JEE MAIN - Chemistry (2023 - 11th April Morning Shift)

1

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Haloalkanes and Haloarenes Question 43 English

Find out the correct statement from the options given below for the above 2 reactions.

Answer
(A)
Reaction (I) is of $$1^{\text {st }}$$ order and reaction (II) is of $$2^{\text {nd }}$$ order
2

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 49 English

'A' and 'B' in the above reactions are:

Answer
(B)
JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 49 English Option 2
3
The complex that dissolves in water is :
Answer
(D)
$$\left[\mathrm{Fe}_{3}(\mathrm{OH})_{2}(\mathrm{OAc})_{6}\right] \mathrm{Cl}$$
4

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface.

Reason R : When the photon of any energy strikes an electron in the atom, transfer of energy from the photon to the electron takes place.

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

Answer
(C)
A is correct but R is not correct
5

Match List - I with List - II:

List - I Species List - II Geometry/Shape
A. $$\mathrm{H_3O^+}$$ I. Tetrahedral
B. Acetylide anion II. Linear
C. $$\mathrm{NH_4^+}$$ III. Pyramidal
D. $$\mathrm{ClO_2^-}$$ IV. Bent

Choose the correct answer from the options given below:

Answer
(B)
A-III, B-II, C-I, D-IV
6
For elements $$\mathrm{B}, \mathrm{C}, \mathrm{N}, \mathrm{Li}, \mathrm{Be}, \mathrm{O}$$ and $$\mathrm{F}$$, the correct order of first ionization enthalpy is
Answer
(D)
$$\mathrm{Li}<\mathrm{B}<\mathrm{Be}<\mathrm{C}<\mathrm{O}<\mathrm{N}<\mathrm{F}$$
7
$$25 \mathrm{~mL}$$ of silver nitrate solution (1M) is added dropwise to $$25 \mathrm{~mL}$$ of potassium iodide $$(1.05 \mathrm{M})$$ solution. The ion(s) present in very small quantity in the solution is/are :
Answer
(C)
$$\mathrm{Ag^+}$$ and $$\mathrm{I^-}$$ both
8
When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral $$\mathrm{FeCl}_{3}$$, it gave deep red colour which disppeared on boiling and a brown red ppt was formed. The mixture contains :
Answer
(B)
$$\mathrm{CH}_{3} \mathrm{COO}^{-} \& ~\mathrm{NO}_{3}^{-}$$
9

Thin layer chromatography of a mixture shows the following observation:

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Basics of Organic Chemistry Question 85 English

The correct order of elution in the silica gel column chromatography is

Answer
(C)
A, C, B
10

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 51 English

'X' is

Answer
(B)
JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Compounds Containing Nitrogen Question 51 English Option 2
11
For compound having the formula $$\mathrm{GaAlCl}_{4}$$, the correct option from the following is :
Answer
(D)
$$\mathrm{Ga}$$ is more electronegative than $$\mathrm{Al}$$ and is present as a cationic part of the salt $$\mathrm{GaAlCl}_{4}$$
12
The set which does not have ambidentate ligand(s) is :
Answer
(B)
$$\mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-}$$, ethylene diammine, $$\mathrm{H}_{2} \mathrm{O}$$
13

L-isomer of tetrose $$\mathrm{X}\left(\mathrm{C}_{4} \mathrm{H}_{8} \mathrm{O}_{4}\right)$$ gives positive Schiff's test and has two chiral carbons. On acetylation, '$$\mathrm{X}$$' yields triacetate. '$$\mathrm{X}$$' also undergoes following reactions

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Biomolecules Question 39 English

'$$\mathrm{X}$$' is

Answer
(D)
JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Biomolecules Question 39 English Option 4
14
Which of the following complex has a possibility to exist as meridional isomer?
Answer
(D)
$$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]$$
15

Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Alcohols, Phenols and Ethers Question 35 English

Answer
(C)
c, a, b, d
16
A solution of sugar is obtained by mixing $$200 \mathrm{~g}$$ of its $$25 \%$$ solution and $$500 \mathrm{~g}$$ of its $$40 \%$$ solution (both by mass). The mass percentage of the resulting sugar solution is ___________ (Nearest integer)
Answer
36
17
0.004 M K$$_2$$SO$$_4$$ solution is isotonic with 0.01 M glucose solution. Percentage dissociation of K$$_2$$SO$$_4$$ is ___________ (Nearest integer)
Answer
75
18
The ratio of spin-only magnetic moment values $$\mu_{\text {eff }}\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-} / \mu_{\text {eff }}\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$$ is _________.
Answer
1
19

$$\mathrm{KClO}_{3}+6 \mathrm{FeSO}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{KCl}+3 \mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}+3 \mathrm{H}_{2} \mathrm{O}$$

The above reaction was studied at $$300 \mathrm{~K}$$ by monitoring the concentration of $$\mathrm{FeSO}_{4}$$ in which initial concentration was $$10 \mathrm{M}$$ and after half an hour became 8.8 M. The rate of production of $$\mathrm{Fe}_{2}\left(\mathrm{SO}_{4}\right)_{3}$$ is _________ $$\times 10^{-6} \mathrm{~mol} \mathrm{~L} \mathrm{~s}^{-1}$$ (Nearest integer)

Answer
333
20

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Alcohols, Phenols and Ethers Question 37 English

The number of hyperconjugation structures involved to stabilize carbocation formed in the above reaction is _________.

Answer
7
21

JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Alcohols, Phenols and Ethers Question 36 English

The ratio x/y on completion of the above reaction is __________.

Answer
2
22
A mixture of 1 mole of $$\mathrm{H}_{2} \mathrm{O}$$ and 1 mole of $$\mathrm{CO}$$ is taken in a 10 litre container and heated to $$725 \mathrm{~K}$$. At equilibrium $$40 \%$$ of water by mass reacts with carbon monoxide according to the equation :

$$\mathrm{CO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \rightleftharpoons \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g})$$.

The equilibrium constant $$\mathrm{K}_{\mathrm{c}} \times 10^{2}$$ for the reaction is ____________. (Nearest integer)
Answer
44
23

Solid fuel used in rocket is a mixture of $$\mathrm{Fe}_{2} \mathrm{O}_{3}$$ and $$\mathrm{Al}$$ (in ratio 1 : 2). The heat evolved $$(\mathrm{kJ})$$ per gram of the mixture is ____________. (Nearest integer)

Given: $$\Delta \mathrm{H}_{\mathrm{f}}^{\theta}\left(\mathrm{Al}_{2} \mathrm{O}_{3}\right)=-1700 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

$$\Delta \mathrm{H}_{\mathrm{f}}^{\theta}\left(\mathrm{Fe}_{2} \mathrm{O}_{3}\right)=-840 \mathrm{~kJ} \mathrm{~mol}^{-1}$$

Molar mass of Fe, Al and O are 56, 27 and 16 g mol$$^{-1}$$ respectively.

Answer
4
24
In an electrochemical reaction of lead, at standard temperature, if $$\mathrm{E}^{0}\left(\mathrm{~Pb}^{2+} / \mathrm{Pb}\right)=\mathrm{m}$$ Volt and $$\mathrm{E}^{0}\left(\mathrm{~Pb}^{4+} / \mathrm{Pb}\right)=\mathrm{n}$$ Volt, then the value of $$\mathrm{E}^{0}\left(\mathrm{~Pb}^{2+} / \mathrm{Pb}^{4+}\right)$$ is given by $$\mathrm{m-x n}$$. The value of $$\mathrm{x}$$ is ___________. (Nearest integer)
Answer
2