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Chemistry Past Questions

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2796

The oxidation state of sulphur on H2SO4 acid is

  • A. -4
  • B. +6
  • C. 4
  • D. -8
View Answer & Discuss (1) JAMB 2015
2797
In the electrolysis of brine the anode is
  • A. platinum
  • B. copper
  • C. zinc
  • D. carbon
View Answer & Discuss (3) JAMB 2015
2798
Calculate the relative molecular mass of Limestone CaCO3, (Ca = 40, C =12, O = 16)
  • A. 56
  • B. 100
  • C. 76
  • D. 90
View Answer & Discuss (4) JAMB 2015
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2799

When steam is passed over red hot carbon the substances produced are

  • A. hydrogen and trioxocarbonate (IV) acid
  • B. hydrogen, oxygen and carbon (IV) oxide
  • C. hydrogen and carbon (ii) oxide
  • D. hydrogen and carbon (IV) oxide
View Answer & Discuss (2) JAMB 2015
2800
20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]
  • A. 0.03 mol dm3
  • B. 0.12 mol dm3
  • C. 0.27 mol dm3
  • D. 0.45 mol dm3
  • E. 0.90 mol dm3
View Answer & Discuss (6) NECO 2001
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