1.

Account for the following:BiH3 is the strongest reducing agent amongst all the trihydrides of 15th group elements.H2S is less acidic than H2Te.When HCl reacts with powdered iron, it forms ferrous chloride and not ferric chloride.

Answer»
  1. Bi-H bond is weakest among all 15-group hydrides.
  2. H-Te bond is weaker than H-S bond.
  3. During reaction of iron and HCl, H2 gas evolves which prevents the oxidation of FeCl2 to FeCl3.
    Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)


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