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The correct stability order is/are:

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The correct stability order is/are: 

(I)  MgCO3 < CaCO3 < Na2CO3

(II)  Li2CO3 < Na2CO3 < K2CO3

(III)  CaO < MgO < BeO

(IV) BaSO4 < SrSO4 < MgSO4

(a) II, IV (b) I, IV (c) II, III, IV (d) I, II, III

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Correct option   (d)  I, II, III 

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