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3211
If 100cm3 of oxygen pass through a porous plug is 50 seconds, the time taken for the same volume of hydrogen to pass through the same porous plug is? [O = 16, H = 1]
  • A. 10.0s
  • B. 12.5s
  • C. 17.7s
  • D. 32.0s
View Answer & Discuss (4) JAMB 2017
3212
Due to the high reactivity of sodium, it is usually stored under
  • A. water
  • B. mercury
  • C. paraffin
  • D. phenol
View Answer & Discuss JAMB 2017
3213
The furring of kettles is caused by the presence in water of
  • A. calcium hydrogentrioxocarbonate (IV)
  • B. calcium trioxocarbonate (IV)
  • C. calcium tetraoxosulphate (VI)
  • D. calcium hydroxide
View Answer & Discuss (20) JAMB 2017
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
3214
Water for town supply is chlorinate to make it free from
  • A. bad colour
  • B. bacteria
  • C. temporary hardness
  • D. permanent hardness
View Answer & Discuss (1) JAMB 2017
3215

Ca(OH)2(s) + 2NH4Cl(s) → CaCl2(s) + 2H2O(l) + X. In the reaction above X is

  • A. NO2
  • B. NH3
  • C. N2O
  • D. NO2
View Answer & Discuss (2) JAMB 2017
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Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
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 - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free