2 + 2HCI → CaCI 2 + 2H 2O
  • D. Ca(HCO3)2 + Ca(OH)3 → 2CaCO3 + 2H2O
  • E. MgSO4 + BaCI2 → MgCI2 + BaSO4
View Answer & Discuss (5) WAEC 1990
1752
The following alloys contain copper except
  • A. magnalium
  • B. duralumn
  • C. bronze
  • D. brass
  • E. type metal
View Answer & Discuss (8) WAEC 1990
1753

How many mole of AgNO\(_3\) are there in 500cm\(^3\) of 0.01M AgNO\(_3\) solution?

  • A. 0.005 mole
  • B. 0.05 mole
  • C. 0.5 mole
  • D. 5 moles
  • E. 1 mole
View Answer & Discuss (12) WAEC 1990
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1754
Which of the following statements explains why tetraoxosulphate (IV) acid is reqarded as a strong acid?
  • A. Tetraoxosulphate (IV) acid is dibasic
  • B. the acid is concentrated
  • C. the acid is complately ionized in aqueous solution
  • D. tetraxosulphate (IV) ions are very reactive
  • E. the acid is highly corrosive
View Answer & Discuss (3) WAEC 1990
1755

Which of the following is not correct of glucose and fructose?They

  • A. are structural isomers
  • B. reduce fehling's solution
  • C. can be obtained by the hydrolysis of starch
  • D. are readily fermented by enzymes
  • E. are soluble in water
View Answer & Discuss (11) WAEC 1990
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