Question

6) Of the choices below, which would be the best for the lining of a tank intended for use in storage of hydrochloric acid? A) copper B) zinc C) nickel D) iron E) tin 7) Which of these metals will be oxidized by the ions of cobalt? A) nickel B) tin C) iron D) copper E) silver 8) Which of these metals will be oxidized by the ions of aluminum? A) magnesium B) zinc C) chromium D) iron E) nickel 9) Sodium does not occur in nature as Na (s) because A) it is easily reduced to Na- B) it is easily oxidized to Na+ C) it reacts with water with great difficulty D) it is easily replaced by silver in its ores E) it undergoes a disproportionation reaction to Na- and Na+ 10) Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than iron. Which of the following correctly lists the elements in order of increasing activity? A) Co Ni < Fe < Zn< Al B) Ni < Fe < Co <zn< Al C) Ni < Co < Fe < Zn< Al D) Fe < Ni < Co E) Zn < Al < Co < Ni < Fe v v v v v v

Answer 1

(6) answer is Copper

(7) answer is Iron

(8) answer is Magnesuim

(9) answer is C ( It is easily oxidized to Na+)

(10) answer is C (Ni<Co<Fe<Zn<Al)