A) Ca, which acts as reducing agent
B) Al, which acts as oxidising agent
C) Ag, which acts as reducing agent
D) Au, which acts as oxidising agent
Correct Answer: A
Solution :
Ca is very active metal. It acts as reducing agent and reacts with water at room temperature evolving dihydrogen. \[Ca+2{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}+{{H}_{2}}\uparrow \] On the other hand, Al is less reactive metal. It also acts as reducing agent and decomposes boiling water liberating \[{{H}_{2}}\]. \[2Al+3{{H}_{2}}O\] (boiling) \[\xrightarrow{Heat}A{{l}_{2}}{{O}_{3}}+3{{H}_{2}}\uparrow \] Whereas noble metals Ag and Au are not influenced by water.
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