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Metallurgy — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMetallurgy4 Marks
Question
From the list of concentrated oxide ores mentioned here, identify their reduction processes. Write the chemical equations involved.
(i) ZnO, (ii) HgO, (iii) Cr2O3, (iv) CuO
✓

Answer

(i) ZnO is reduced by coke at high temperature
$ZnO + C \xrightarrow{\Delta} Zn + CO$
(ii) HgO is reduced by heating alone.
$2 HgO \xrightarrow{\Delta} 2 Hg + O _2$
(iii) Cr2O3 is reduced by using aluminium as a reducing agent
Cr2O3+2Al → Al2O3 + 2Cr
(iv) CuO is reduced by using hydrogen gas as reducing agent
CuO + H2 → Cu + H2O

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