TS EAMCET · Chemistry · General Principles and Processes of Isolation of Metals
Among the following, the calcination process is
- A \(2 \mathrm{Cu}_2 \mathrm{~S}+3 \mathrm{O}_2 \xrightarrow{\Delta} 2 \mathrm{Cu}_2 \mathrm{O}+2 \mathrm{SO}_2 \uparrow\)
- B \(\mathrm{Al}_2 \mathrm{O}_3\) \((\mathrm{s})+2 \mathrm{NaOH}(a q)+3 \mathrm{H}_2 \mathrm{O}\) (l) \(\longrightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right](\mathrm{aq})\)
- C \(2 \mathrm{CuFeS}_2+\mathrm{O}_2 \longrightarrow \mathrm{Cu}_2 \mathrm{~S}+2 \mathrm{FeS}+\mathrm{SO}_2 \uparrow\)
- D \(\mathrm{Fe}_2 \mathrm{O}_3 \cdot x \mathrm{H}_2 \mathrm{O} \xrightarrow{\Delta} \mathrm{Fe}_2 \mathrm{O}_3\) (s) \(+x \mathrm{H}_2 \mathrm{O}\) (g)
Answer & Solution
Correct Answer
(D) \(\mathrm{Fe}_2 \mathrm{O}_3 \cdot x \mathrm{H}_2 \mathrm{O} \xrightarrow{\Delta} \mathrm{Fe}_2 \mathrm{O}_3\) (s) \(+x \mathrm{H}_2 \mathrm{O}\) (g)
Step-by-step Solution
Detailed explanation
Calcination involves heating it removes the volatile matter which escapes leaving behind the metal oxide: \(\mathrm{Fe}_2 \mathrm{O}_3 + \mathrm{H}_2 \mathrm{O}(\mathrm{s}) \xrightarrow{\Delta} \mathrm{Fe}_2 \mathrm{O}_3(\mathrm{~s})+\mathrm{xH}_2 \mathrm{O}(\mathrm{g})\)
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