Verified Solution • 2025–26 Session moderate QJEEM25Cheb91: JEE Main 2025 Chemistry - Class 12 JEEM25Cheb91 Solution amp; Find the compound ’ A ’ from the following reaction sequences. amp;A→ aqua-regia B→ (2) AcOH (1) KNO2∣NH4OH yellow ppt \begin{aligned}&\text { Find the compound ' } \mathrm{A} \text { ' from the following reaction sequences. }\\&\mathrm{A} \xrightarrow{\text { aqua-regia }} \mathrm{B} \xrightarrow[\text { (2) } \mathrm{AcOH}]{\text { (1) } \mathrm{KNO}_2 \mid \mathrm{NH}_4 \mathrm{OH}} \text { yellow ppt }\end{aligned}amp; Find the compound ’ A ’ from the following reaction sequences. amp;A aqua-regia B (1) KNO2∣NH4OH (2) AcOH yellow ppt Multiple Choice Options A NiS B MnS C ZnS D CoS Step-by-Step Verified Solution CoS→ Aquaregia CoCl2→2⋅AcOH1.KNO2/NH4OHK3[Co(NO2)6]↓ yellow \mathrm{CoS} \xrightarrow{\text { Aquaregia }} \mathrm{CoCl}_2 \xrightarrow[2 \cdot \mathrm{AcOH}]{\mathrm{1.KNO}_2 / \mathrm{NH}_4 \mathrm{OH}} \mathrm{K}_3\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right] \downarrow \text { yellow }CoS Aquaregia CoCl21.KNO2/NH4OH2⋅AcOHK3[Co(NO2)6]↓ yellow Related Learning Resources & Exam Preparation JEE Main PYQ Question Bank Browse year-wise authentic previous years' questions with solutions Authentic CBT Mock Tests Simulate official exam environment with live timer and percentile scoring