જ્યારે \(35\, mL \,0.15\, M\) લેડ નાઈટ્રેટ દ્રાવણને \(0.12\, M\) ક્રોમિક સલ્ફેટનાં \(20\, mL\) દ્રાવણ સાથે મિશ્ર કરવામાં આવે છે ત્યારે લેડ સલ્ફેટનાં ....... \(\times 10^{-5}\) મોલ્સ (moles)નું અવક્ષેપન થશે. (નજીકનાં પૂર્ણાંકમાં રાઉન્ડ ઓફ કરો)

A \(565\)
B \(525\)
C \(235\)
D \(412\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(525\)

Step-by-step Solution

Detailed explanation

\(3 Pb \left( NO _{3}\right)_{2}+ Cr _{2}\left( SO _{4}\right)_{3} \rightarrow 3 PbSO _{4}+2 Cr \left( NO _{3}\right)_{3}\) \(35\, ml \quad 20\, ml\) \(0.15\, M \quad 0.12\, M\) \(5.25\, m \cdot mol =2.4\, m \cdot mol \quad 5.25 \,m \cdot mol\) \(=5.25 \times 10^{-3} \,mol\)…

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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