JEE Main 2019 — Chemistry solution

JEE Main2019Chemistry

The reaction that does NOT define calcination is:

A
$F e_{2} O_{3} . X H_{2} O Δ F e_{2} O_{3} + X H_{2} O$
B
$C a C O_{3} . M g C O_{3} Δ C a O + M g O + 2 C O_{2}$
C
$Z n C O_{3} Δ Z n O + C O_{2}$
D
$2 C u_{2} S + 3 O_{2} Δ 2 C u_{2} O + 2 S O_{2}$

Solution

Calcination in carried out for carbonates and oxide ores in absence of oxygen. Roasting is carried out mainly for sulphide ores in presence of excess of oxygen.

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