Answer

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1. *WAEC CHEMISTRY*

    

   (4aiii)
   (I) Sodium metal:
   2Na+H₂ –> NaH

   (II) Copper(II) chloride solution:
   CuCl₂+H₂ –> Cu+2HCl

   (III) Chlorine gas:
   H₂+Cl₂ –> 2HCl

   (4bi)
   (I)Tin:
   (PICK ANY ONE)
   (i) It is resistant to corrosion
   (ii) It does not readily react with food.
   (iii) It is non-toxic (harmless) to food.
   (iv) It forms a protective oxide layer that prevents rusting/corrosion.

   (II) Copper:
   (PICK ANY ONE)
   (i) It is a good conductor of electricity.
   (ii) It is ductile (can be drawn into wires).
   (iii) It has low electrical resistance.
   (iv)It is resistant to corrosion.

   (4bii)
   (I) Iron:
   (PICK ANY ONE)
   (i) Haematite (Fe₂O₃)
   (ii) Magnetite (Fe₃O₄)

   (II) Tin:
   Cassiterite(SnO₂)

   (4biii)
   (I) Iron:
   (PICK ANY ONE)
   -Steel
   -Cast iron

   (II) Copper:
   (PICK ANY ONE)
   -Brass
   -Bronze

   (4ci)
   Coke

   (4cii)
   C+H₂O(g) –> CO+H₂

    

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