JEE Main 2020 Question Paper (02-Sep-2020) (Shift 1)

Question 1

The figure that is not a direct manifestation of the quantum nature of atom is :

Accepted Answer

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Question 2

Consider that a $d^{6}$ metal ion $\left(\mathrm{M}^{2+}\right)$ forms a complex with aqua ligands, and the spin-only magnetic moment of the complex is $4.90\ \mathrm{BM}$. The geometry and the crystal field stabilization energy of the complex is :

Accepted Answer

tetrahedral and $-0.6{\mathrm{\Delta}}_{\mathrm{t}}$

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$	ext{octahedral and } -2.4 \Delta_0 + 2P$

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$	ext{octahedral and } -1.6 \Delta_{0}$

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$	ext{tetrahedral and } -1.6 \Delta_{t} + 1P$

Question 3

In Carius method of estimation of halogen, $0.172 \mathrm{g}$ of an organic compound showed presence of $0.08 \mathrm{g}$ of bromine. Which of these is the correct structure of the compound?

Accepted Answer

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$\mathrm{CH}_3\mathrm{CHBr}_2$

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$\mathrm{H}_3\mathrm{C}-\mathrm{CH}_2-\mathrm{Br}$

Question 4

For octahedral $\mathrm{Mn}\left(\mathrm{II}\right)$ and tetrahedral $\mathrm{Ni}\left(\mathrm{II}\right)$ complexes, consider the following statements: $(\mathrm{I})$ both the complexes can be high spin. $(\mathrm{II})$ $\mathrm{Ni}\left(\mathrm{II}\right)$ complex can very rarely be of low spin. $(\mathrm{III})$ with strong field ligands, $\mathrm{Mn}\left(\mathrm{II}\right)$ complexes can be low spin. $(\mathrm{IV})$ aqueous solution of $\mathrm{Mn}\left(\mathrm{II}\right)$ ions is yellow in color. The correct statements are:

Accepted Answer

$(\mathrm{I})$, $(\mathrm{II})$ and $(\mathrm{III})$ only

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$(\mathrm{I})$ and $(\mathrm{II})$ only

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$(\mathrm{I})$, $(\mathrm{II})$ and $(\mathrm{IV})$ only

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$(\mathrm{II})$, $(\mathrm{III})$ and $(\mathrm{IV})$ only

Question 5

The major aromatic product $\mathrm{C}$ in the following reaction sequence will be :

Accepted Answer

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