JEE Main 2021 Question Paper (18-Mar-2021) (Shift 2)

Question 1

The oxidation states of nitrogen in $\mathrm{NO}, \mathrm{NO}_2, \mathrm{N}_2\mathrm{O}$ and $\mathrm{NO}_3^{-}$ are in the order of :

Accepted Answer

$\mathrm{NO}_3^- > \mathrm{NO}_2 > \mathrm{NO} > \mathrm{N}_2\mathrm{O}$

Answer

$\mathrm{NO}_2 > \mathrm{NO}_3^- > \mathrm{NO} > \mathrm{N}_2\mathrm{O}$

Answer

$\mathrm{N}_2\mathrm{O} > \mathrm{NO}_2 > \mathrm{NO} > \mathrm{NO}_3^{-}$

Answer

$ \mathrm{NO} > \mathrm{NO}_{2} > \mathrm{N}_{2}\mathrm{O} > \mathrm{NO}_{3}^{-} $

Question 2

In basic medium, $\mathrm{H}_{2}\mathrm{O}_{2}$ exhibits which of the following reactions? (A) $\mathrm{Mn}^{2+} \to \mathrm{Mn}^{4+}$ (B) $\mathrm{I}_{2} \to \mathrm{I}^{-}$ (C) $\mathrm{PbS} \to \mathrm{PbSO}_{4}$ Choose the most appropriate answer from the options given below :

Accepted Answer

(A), (B) only

Answer

(A), (C) only

Answer

(A) only

Answer

(B) only

Question 3

In the reaction of hypobromite with amide, the carbonyl carbon is lost as:

Accepted Answer

$\mathrm{CO}_{3}^{2-}$

Answer

$\mathrm{HCO}_{3}^{-}$

Answer

$\mathrm{CO}_{2}$

Answer

$\mathrm{CO}$

Question 4

The oxide that shows magnetic property is:

Accepted Answer

$\mathrm{Mn}_3\mathrm{O}_4$

Answer

$\mathrm{SiO}_{2}$

Answer

$\mathrm{Na}_{2}\mathrm{O}$

Answer

$\mathrm{MgO}$

Question 5

Main products formed during a reaction of $1$-methoxy naphthalene with hydroiodic acid are:

Accepted Answer

and $\mathrm{CH}_3\mathrm{I}$

Answer

and $\mathrm{CH}_3\mathrm{OH}$

Answer

and $\mathrm{CH}_3\mathrm{OH}$