JEE Main 2023ChemistryElectrochemistryHardNumerical

JEE Main 2023Electrochemistry Question with Solution

JEE Main 2023 (13 Apr Shift 1)

Question

A metal surface of 100 cm2 area has to be coated with nickel layer of thickness 0.001 mm. A current of 2A was passed through a solution of NiNO32 for x seconds to coat the desired layer. The value of x is _________. (Nearest integer)

(ρNi (density of Nickel) is 10 g mL1, Molar mass of Nickel is 60 g mol-1 F=96500 Cmol-1)

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Show full solutionCorrect answer: 16
Correct answer
16

Step-by-step explanation

One equivalent of substance deposited for 96500C(one Faraday).

i×t Columbus of charge can be utilised to get w g of substance.

Millimoles of Ni coated

=(2x)10096500×2

=10x965

Mass of Ni=x965600

=600x965mg

Volume=60x965×10-3 cm3

=100×10-4

x=0.1608×103

161

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About this question

This is a previous-year question from JEE Main 2023, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.