JEE Main 2021 Question Paper (17-Mar-2021) (Shift 2)

Question 1

Fructose is an example of:

Accepted Answer

Ketohexose

Answer

Pyranose

Answer

Aldohexose

Answer

Heptose

Question 2

The set of elements that differ in mutual relationship from those of the other sets is:

Accepted Answer

$ \mathrm{Li} - \mathrm{Na} $

Answer

$ \mathrm{Li} - \mathrm{Mg} $

Answer

$\mathrm{B} - \mathrm{Si}$

Answer

$ \mathrm{Be} - \mathrm{Al} $

Question 3

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are:

Accepted Answer

$-\mathrm{SO}_3\mathrm{H}$ and $-\mathrm{NH}_2$

Answer

$-\mathrm{SO}_3\mathrm{H}$ and $-\mathrm{COOH}$

Answer

$ -\mathrm{NH}_{2} 	ext{ and } -\mathrm{COOH} $

Answer

$ -\mathrm{NH}_{2} 	ext{ and } -\mathrm{SO}_{3}\mathrm{H} $

Question 4

Match List-I and List-II : List-I List-IIaHaematitei${\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$bBauxiteii${\mathrm{Al}}_{2}{\mathrm{O}}_{3} \cdot \mathrm{xH}_{2}\mathrm{O}$cMagnetiteiii${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$dMalachiteiv${\mathrm{CuCO}}_{3} \cdot \mathrm{Cu}(\mathrm{OH})_{2}$Choose the correct answer from the options given below :

Accepted Answer

$(\mathrm{a}) - (\mathrm{ii}), \quad (\mathrm{b}) - (\mathrm{i}), \quad (\mathrm{c}) - (\mathrm{iv}), \quad (\mathrm{d}) - (\mathrm{iii})$

Answer

$\quad (\mathrm{a})-(\mathrm{ii}), \quad (\mathrm{b})-(\mathrm{iii}), \quad (\mathrm{c})-(\mathrm{i}), \quad (\mathrm{d})-(\mathrm{iv})$

Answer

$\quad (\mathrm{a}) - (\mathrm{iv}), \quad (\mathrm{b}) - (\mathrm{i}), \quad (\mathrm{c}) - (\mathrm{ii}), \quad (\mathrm{d}) - (\mathrm{iii})$\end{div>

Answer

$\quad (\mathrm{a}) - (\mathrm{i}), \quad (\mathrm{b}) - (\mathrm{iii}), \quad (\mathrm{c}) - (\mathrm{ii}), \quad (\mathrm{d}) - (\mathrm{iv})$

Question 5

The correct pair(s) of the ambident nucleophiles is (are): (A) $\mathrm{AgCN}/\mathrm{KCN}$ (B) $\mathrm{RCOOAg}/\mathrm{RCOOK}$ (C) $\mathrm{AgNO}_2/\mathrm{KNO}_2$ (D) $\mathrm{AgI}/\mathrm{KI}$

Accepted Answer

(A) and (C) only

Answer

(B) and (C) only

Answer

(A) only

Answer

(B) only

	List-I		List-II
a	Haematite	i	${\mathrm{Fe}}_{2}{\mathrm{O}}_{3}$
b	Bauxite	ii	${\mathrm{Al}}_{2}{\mathrm{O}}_{3} \cdot \mathrm{xH}_{2}\mathrm{O}$
c	Magnetite	iii	${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$
d	Malachite	iv	${\mathrm{CuCO}}_{3} \cdot \mathrm{Cu}(\mathrm{OH})_{2}$