39. Observe the following chemical reactions.
i) Fe2O3 + 2Al —
2Fe + Al2Os
u) ZnO +
Zn + CO
m) Fe2O3 + 3C
2Fe +3CO
iv) Al2O3 + 3C -
2Al + 3CO
Which of the above reaction is wrong? How is the metal present in the
wrong equation extracted? Which of the above reaction can be used to
join the broken parts of the machines. Why?
Answers
Answer:
the second equation - ZnO+ Zn + Co is wrong.
Zinc is extracted through carbon reduction of the ore Zinc blende (ZnS) ore by specially designed blast furnaces. ... Ore forms froth and comes to the surface, and impurities are left behind in water. Roasting - The concentrated ore is heated in a blast furnace at 900o C where Zinc sulphide is converted to Zinc oxide.
the equation Fe2O3 + 3C
2Fe +3CO is also known as thermite reaction it can be used to join broken parts of machines. A thermite reaction (a type of aluminothermic reaction) is one in which aluminium metal is oxidized by an oxide of another metal, most commonly iron oxide. Although the reactants are stable at room temperature, when they are exposed to sufficient heat to ignite, they burn with an extremely intense exothermic reaction.