JEE Main 2020 Question Paper (06-Sep-2020) (Shift 1)

Question 1

The correct statement with respect to dinitrogen is:

Accepted Answer

It can be used as an inert diluent for reactive chemicals.

Answer

$\mathrm{N}_2$ is paramagnetic in nature.

Answer

It can combine with dioxygen at $25^\circ \mathrm{C}$

Answer

Liquid dinitrogen is not used in cryosurgery.

Question 2

Consider the following reactions:'A' is

Accepted Answer

""

Answer

Answer

Answer

Question 3

The major product obtained from the following reaction is :

Accepted Answer

""

Answer

Answer

Answer

Question 4

A solution of two components containing $n_{1}$ moles of the $1^{	ext{st}}$ component and $n_{2}$ moles of the $2^{	ext{nd}}$ component is prepared. $M_{1}$ and $M_{2}$ are the molecular weights of component 1 and 2 respectively. If $d$ is the density of the solution in $\mathrm{g\,ml}^{-1}$, $C_{2}$ is the molarity and $x_{2}$ is the mole fraction of the $2^{	ext{nd}}$ component, then $C_{2}$ can be expressed as :

Accepted Answer

$ {\mathrm{C}}_{2} = \frac{1000 \, {\mathrm{dx}}_{2}}{{\mathrm{M}}_{1} + {\mathrm{x}}_{2} \left( {\mathrm{M}}_{2} - {\mathrm{M}}_{1} \right)} $

Answer

$ {\mathrm{C}}_{2} = \frac{1000 x_{2}}{ {\mathrm{M}}_{1} + x_{2} \left( {\mathrm{M}}_{2} - {\mathrm{M}}_{1} \right) } $

Answer

$ {\mathrm{C}}_{2} = \frac{{\mathrm{dx}}_{2}}{{\mathrm{M}}_{1} + {\mathrm{x}}_{2} \left( {\mathrm{M}}_{2} - {\mathrm{M}}_{1} \right)} $

Answer

$ {\mathrm{C}}_{2} = \frac{{\mathrm{dx}}_{1}}{{\mathrm{M}}_{2} + {\mathrm{x}}_{2} \left( {\mathrm{M}}_{2} - {\mathrm{M}}_{1} \right)} $

Question 5

The INCORRECT statement is:

Accepted Answer

Brass is an alloy of copper and zinc.

Answer

bronze is an alloy of copper and tin.

Answer

Cast iron is used to manufacture wrought iron.

Answer

German silver is an alloy of zinc, copper, and nickel.