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[" In the reaction "H(2)S rightleftharpo...

[" In the reaction "H_(2)S rightleftharpoons2H^(+)+S^(2-)," when "NH_(4)OH" is "],[" added,then "],[" (1) "S^(2-)" is precipitated "],[" (2) no action takes places "],[" (3) concentration of "S^(2-)" decreases "],[" (4) concentration of "S^(2-)" increases "]

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