question_answer

The activity series consists of metals arranged in the order of their decreasing chemical activity. Name a metal from the activity series which itself or its compounds shows the following characteristics or properties. Name of the metal which/whose (a) Does not form an oxide at any temperature. (b) Forms an oxide even at an ordinary temperature. (c) Reacts with steam to give the metal oxide. (d) Does not liberate hydrogen with dilute acids. (e) Oxide is reduced to the metal by coke only. (f)  Oxide is not reduced to the metal by any reducing agent. (g) Hydroxide is converted to its oxide at elevated temperatures.                            (h)  Carbonate is converted to its oxide by thermal decomposition.                           (i)  Oxide, hydroxide and carbonate are stable to heat.                                           (j) Oxide, hydroxide and carbonate decompose to give the corresponding metal and oxygen.

Answer:

               

(a) \[Pt,\text{ }Au\]	(b) \[K\text{ }to\text{ }Ag\]
(c) \[Fe,\text{ }Sn\]	(d) \[Cu\]
(e) \[Fe,\text{ }Pb\]	(f) \[K,\text{ }Na\]
(g) \[Mg{{(OH)}_{2}}\]	(h)\[CaC{{O}_{3}}\]
(i) Na	(j) Ag