The lattice energy of the carbonates of Mg, Ca, Sr and Ba follow the order :

M g {C O}_{3}

C a {C O}_{3}

S r {C O}_{3}

B a {C O}_{3}

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C a {C O}_{3}

S r {C O}_{3}

B a {C O}_{3}

M g {C O}_{3}

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B a {C O}_{3}

S r {C O}_{3}

C a {C O}_{3}

M g {C O}_{3}

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S r {C O}_{3}

M g {C O}_{3}

C a {C O}_{3}

B a {C O}_{3}

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Solution

The correct option is B $M g {C O}_{3}$ > $C a {C O}_{3}$ > $S r {C O}_{3}$ > $B a {C O}_{3}$
Order of lattice energy of carbonates is
$M g C O_{3} > C a C O_{3} > S r C O_{3} > B a C O_{3}$
This is because as the ionic radius increases, the lattice energy decreases.

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Which one of the alkaline earth metal carbonates is thermally the most stable?

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