JEE Main 2020 Question Paper (05-Sep-2020) (Shift 1)

Question 1

Which of the following derivatives of alcohols is unstable in an aqueous base?

Accepted Answer

""

Answer

Answer

Answer

$\mathrm{RO}-\mathrm{CMe}_3$

Question 2

The values of the crystal field stabilization energies for a high spin $d^{6}$ metal ion in octahedral and tetrahedral fields, respectively, are:

Accepted Answer

$-0.4 \Delta_{o}$ and $-0.6 \Delta_{t}$

Answer

$-2.4 \, \Delta_{o}$ and $-0.6 \, \Delta_{t}$

Answer

$-1.6 \Delta_{o}$ and $-0.4 \Delta_{t}$

Answer

$-0.4 \Delta_{o}$ and $-0.27 \Delta_{t}$

Question 3

Consider the following reaction:$ \mathrm{N}_2\mathrm{O}_4(g) \rightleftharpoons 2\,\mathrm{NO}_2(g): \Delta H^0 = +58\,\mathrm{kJ} $For each of the following cases $(a, b)$, the direction in which the equilibrium shifts is:(a) Temperature is decreased.(b) Pressure is increased by adding $\mathrm{N}_2$ at constant $T$.

Accepted Answer

(a) towards reactant, (b) no change

Answer

(a) towards product, (b) towards reactant

Answer

(a) towards reactant, (b) towards product

Answer

(a) towards product, (b) no change

Question 4

The increasing order of the acidity of the $\alpha$-hydrogen of the following compounds is:

Accepted Answer

$\left(\mathrm{D}\right) < \left(\mathrm{C}\right) < \left(\mathrm{A}\right) < \left(\mathrm{B}\right)$

Answer

$\left(\mathrm{B}\right) < \left(\mathrm{C}\right) < \left(\mathrm{A}\right) < \left(\mathrm{D}\right)$

Answer

$\left(\mathrm{A}\right) < \left(\mathrm{C}\right) < \left(\mathrm{D}\right) < \left(\mathrm{B}\right)$

Answer

$\left(\mathrm{C}\right) < \left(\mathrm{A}\right) < \left(\mathrm{B}\right) < \left(\mathrm{D}\right)$

Question 5

A diatomic molecule ${\mathrm{X}}_{2}$ has a body-centred cubic $\left(\mathrm{bcc}\right)$ structure with a cell edge of $300 \mathrm{pm}$. The density of the molecule is $6.17 \mathrm{gcm}^{-3}$. The number of molecules present in $200 \mathrm{g}$ of ${\mathrm{X}}_{2}$ is:
(Avogadro constant $\left({\mathrm{N}}_{\mathrm{A}}\right) = 6 \times 10^{23} \, \mathrm{mol}^{-1}$)

Accepted Answer

$4 \mathrm{N}_{\mathrm{A}}$

Answer

$40  \mathrm{N}_{\mathrm{A}}$

Answer

$8 \mathrm{N}_{\mathrm{A}}$

Answer

$2 \mathrm{N}_{\mathrm{A}}$