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Which of the following is / are correct for negative lattice energy

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Lattice energy of $M g F_{2}$ is less than MgO

Lattice energy of $M g C O_{3}$ is more than MgO

Lattice energy of $M g F_{2}$ is less than MgO

Lattice energy of MgO is more than $M g C O_{3}$

answer is A, B.

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Detailed Solution

(A) is correct because lattice energy of MgO $- 3923 a n d t h a t o f M g C O_{3} i s - 3178 k J m o l^{- 1}$

(B) is correct because lattice energy of $M g F_{2} i s - 2906 a n d M g O i s - 3923 k J m o l^{- 1}$

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