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1721

If sulphur is dissolved in carbon (IV) sulphide and  the solution allowed to evaporate the allotrope of sulphur formed is

  • A. plastic sulphur
  • B. amorphous sulphur
  • C. rhombic sulphur
  • D. monoclinc sulphur
  • E. colloidal sulphur
View Answer & Discuss (9) WAEC 1989
1722
If sulphur is dissolved in carbon (IV) sulphide and the solution is allowed to evaporate, the allotrope of sulphur formed is
  • A. plastic sulphur
  • B. amorphous sulphur
  • C. rhombic sulphur
  • D. monoclinc sulphur
  • E. colloidal sulphur
View Answer & Discuss WAEC 1989
1723

Given that for the reaction. N2(g) + 3H2(g) ⇌ 2NH3(g) ∆H = -92kJ. What is the enthalpy of formation of ammonia from its elements?

  • A. -46KJ mol -1
  • B. -184KJmol -1
  • C. -92KJmol -1
  • D. 184KJmol -1
  • E. +46KJmol -1
View Answer & Discuss (3) WAEC 1989
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1724
The following are s-block elements except
  • A. lithium
  • B. magnesium
  • C. potassium
  • D. calcium
  • E. aluminium
View Answer & Discuss (2) WAEC 1989
1725
Which of the following statements is not true of tin? it
  • A. is a p-block element
  • B. is extracted from cassiterite SnO 2
  • C. is used for protecting iron containers from corrosion
  • D. combines with copper to form the alloy brass
  • E. shows two oxidation states, + 2 and + 4 in most of its compounds
View Answer & Discuss (4) WAEC 1989
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