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1 May, 10:06

Which aqueous solution should form a precipitate with aqueous cu (no3) 2? 1. kno3 2. cuso4 3. k2so4 4. k2s?

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  1. 1 May, 10:26
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    Reaction of Cu (NO₃) ₂ with each salt is as follow,

    1) with KNO₃;

    Cu (NO₃) ₂ + KNO₃ → Cu (NO₃) ₂ + KNO₃

    Both salt products are water soluble.

    2) With CuSO₄;

    Cu (NO₃) ₂ + CuSO₄ → CuSO₄ + Cu (NO₃) ₂

    Again both Salt products are water soluble.

    3) With K₂SO₄;

    Cu (NO₃) ₂ + K₂SO₄ → CuSO₄ + 2 KNO₃

    Again both salt products are water soluble.

    4) With K₂S;

    Cu (NO₃) ₂ + K₂S → CuS + 2 KNO₃

    In this case CuS is water insoluble, hence precipitates out.

    Result:

    Option-4 is the correct answer.
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