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# Which of the following arrangements show the correct order of increasing lattice energy ?

$(a)\;BaSO_4 < SrSO_4 < CaSO_4 < MgSO_4 \\(b)\; MgCO_3 < CaCO_3 < SrCO_3 < BaCO_3 \\ (c)\; Lif < LiCl < LiBr < LiF \\ (d)\; NaF < KF < Rbf < CsF$

$MgCO_3 < CaCO_3 < SrCO_3 < BaCO_3$ is correct .
Hence b is the correct answer.