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Test for cobalt with KNO2 (yellow precipitate)

This type of question, asked 2 times: 9 Apr 2024, 24 Jan 2025. All 2 questions below, oldest first.

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  1. Question 1

    9 Apr 2024

    144
    Consider the following test for a group-IV cation. M2++H2 S→AM^{2 +}+H_{2}\text{ }S \rightarrow A (Black precipitate) + byproduct A+A + aqua regia →B+NOCl+S+H2O\rightarrow B + NOCl + S +H_{2}O B+KNO2+CH3COOH→C+B +KNO_{2}+CH_{3}COOH \rightarrow C + byproduct The spin only magnetic moment value of the metal complex C is _____ BM. (Nearest integer)

  2. Question 2

    24 Jan 2025

    108
    Find the compound 'A' from the following reaction sequences.
    A→aqua−regiaB  →(1)KNO2[NH4OH](2)AcOHyellow ppt A\overset{aqua - regia}{\rightarrow}B\text{~ }\underset{\left( 2 \right)AcOH}{\overset{\left( 1 \right)KNO_{2}\lbrack NH_{4}OH\rbrack}{\rightarrow}}\text{yellow ppt~}

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