A) \[{{O}_{2}}\] and CO respectively
B) \[{{O}_{2}}\] and Zn dust respectively
C) \[HN{{O}_{3}}\]and Zn dust respectively
D) \[HN{{O}_{3}}\] and CO respectively
Correct Answer: B
Solution :
Silver ore is oxidised by using oxygen from air \[4Ag+8NaCN+2{{H}_{2}}O+{{O}_{2}}(air)\xrightarrow[{}]{{}}\] \[4Na[Ag{{(CN)}_{2}}]+4NaOH\] In this. Ag(0) is oxidised to Ag (+ 1). Silver is precipitated from the solution by addition of zinc powder. \[2Na[Ag{{(CN)}_{2}}]+Zn\xrightarrow[{}]{{}}N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\downarrow \]Silver gets reduced from Ag (+1) to Ag (0).
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