MPSC Rajyaseva 2019 GS Paper 1 — Question 15

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कल्सिनेशन प्रक्रियेतून ________ बाहर पडतो. During calcination process

1)फक्त कार्बनडायऑक्साईड बाहेर पडतो / Only CO2 is given out

2)फक्त हैड्रेटमधून पाणी बाहेर पडते / Only H2O from hydrates is given out

3)(1) किंवा (2) हे धातूकांवर अवलंबुन असते / (1) or (2), depending on type of ore✓ Correct

4)हायड्रोजन सल्फाईड बाहेर पडतो / H2S is given out

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).

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