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

A d6 metal ion M2+ forms a tetrahedral complex with four aqua ligands and has spin-only magnetic moment 4.90 BM. Which option correctly gives its geometry and crystal-field stabilization energy, excluding pairing energy?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 3

An organic sample of mass 0.172 g contains 0.080 g of bromine by Carius analysis. Using the displayed choices and approximate atomic masses C = 12, H = 1, N = 14 and Br = 80, identify 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

Consider octahedral Mn(II) and ideal tetrahedral Ni(II) complexes in the crystal-field model, without distortion of the tetrahedral orbital degeneracy:(I) Both can have unpaired electrons in their high-spin configurations.(II) Ideal tetrahedral d8 Ni(II) can become fully spin-paired solely by increasing tetrahedral splitting.(III) Strong-field octahedral Mn(II) can be low spin.(IV) Aqueous Mn(II) is yellow.Which statements are correct?

Accepted Answer

(I) and (III) only

Answer

$(\mathrm{I})$ 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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