Metallurgy
Metallurgy is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2019, 2024). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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कल्सिनेशन प्रक्रियेतून ________ बाहर पडतो. During calcination process
During calcination, ores are heated strongly below their melting point in the absence of air. Depending on the ore type, it can release carbon dioxide (from carbonates) or water (from hydrated oxides).
खालीलपैकी कोणती/त्या धातुंची/च्या जोडी/जोड्या त्यांच्या खनिजांपासून वेगळे करण्यासाठी साईनाईड जटिल आयनचे द्रावण वापरतात ? / Which of the following pair/pairs of metal/metals can be extracted from their ores by using cyanide complex solutions ?
(a)Cu आणि Au / Cu and Au
(b)Co आणि Ag / Co and Ag
(c)Au आणि Ag / Au and Ag
(d)Na आणि Hg / Na and Hg
Cyanide process (MacArthur-Forrest cyanide process) is a hydrometallurgical technique used for extracting precious metals like Gold (Au) and Silver (Ag) from their ores.