Copper is refined by/ कॉपर द्वारा परिष्कृत किया जाता है

Copper is refined by/ कॉपर द्वारा परिष्कृत किया जाता है

(1) roasting / भूनना  (2) oxidation/ ऑक्सीकरण 
(3) electrolysis/ इलेक्ट्रोलिसिस  (4) zone refining/ जोन रिफाइनिंग 

Answer / उत्तर :-

(1) roasting/ भूनना  

Explanation / व्याख्या :-

Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce “calcine” and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals./ Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce “calcine” and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals.