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WB JEE 2018
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155
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180 mins
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WB JEE- Previous Year Papers
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2018 · Chemistry · Physical Chemistry · Electrochemistry
WB JEE 2018
Given the standard half-cell potentials (E\(^\circ\)) of the following as
$$\matrix{ {Zn \to Z{n^{2 + }} + 2{e^ - };} & {{E^o} = + 0.76V} \cr {Fe \to F{e^{2 + }} + 2{e^ - };} & {{E^o} = 0.41V} \cr }$$
Then the standard e.m.f. of the cell with the reaction \(F{e^{2 + }} + Zn \to Z{n^{2 + }} + Fe\) is
$$\matrix{ {Zn \to Z{n^{2 + }} + 2{e^ - };} & {{E^o} = + 0.76V} \cr {Fe \to F{e^{2 + }} + 2{e^ - };} & {{E^o} = 0.41V} \cr }$$
Then the standard e.m.f. of the cell with the reaction \(F{e^{2 + }} + Zn \to Z{n^{2 + }} + Fe\) is
2018 · Physics · Mechanics · Properties Of Matter
WB JEE 2018
The stress along the length of a rod (with rectangular cross-section) is 1% of the Young's modulus of its material. What is the approximate percentage of change of its volume? (Poisson's ratio of the material of the rod is 0.3).
2018 · Mathematics · Calculus · Differentiation
WB JEE 2018
The equation x log x = 3 \(-\) x
2018 · Chemistry · Physical Chemistry · Some Basic Concepts Of Chemistry
WB JEE 2018
How many moles of electrons will weigh one kilogram?
2018 · Physics · Electricity · Current Electricity
WB JEE 2018
Four resistors, 100\(\Omega\), 200\(\Omega\), 300\(\Omega\) and 400\(\Omega\) are connected to form four sides of a square. The resistors can be connected in any order. What is the maximum possible equivalent resistance across the diagonal of the square?
2018 · Mathematics · Calculus · Application Of Derivatives
WB JEE 2018
A particle is in motion along a curve 12y = x3. The rate of change of its ordinate exceeds that of abscissa in