Leaching
Leaching is a Geography concept from the MPSC syllabus, tested in 2 past MPSC questions (2023, 2024). Below are those real questions with their correct answers and explanations.
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24. खालीलपैकी कोणत्या मृदेत लोह व बॉक्साइट खनिजाचे प्रमाण अधिक असते ? Which of the following soil contain the maximum proportion of iron and bauxite minerals ?
Laterite soil (जांभी मृदा) is formed under conditions of high temperature and heavy rainfall with alternate wet and dry periods, leading to the leaching of silica and leaving behind rich deposits of iron and aluminium/bauxite 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.