What is sequence of the solubility of the following compounds and why------
1)BeSO4,MgSO4,CaSO4
2)LiF,LiCl,LiBr.

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Solution

Dear student ,

The solubility of the salt depend upon their Ionic nature which can be determined by Fajan's Rule :
1) larger the size of the Cations more ionic substance will be : CaSO₄ > MgSO₄ > BeSO₄
2) Smaller the size of the Anions more ionic will be : LiF > LiCl > LiBr
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B e S O_{4}, M g S O_{4}, C a S O_{4}, S r S O_{4}, B a S O_{4}

H_{2} O

B e S O_{4} > M g S O_{4} > C a S O_{4} > B a S O_{4}

B e (O H)_{2} > M g (O H)_{2} > C a (O H)_{2} > B a (O H)_{2}

L i O H < N a O H < K O H < R b O H

L i_{2} C O_{3} < N a_{2} C O_{3} < K_{2} C O_{3} < R b_{2} C O_{3}

H_{2} O ?

(1) B e S O_{4} > M g S O_{4} > C a S O_{4} > B a S O_{4}

(2) B e (O H)_{2} > M g (O H)_{2} > C a (O H)_{2} > B a (O H)_{2}

(3) L i O H < N a O H < K O H < R b O H

(4) L i_{2} C O_{3} < N a_{2} C O_{3} < K_{2} C O_{3} < R b_{2} C O_{3}

L i I > L i B r > L i C l > L i F

B e S O_{4}, M g S O_{4}, C a S O_{4}

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