Q15 / 125 · BITSAT 2017 · Chemistry

Which of the following reactions is an example of calcination process?

A
$2 Ag + 2 HCl + [O] ⟶ 2 AgCl + H_{2} O$
B
$2 Zn + O_{2} ⟶ 2 ZnO$
C
$2 ZnS + 3 O_{2} ⟶ 2 ZnO + 2 {SO}_{2}$
Correct answer
D
${MgCO}_{3} \overset{Δ}{⟶} MgO + {CO}_{2}$

Solution

The process of conversion of a concentrated ore into its oxide by heating in absence of or in limited supply of air is called calcination. It is usually done for hydroxide, hydrated oxides and carbonate ores.

${MgCO}_{3} \overset{Δ}{⟶} MgO + {CO}_{2} (g)$

Hence, the correct answer is option: 'D'.

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