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Colours of precipitates and complexes in salt analysis

This type of question, asked 3 times: 11 Apr 2023, 1 Feb 2024, 8 Apr 2024. All 3 questions below, oldest first.

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  1. Question 1

    11 Apr 2023

    139
    Match List I with List II. List I (Complex): (A) Mg(NH4)PO4Mg\left( NH_{4} \right)PO_{4}; (B) K3[Co(NO2)6]K_{3}\left\lbrack Co\left( NO_{2} \right)_{6} \right\rbrack; (C) MnO(OH)2MnO(OH)_{2}; (D) Fe4[Fe(CN)6]3Fe_{4}\left\lbrack Fe(CN)_{6} \right\rbrack_{3}. List II (Colour): (I) Brown; (II) White; (III) Yellow; (IV) blue. Choose the correct answer from the options given below:

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  2. Question 2

    1 Feb 2024

    53
    The number of white coloured salts among the following is . (A) SrSO4SrSO_{4} (B) Mg(NH4)PO4Mg\left( NH_{4} \right)PO_{4} (c) BaCrO4BaCrO_{4} (D) Mn(OH)2Mn(OH)_{2} (E) PbSO4PbSO_{4} (F) PbCrO4PbCrO_{4} (G) AgBrAgBr (H) PbI2PbI_{2} (I) CaC2O4CaC_{2}O_{4} (J) [Fe(OH)2(CH3COO)]\left\lbrack Fe(OH)_{2}\left( CH_{3}COO \right) \right\rbrack

  3. Question 3

    8 Apr 2024

    48
    Match List I with List II
    List-I (Compound)List-II (Colour)
    A
    Fe4[Fe(CN)6]3⋅xH2OFe_{4}\left\lbrack Fe(CN)_{6} \right\rbrack_{3}\cdot xH_{2}O
    		I.Violet
    B.
    [Fe(CN)5NOS]4−\left\lbrack Fe(CN)_{5}NOS \right\rbrack^{4 -}
    		II.Blood Red
    C.
    [Fe(SCN)]2+\lbrack Fe(SCN)\rbrack^{2 +}
    		III.Prussian Blue
    D.
    (NH4)3PO4⋅12MoO3\left( NH_{4} \right)_{3}PO_{4}\cdot 12MoO_{3}
    		IV.Yellow
    Choose the correct answer from the options given below:

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