निम्नलिखित अभिक्रिया अनुक्रमों से यौगिक ' A ' ज्ञात कीजिए।
\(\mathrm{A} \xrightarrow{\text { aqua-regia }} \mathrm{B} \xrightarrow[\text { (2) } \mathrm{AcOH}]{\text { (1) } \mathrm{KNO}_2 \mid \mathrm{NH}_4 \mathrm{OH}} \text { yellow ppt }\)

A CoS
B ZnS
C NiS
D MnS

Verified Solution

Answer & Solution

Correct Answer

(A) CoS

Step-by-step Solution

Detailed explanation

दिए गए अभिक्रिया अनुक्रम में यौगिक \((A)\) CoS होने की संभावना है। \(\begin{aligned} \mathrm{CoS}+\mathrm{HNO}_3+3 \mathrm{HCl} \rightarrow \mathrm{Co}^{2+} & +\mathrm{S} \downarrow+\mathrm{NOCl} \uparrow \\ & +2 \mathrm{Cl}^{-}+2 \mathrm{H}_2 \mathrm{O}\end{aligned}\) उपरोक्त…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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From JEE Mains

सूची \(I\) का मिलान सूची \(II\) से कीजिए।

सूची \(I\)	सूची \(II\)
\(A\) \(Ni ( CO )_{4}\)	\(I\) \(sp ^{3}\)
\(B\) \({\left[ Ni ( CN )_{4}\right]^{2-} }\)	\(II\) \(S p^{3} d^{2}\)
\(C\) \({\left[ Co ( CN )_{6}\right]^{3-} }\)	\(III\) \({d^{2}}\)
\(D\) \({\left[ CoF _{6}\right]^{3-} }\)	\(IV\) \({s p^{3}}{d s p^{2}}\)

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