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Precipitates of cations with potassium ferrocyanide

This type of question, asked 2 times: 24 Jan 2025, 2 Apr 2025. All 2 questions below, oldest first.

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  1. Question 1

    24 Jan 2025

    49
    Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with K4[Fe(CN)6]K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack is :
    Cu2+,Fe3+,Ba2+,Ca2+,NH4+,Mg2+,Zn2+Cu^{2 +},Fe^{3 +},Ba^{2 +},Ca^{2 +},NH_{4}^{+},Mg^{2 +},Zn^{2 +}

  2. Question 2

    2 Apr 2025

    41
    Choose the correct tests with respective observations. (A) CuSO4{CuSO}_{4} (acidified with acetic acid) + K4[Fe(CN)6]→K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \rightarrow Chocolate brown precipitate. (B) FeCl3+K4[Fe(CN)6]→{FeCl}_{3} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \rightarrow Prussian blue precipitate. (C) ZnCl2+K4[Fe(CN)6]{ZnCl}_{2} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack, neutralised with NH4OH{NH}_{4}OH →\rightarrow White or bluish white precipitate. (D) MgCl2+K4[Fe(CN)6]→{MgCl}_{2} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack \rightarrow Blue precipitate. (E) BaCl2+K4[Fe(CN)6]{BaCl}_{2} + K_{4}\left\lbrack Fe(CN)_{6} \right\rbrack, neutralised with NaOH →\rightarrow White precipitate. Choose the correct answer from the options given below :

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