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  4. A sodium salt of an unknown anion when treated with MgCl2 gives white precipitate only on boiling. The anion is

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Q. A sodium salt of an unknown anion when treated with $ MgCl_2 $ gives white precipitate only on boiling. The anion is

IIT JEEIIT JEE 2004The s-Block Elements

Solution:

$Mg \left( HCO _{3}\right)_{2}$ on boiling decomposes to give white precipitate of $MgCO _{3}$ as:
$Mg \left( HCO _{3}\right)_{2}(a q) \xrightarrow{\text { Heat }} MgCO _{3} \downarrow+ H _{2} O + CO _{2} \uparrow$