JEE Main 2021 Question Paper (27-Jul-2021) (Shift 2)

Question 1

Which one of the following set of elements can be detected using sodium fusion extract?

Accepted Answer

Sulphur, Nitrogen, Phosphorus, Halogens

Answer

Phosphorus, Oxygen, Nitrogen, Halogens

Answer

Nitrogen, Phosphorus, Carbon, Sulphur

Answer

Halogens, Nitrogen, Oxygen, Sulphur

Question 2

Consider the above reaction, the major product $\mathrm{P}$ formed is:

Accepted Answer

""

Answer

Answer

Answer

Question 3

The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is:

Accepted Answer

$2 	ext{ and } 1$

Answer

$1 	ext{ and } 1$

Answer

$3 	ext{ and } 1$

Answer

$2 	ext{ and } 2$

Question 4

Match List - I with List II : List-I List-II a Li i photoelectric cell b Na ii absorbent of $\mathrm{CO}_{2}$ c K iii coolant in fast breeder nuclear reactor d Cs iv treatment of cancer v bearings for motor engines Choose the correct answer from the options given below:

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 5

Given below are two statements: one is labelled as Assertion $\mathrm{A}$ and the other is labelled as Reason $\mathrm{R}$. Assertion $\mathrm{A}$: ${\mathrm{SO}}_{2}(\mathrm{g})$ is adsorbed to a large extent than ${\mathrm{H}}_{2}(\mathrm{g})$ on activated charcoal. Reason $\mathrm{R}$: ${\mathrm{SO}}_{2}(\mathrm{g})$ has a higher critical temperature than ${\mathrm{H}}_{2}(\mathrm{g})$. In the light of the above statements, choose the most appropriate answer from the options given below.

Accepted Answer

Both $\mathrm{A}$ and $\mathrm{R}$ are correct and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$.

Answer

Both $ \mathrm{A}$ and $ \mathrm{R}$ are correct but $ \mathrm{R}$ is not the correct explanation for $ \mathrm{A}$.

Answer

$\mathrm{A}$ is not correct but $\mathrm{R}$ is correct.

Answer

$\mathrm{A}$ is correct but $\mathrm{R}$ is not correct.

	List-I		List-II
a	Li	i	photoelectric cell
b	Na	ii	absorbent of $\mathrm{CO}_{2}$
c	K	iii	coolant in fast breeder nuclear reactor
d	Cs	iv	treatment of cancer
		v	bearings for motor engines