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metal + kwas - sól + wodór
2fe + 6hcl - 2fecl3 + 3h2
II
tl.metalu + kwas - sól + woda
fe2o3 + 6hcl - 2fecl3 + 3h2o
III
zasada + kwas - sól + woda
2fe(oh)3 + 6hcl - 2fecl3 + 6h2o