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JEE Main 202116 MarchEvening Shift
Exam
JEE Main
Year
2021
Date
16 March
Shift
Evening Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2021 · 16 March · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

When 35mL of 0 . 15M lead nitrate solution is mixed with 20mL of 0...

When 35mL35mL of 0.15M0 . 15M lead nitrate solution is mixed with 20mL20mL of 0.12M0 . 12M chromic sulphate solution, ____________×10−5\times {10}^{- 5} moles of lead sulphate precipitate out. (Round off to the Nearest Integer).

Correct answer

0

Step-by-step solution

3Pb(NO3)2+Cr2(SO4)3→3PbSO4+2Cr(NO3)33Pb{\left({NO}_{3}\right)}_{2} + {Cr}_{2}{\left({SO}_{4}\right)}_{3} \to 3{PbSO}_{4} + 2Cr{\left({NO}_{3}\right)}_{3}

{35ml20ml0.15M0.12M\begin{cases}35ml & 20ml \\ 0 . 15M & 0 . 12M\end{cases}

{=5.25m.mol=2.4m.mol5.25m.mol\begin{cases}= 5 . 25m . mol = 2 . 4m . mol & 5 . 25m . mol\end{cases}

=5.25×10−3mol= 5 . 25 \times {10}^{- 3}mol

Therefore moles of PbSO4{PbSO}_{4} formed

=5.25×10−3= 5 . 25 \times {10}^{- 3} =525×10−5= 525 \times {10}^{- 5}

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