A weakly alkaline solution of permanganate is electrolysed for 50 minutes using 2A current. The amount of oxide of manganese obtained. (Given : Atomic mass Mn = 55 amu and O = 16 amu)

2 Views | Posted a month ago

Asked by Shiksha User

1 Answer

Answered by

Raj Pandey | Contributor-Level 9

a month ago

Charge (q) $= i t = 2 \times 50 \times 60 = 6000 C$

$\Rightarrow 6000 C = (\frac{6000}{96500} F)$

${M n O}_{4}^{-} + 3 e^{(-)} + 2 H_{2} O \overset{weakly alkaline medium}{?} {M n O}_{2} + 4 {O H}^{-}$

Mass of ${M n O}_{2}$ deposited $= \frac{1}{3} \times \frac{6000}{96500} \times 87 = 1.8$

Charge (q)   <math> <mo>=</mo> <mi>i</mi> <mi>t</mi> <mo>=</mo> <mn>2</mn> <mo>×</mo> <mn>50</mn> <mo>×</mo> <mn>60</mn> <mo>=</mo> <mn>6000</mn> <mi mathvariant="normal">C</mi> </math>   <math> <mo>⇒</mo> <mrow> <mi mathvariant="normal"> </mi> </mrow> <mn>6000</mn> <mi>C</mi> <mo>=</mo> <mfenced separators="|"> <mrow> <mrow> <mfrac> <mrow> <mrow> <mn>6000</mn> </mrow> </mrow> <mrow> <mrow> <mn>96500</mn> </mrow> </mrow> </mfrac> <mi>F</mi> </mrow> </mrow> </mfenced> </math> <math> <msubsup> <mrow> <mrow> <mi mathvariant="normal">M</mi> <mi mathvariant="normal">n</mi> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>4</mn> </mrow> </mrow> <mrow> <mrow> <mo>-</mo> </mrow> </mrow> </msubsup> <mo>+</mo> <mn>3</mn> <msup> <mrow> <mrow> <mi mathvariant="normal">e</mi> </mrow> </mrow> <mrow> <mrow> <mo>(</mo> <mo>-</mo> <mo>)</mo> </mrow> </mrow> </msup> <mo>+</mo> <mn>2</mn> <msub> <mrow> <mrow> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mi mathvariant="normal">O</mi> <mover> <mrow> <mrow> <mo>?</mo> </mrow> </mrow> <mrow> <mrow> <mtext> </mtext> <mtext>weakly alkaline medium</mtext> <mtext> </mtext> </mrow> </mrow> </mover> <msub> <mrow> <mrow> <mi mathvariant="normal">M</mi> <mi mathvariant="normal">n</mi> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> <mo>+</mo> <mn>4</mn> <msup> <mrow> <mrow> <mi mathvariant="normal">O</mi> <mi mathvariant="normal">H</mi> </mrow> </mrow> <mrow> <mrow> <mo>-</mo> </mrow> </mrow> </msup> </math>   Mass of <math> <msub> <mrow> <mrow> <mi mathvariant="normal">M</mi> <mi mathvariant="normal">n</mi> <mi mathvariant="normal">O</mi> </mrow> </mrow> <mrow> <mrow> <mn>2</mn> </mrow> </mrow> </msub> </math>    deposited <math> <mo>=</mo> <mfrac> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> </mfrac> <mo>×</mo> <mfrac> <mrow> <mrow> <mn>6000</mn> </mrow> </mrow> <mrow> <mrow> <mn>96500</mn> </mrow> </mrow> </mfrac> <mo>×</mo> <mn>87</mn> <mo>=</mo> <mn>1.8</mn> </math>

0 Upvotes 0 Downvotes

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

65k Colleges
1.2k Exams
687k Reviews
1800k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

A weakly alkaline solution of permanganate is electrolysed for 50 minutes using 2A current. The amount of oxide of manganese obtained. (Given : Atomic mass Mn = 55 amu and O = 16 amu)

1 Answer

Learn more about...

Most viewed information

Most viewed information

Share Your College Life Experience

Didn't find the answer you were looking for?

Need guidance on career and education? Ask our experts

Your Question