A) iron has less affinity for oxygen than sulphur at high temperature
B) sulphur has less affinity for oxygen at high temperature
C) copper has more affinity for oxygen than sulphur at high temperature
D) copper has less affinity for oxygen than sulphur at high temperature.
Correct Answer: D
Solution :
: \[2C{{u}_{2}}S+3{{O}_{2}}\xrightarrow{{}}2C{{u}_{2}}O+2S{{O}_{2}}\] \[C{{u}_{2}}S+2C{{u}_{2}}O\xrightarrow{{}}6Cu+S{{O}_{2}}\]
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