Select the incorrect statements

(1) Ca(PO4)2 is a tertiary phosphate and not soluble in H2O hence it is no use for plants. However (NH4)2SO4, Ca(H2PO4)2 and (CaCN2 + C) can be used directly as fertilizer.(2) In alkali metals, only Li2SO4 does not form alum due to small size of Li⊕(3) Due to its e- deficient nature, it can be easily hydrolyzed.BeCl2+2H2O⟶Be(OH)2+2HCl(4) Due to almost equal ionic radius of K⊕ and NH4+ ions.