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JEE Main 201912 JanuaryEvening Shift

Exam: JEE Main
Year: 2019
Date: 12 January
Shift: Evening Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2019 · 12 January · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals

The pair that does not require calcination is

The pair that does not require calcination is

Options

A $ZnO$ and ${Fe}_{2}{O}_{3} . {xH}_{2}O$
B $ZnO$ and $MgO$
C ${ZnCO}_{3}$ and $CaO$
D ${Fe}_{2}{O}_{3}$ and ${CaCO}_{3} . {MgCO}_{3}$

Correct answer

B. $ZnO$ and $MgO$

Step-by-step solution

Calcination is required for hydroxide carbonate and hydrated ores. So, calcination for

ZnO

and

MgO

will not occur.

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