1.

Whcihg of the following hydrogen halides react (s) with AgNO_(3) (aq) to give a precipitate that dissolves in Na_(2)S_(2)O_(3) (aq)

Answer»

HCl
HF
HBr
HI

Solution :HF does not gives any ppt. with `AgNO_(3)` since AgF is soluble in water. However, HCl, HBr and HI all react with `AgNO_(3)` to give first ppt. of the CORRESPONDING silver halide which DISSOLVES in aqueous `Na_(2)S_(2)O_(3)` solution.
`{:(HCl + AgNO_(3) rarr underset("White ppt.")(AgCl) + HNO_(3)),(HBr + AgNO_(3) rarr underset("Pale YELLOW ppt.")(AGBR) + HNO_(3)),(HI + AgNO_(3) rarr underset("Yellow ppt.")(AgI) + HNO_(3)),(AgCl (or AgBr or AgI) + 2 Na_(2)S_(2) O_(3) rarr underset(("dissolves to gives colourless solution"))underset("Sod. argentothiosulphat")(Na_(3)[Ag(S_(2)O_(3))_(2)])+ NaCl (or NaBr or Nal)):}`


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