brief describ the procedure that should be followed to carry out chrome-plating on a worm-out components of a motorcycle.Is an aqueous solution of chromium nitrates a good electrolyte for this job?Justify your answer giving appropriate reason
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Answer:
Correct option is B)
Volume to be covered
=(0.25×10
4
cm
2
)×(2×10
−3
cm)=5cm
3
⇒ Mass of Cr to be deposited =5×7.19g
=35.95g
≡
52
35.95
mol
=0.69mol
Cr
2
O
7
2−
+14H
⊕
+12e
−
→2Cr+7H
2
O
Now, 2mol Cr deposited ≡ 12 F electricity
⇒ 0.59 mol Cr deposited ≡
2
12
×0.069F
=
96500
It
=
96500
75×t
t=1.48h≈1.5h
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