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Which of the following is insoluble in HCl & $HNO_3$ ?
Option: 1
$BeSO_4$

Option: 2
$MgSO_4$

Option: 3
$CaSO_4$

Option: 4
$BaSO_4$

Answers (1)

best_answer

As we learnt

Test of Sulfite -

1) Add $BaCl_2$ solution which gives white precipitate

$Ba^{2+} +SO^{2-}_3 \rightarrow BaSO_3 \: White$

2) Add an $H_2O_2$ solution warm and then add a $BaCl_2$ solution

$SO^{2-}_3 +H_2O_{2} \rightarrow SO^{2-}_4 +H_2O$

$Ba^{2+}+ SO^{2-}_4 \rightarrow BaSO_4 (white)$

$BaSO_4$ is insoluble in HCl & $HNO_3$

- wherein

White ppt of $BaSO_4 \: and \: BaSO_4$ confirm the presence of $SO^{2-}_3$

$Ba^{2+}\: \: and\: \: SO_4^{2-}$ have almost similar size,so the lattice energy is very high due to this reason f $BaSO_4$ is insoulble in water and acids

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Pankaj

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