JEE Main 2021 Question Paper (16-Mar-2021) (Shift 1)

Question 1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Size of $ \mathrm{Bk}^{3+} $ ion is less than $ \mathrm{Np}^{3+} $ ion. Reason R: The above is a consequence of the lanthanide contraction. In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

A is true but R is false

Answer

A is false but R is true

Answer

Both A and R are true but R is not the correct explanation of A

Answer

Both A and R are true and R is the correct explanation of A.

Question 2

Which among the following pairs of vitamins is stored in our body relatively for a longer duration?

Accepted Answer

Vitamin $ \mathrm{A} $ and $ \mathrm{D} $

Answer

Thiamine and Vitamin $ \mathrm{A}$

Answer

Thiamine and Ascorbic acid

Answer

Ascorbic acid and Vitamin $ \mathrm{D}$

Question 3

Given below are two statements: Statement I: Both $ \mathrm{CaCl}_2 \cdot 6\mathrm{H}_2\mathrm{O} $ and $ \mathrm{MgCl}_2 \cdot 8\mathrm{H}_2\mathrm{O} $ undergo dehydration on heating. Statement II: $ \mathrm{BeO} $ is amphoteric, whereas the oxides of other elements in the same group are acidic. In the light of the above statements, choose the correct answer from the options given below:

Accepted Answer

Both statement I and statement II are false

Answer

Statement I is false but statement II is true

Answer

Both statement I and statement II are true

Answer

Statement I is true but statement II is false.

Question 4

The product "$\mathrm{P}$" in the above reaction is :

Accepted Answer

""

Answer

Answer

Answer

Question 5

Match List-I with List-II : List-I List-II Industrial process Application (a) Haber's process (i) ${\mathrm{NH}}_{3}$ synthesis (b) Ostwald's process (ii) ${\mathrm{HNO}}_{3}$ synthesis (c) Contact process (iii) ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ synthesis (d) Hall-Heroult process (iv) Aluminium extraction Choose the correct answer from the options given below:

Accepted Answer

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

Answer

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

Answer

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

Answer

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

	List-I		List-II
	Industrial process		Application
(a)	Haber's process	(i)	${\mathrm{NH}}_{3}$ synthesis
(b)	Ostwald's process	(ii)	${\mathrm{HNO}}_{3}$ synthesis
(c)	Contact process	(iii)	${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ synthesis
(d)	Hall-Heroult process	(iv)	Aluminium extraction