WB JEE- Previous Year Papers Previous Year Questions

1

2016 · Chemistry · Organic Chemistry · General Organic Chemistry

WB JEE 2016

The correct order of basicity of the following compounds is

A

1 < 2 < 3 < 4

B

1 < 2 < 4 < 3

C

2 < 1 < 3 < 4

D

4 < 3 < 2 < 1

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2

2017 · Physics · Modern Physics · Electronic Devices

WB JEE 2017

In the given circuit, the binary inputs at A and B are both 1 in one case and both 0 in the next case. The respective outputs at Y in these two cases will be

A

1, 1

B

0, 0

C

0, 1

D

1, 0

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3

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

A

\(-\)0.35 V

B

+ 0.35 V

C

+ 1.17 V

D

\(-\)1.17 V

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4

2019 · Chemistry · Physical Chemistry · Radioactivity And Nuclear Chemistry

WB JEE 2019

The half-life period of \({}_{53}{I^{125}}\) is 60 days. The radioactivity after 180 days will be

A

25%

B

12.5%

C

33.3%

D

3.0%

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5

2020 · Chemistry · Physical Chemistry · Liquid Solution

WB JEE 2020

Equal masses of ethane and hydrogen are mixed in an empty container at 298 K. The fraction of total pressure exerted by hydrogen is

A

15:16

B

1:1

C

1:4

D

1:6

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6

2021 · Chemistry · Physical Chemistry · Liquid Solution

WB JEE 2021

When 20 g of naphthoic acid (C₁₁H₈O₂) is dissolved in 50 g of benzene, a freezing point depression of 2K is observed. The van't Hoff factor (i) is [K_f = 1.72 K kg mol^\(-\)1]

A

0.5

B

1.0

C

2.0

D

3.0

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