В перечне солей, формулы которых:

MgHPO4 , Mg(H2PO4)2 , Al2(SO4)3 , (NH4)2HPO4 , Ca(HCO3)2 , (NH4)2S ,BaSiO3 число кислых солей равно:

1) 6 2) 5 3) 4 4) 3
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