JEE MAIN - Chemistry (2023 - 6th April Morning Shift)

1

Given below are two statements, one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$.

Assertion A: The spin only magnetic moment value for $$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$$ is $$1.74 \mathrm{BM}$$, whereas for $$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$$ is $$5.92 \mathrm{BM}$$.

Reason $$\mathbf{R}$$ : In both complexes, $$\mathrm{Fe}$$ is present in +3 oxidation state.

In the light of the above statements, choose the correct answer from the options given below:

Answer
(D)
Both A and R are true but R is NOT the correct explanation of A
2
The standard electrode potential of $$\mathrm{M}^{+} / \mathrm{M}$$ in aqueous solution does not depend on
Answer
(C)
Ionisation of a solid metal atom
3

For the reaction

JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Haloalkanes and Haloarenes Question 37 English

The correct statement is

Answer
(D)
The transition state formed in the above reaction is less polar than the localised anion.
4

The major products A and B from the following reactions are:

JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 44 English

Answer
(B)
JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 44 English Option 2
5

Which of the following options are correct for the reaction

$$2\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rightarrow 2 \mathrm{Au}(\mathrm{s})+\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]^{2-}(\mathrm{aq})$$

A. Redox reaction

B. Displacement reaction

C. Decomposition reaction

D. Combination reaction

Choose the correct answer from the options given below:

Answer
(A)
A and B only
6
For a concentrated solution of a weak electrolyte ($$\mathrm{K}_{\text {eq }}=$$ equilibrium constant) $$\mathrm{A}_{2} \mathrm{B}_{3}$$ of concentration '$$c$$', the degree of dissociation '$$\alpha$$' is :
Answer
(B)
$$\left(\frac{K_{e q}}{108 c^{4}}\right)^{\frac{1}{5}}$$
7

Match List I with List II

LIST I
Oxide
LIST II
Type of bond
A. $$\mathrm{N_2O_4}$$ I. 1 N = O bond
B. $$\mathrm{NO_2}$$ II. 1 N $$-$$ O $$-$$ N bond
C. $$\mathrm{N_2O_5}$$ III. 1 N $$-$$ N bond
D. $$\mathrm{N_2O}$$ IV. 1 N=N / N $$\equiv$$ N bond

Choose the correct answer from the options given below:

Answer
(B)
A-III, B-I, C-II, D-IV
8
The difference between electron gain enthalpies will be maximum between :
Answer
(B)
Ne and Cl
9

The major product formed in the following reaction is

JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 43 English

Answer
(D)
JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 43 English Option 4
10

Match List I with List II

LIST I
Enzymatic reaction
LIST II
Enzyme
A. Sucrose $$\to$$ Glocuse and Fructose I. Zymase
B. Glucose $$\to$$ ethyl alcohol and CO$$_2$$ II. Pepsin
C. Starch $$\to$$ Maltose III. Invertase
D. Proteins $$\to$$ Amino acids IV. Diastase

Choose the correct answer from the options given below:

Answer
(B)
A-III, B-I, C-IV, D-II
11

JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 45 English

Compound $$\mathrm{P}$$ is neutral, $$\mathrm{Q}$$ gives effervescence with $$\mathrm{NaHCO}_{3}$$ while $$\mathrm{R}$$ reacts with Hinsbergs reagent to give solid soluble in $$\mathrm{NaOH}$$. Compound $$\mathrm{P}$$ is

Answer
(B)
JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 45 English Option 2
12
Strong reducing and oxidizing agents among the following, respectively, are :
Answer
(B)
$$\mathrm{Eu}^{2+}$$ and $$\mathrm{Ce}^{4+}$$
13

Match List I with List II

LIST I
Element detected
LIST II
Reagent used / Product formed
A. Nitrogen I. $$\mathrm{Na_2[Fe(CN)_5NO]}$$
B. Sulphur II. $$\mathrm{AgNO_3}$$
C. Phosphorous III. $$\mathrm{Fe_4[Fe(CN)_6]_3}$$
D. Halogen IV. $$\mathrm{(NH_4)_2MoO_4}$$

Choose the correct answer from the options given below:

Answer
(A)
A-III, B-I, C-IV, D-II
14
Number of bromo derivatives obtained on treating ethane with excess of $$\mathrm{Br}_{2}$$ in diffused sunlight is ___________
Answer
9
15

The wavelength of an electron of kinetic energy $$4.50\times10^{-29}$$ J is _________ $$\times 10^{-5}$$ m. (Nearest integer)

Given : mass of electron is $$9\times10^{-31}$$ kg, h $$=6.6\times10^{-34}$$ J s

Answer
7
16

The number of species from the following which have square pyramidal structure is _________

$$\mathrm{PF}_{5}, \mathrm{BrF}_{4}^{-}, \mathrm{IF}_{5}, \mathrm{BrF}_{5}, \mathrm{XeOF}_{4}, \mathrm{ICl}_{4}^{-}$$

Answer
3
17

Consider the graph of Gibbs free energy G vs Extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is _________

JEE Main 2023 (Online) 6th April Morning Shift Chemistry - Thermodynamics Question 41 English

A. Reaction is spontaneous at (a) and (b)

B. Reaction is at equilibrium at point (b) and non-spontaneous at point (c)

C. Reaction is spontaneous at (a) and non-spontaneous at (c)

D. Reaction is non-spontaneous at (a) and (b)

Answer
2
18

Mass of Urea $$\left(\mathrm{NH}_{2} \mathrm{CONH}_{2}\right)$$ required to be dissolved in $$1000 \mathrm{~g}$$ of water in order to reduce the vapour pressure of water by $$25 \%$$ is _________ g. (Nearest integer)

Given: Molar mass of N, C, O and H are $$14,12,16$$ and $$1 \mathrm{~g} \mathrm{~mol}^{-1}$$ respectively

Answer
1111
19

The value of $$\log \mathrm{K}$$ for the reaction $$\mathrm{A} \rightleftharpoons \mathrm{B}$$ at $$298 \mathrm{~K}$$ is ___________. (Nearest integer)

Given: $$\Delta \mathrm{H}^{\circ}=-54.07 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

$$\Delta \mathrm{S}^{\circ}=10 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$$

(Take $$2.303 \times 8.314 \times 298=5705$$ )

Answer
10
20

Number of ambidentate ligands in a representative metal complex $$\left[\mathrm{M}(\mathrm{en})(\mathrm{SCN})_{4}\right]$$ is ___________.

[en = ethylenediamine]

Answer
4
21
If 5 moles of $$\mathrm{BaCl}_{2}$$ is mixed with 2 moles of $$\mathrm{Na}_{3} \mathrm{PO}_{4}$$, the maximum number of moles of $$\mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}$$ formed is ___________ (Nearest integer)
Answer
1
22
In ammonium - phosphomolybdate, the oxidation state of Mo is + ___________
Answer
6