JEE Mains · Chemistry · STD 12 - p -Block elements - ll

The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product \('A'\). The reaction \(1\, mol\) of \('A'\) with excess of \(AgNO _{3}\) in aqueous medium gives ............... mol\((s)\) of \(Ag\). (Round off to the Nearest Integer).

A \(8\)
B \(10\)
C \(4\)
D \(6\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(4\)

Step-by-step Solution

Detailed explanation

\(P _{4}+3 OH ^{-}+3 H _{2} O \rightarrow PH _{3}+\underset{( A )}{3 H _{2} PO _{2}^{-}}\) \(\underset{1 \text { mole }}{ H _{2} PO _{2}^{-}}+\underset{\text { excess }}{+4 Ag ^{+}}+2 H _{2} O \rightarrow \underset{4 \text { mole }}{4 Ag +} H _{3} PO _{4}+3 H ^{+}\)

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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Match the LIST-I with LIST-II

LIST-I (Classification of molecules based on octet rule)	LIST-II (Example)
(A) Molecules obeying octet rule	(I) NO, NO₂
(B). Molecules with incomplete octet	(II) BCl₃, AlCl₃
(C) Molecules with incomplete octet with odd electron	(III) H₂SO₄, PCl₅
(D) Molecules with expanded octet	(IV) CCl₄, CO₂

Choose the correct answer from the options given below:

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