निम्नलिखित अभिक्रिया से प्राप्त उत्पाद \(B\) में उपस्थित सीमावर्ती (अर्मिनल) ऑक्सीजन परमाणुओ की संख्या \(.............\) है। \(FeCr _2 O _4+ Na _2 CO _3+ O _2 \rightarrow A + Fe _2 O _3+ CO _2\) \(A + H ^{+} \rightarrow B + H _2 O + Na ^{+}\)

A \(6\)
B \(54\)
C \(9\)
D \(81\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(6\)

Step-by-step Solution

Detailed explanation

\(4 FeCr _{2} O _{4}+8 Na _{2} CO _{3}+7 O _{2} \rightarrow 8 Na _{2} CrO _{4}+2 Fe _{2} O _{3}\) \(+8 CO _{2}\) \(2 Na _{2} CrO _{4}+2 H ^{+} \rightarrow \underbrace{ Na _{2} Cr _{2} O _{7}}_{ B }+2 Na ^{+}+ H _{2} O\)

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 सूची - II से मिलान कीजिए।

सूची - I	सूची - II
(A) निर्वात की चुंबकशीलता	(I) \(\left[\mathrm{M} \mathrm{~L}^2 \mathrm{~T}^{-2}\right]\)
(B) चुंबकीय क्षेत्र	(II) \(\left[\mathrm{M} \mathrm{~T}^{-2} \mathrm{~A}^{-1}\right]\)
(C) चुंबकीय आघूर्ण	(III) \(\left[\mathrm{M} \mathrm{~L} \mathrm{~T}^{-2} \mathrm{~A}^{-2}\right]\)
(D) मरोड़ी नियतांक	(IV) \(\left[\mathrm{L}^2 \mathrm{~A}\right]\)

नीचे\(\text{ }\)दिए\(\text{ }\)गए\(\text{ }\)विकल्पों\(\text{ }\)में\(\text{ }\)से\(\text{ }\)सही\(\text{ }\)उत्तर\(\text{ }\)चुनिए\(\text{ }\):

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