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JEE Main levelSingle correct optionDifficulty 2 of 3sb142

Dolomite, $MgCO X_{3} \cdot CaCO X_{3}$ , is heated to a temperature at which only the less stable carbonate decomposes. The solid residue is:

A $MgO$ and $CaO$
B $MgO$ and $CaCO X_{3}$
C $MgCO X_{3}$ and $CaO$
D $Mg$ and $CaCO X_{3}$

Answer: B

MgCO X_{3}

is less stable than

CaCO X_{3}

, because

Mg X^{2 +}

is smaller and more polarising. Partial calcination therefore gives

MgCO X_{3} \cdot CaCO X_{3} MgO + CaCO X_{3} + CO X_{2}

with

CaCO X_{3}

left intact.

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