JEE Main 2023 Chemistry Question Paper Jan 24 Shift 2- Download PDF

Which one amongst the following are good oxidizing agents?
A. \( Sm^{2+} \) B. \( Ce^{2+} \)
C. \( Ce^{4+} \) D. \( Tb^{4+} \)

Choose the most appropriate answer from the options given below:

• (1) C only
• (2) D only
• (3) A and B only
• (4) C and D only

What is the number of unpaired electrons(s) in the highest occupied molecular orbital of the following species: \( N_2, N_2^+, O_2, O_2^? \)

• (1) 0, 1, 2, 1
• (2) 2, 1, 2, 1
• (3) 1, 0, 1, 0
• (4) 2, 1, 0, 1

Which of the following cannot be explained by crystal field theory?

(1) The order of spectrochemical series

(2) Magnetic properties of transition metal complexes

(3) Colour of metal complexes

(4) Stability of metal complexes

• (1) The order of spectrochemical series
• (2) Magnetic properties of transition metal complexes
• (3) Colour of metal complexes
• (4) Stability of metal complexes

A student has studied the decomposition of a gas \( AB_3 \) at 25°C. He obtained the following data. \[ p (mm Hg) 50, 100, 200, 400 \quad Relative t_{1/2} \quad 4, 2, 1, 0.5 \]
The order of the reaction is:

• (1) 0.5
• (2) 2
• (3) 1
• (4) 0 (zero)

The number of s-electrons present in an ion with 55 protons in its unipositive state is:

• (1) 8
• (2) 9
• (3) 12
• (4) 10

In which of the following reactions the hydrogen peroxide acts as a reducing agent?

• (1) \( PbS + H_2O_2 \rightarrow PbSO_4 + 4H_2 \)
• (2) \( Fe_2O_3 + H_2O_2 \rightarrow 2FeO_2 + 2H_2O \)
• (3) \( HCl + H_2O_2 \rightarrow HOCl + Cl_2 \)
• (4) \( MnO_2 + H_2O_2 \rightarrow Mn^{2+} + 2OH^- \)

The metal which is extracted by oxidation and subsequent reduction from its ore is:

• (1) Al
• (2) Ag
• (3) Cu
• (4) Fe

Given below are two statements: Statement I and Statement II.

Statement I: \( H_2N- C_6H_5 \) under Clemensen reduction conditions will give \( HOOC-C_6H_5 \).
Statement II: \( Cl- C_6H_5 \) under Wolff-Kishner reduction condition will give \( HOOC-C_6H_5 \).

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

• (1) Statement I is false but Statement II is true
• (2) Both Statement I and Statement II are false
• (3) Statement I is true but Statement II is false
• (4) Both Statement I and Statement II are true

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

Assertion A: Beryllium has less negative value of reduction potential compared to the other alkaline earth metals.

Reason R: Beryllium has large hydration energy due to small size of \( Be^{2+} \) but relatively large value of atomization enthalpy.

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

• (1) A is correct but R is not correct
• (2) Both A and R are correct and R is the correct explanation of A
• (3) A is not correct but R is correct
• (4) Both A and R are correct but R is not the correct explanation of A

Match List I with List II





Choose the correct answer from the options given below:

• (1) A-I, B-II, C-III, D-IV
• (2) A-IV, B-III, C-II, D-I
• (3) A-I, B-III, C-II, D-IV
• (4) A-II, B-I, C-III, D-IV

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

Assertion A: Benzene is more stable than hypothetical cyclohexatriene.
Reason R: The delocalized \( \pi \)-electron cloud is attracted strongly by nuclei of carbon atoms.

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

• (1) A is true but R is false
• (2) A is false but R is true
• (3) Both A and R are correct but R is NOT the correct explanation of A
• (4) Both A and R are correct and R is the correct explanation of A

Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide.

• (1)
• (2)
• (3)
• (4)

Find out the major products from the following reactions.
\[ B \xrightarrow{H_2O, NaBH_4} A \]
\[ B \xrightarrow{BH_3, THF} A \]
\[ B \xrightarrow{H_2O, OH^-} B \]

• (1) A = Alcohol, B = Aldehyde
• (2) A = Aldehyde, B = Alcohol
• (3) A = Acid, B = Aldehyde
• (4) A = Ketone, B = Acid

Correct statement is:

(1) An average human being consumes more food than air

(2) An average human being consumes nearly 15 times more air than food

(3) An average human being consumes equal amount of food and air

(4) An average human being consumes 100 times more air than food

Given below are two statements:

Statement I: Pure Aniline and other Arylamines are usually colourless.

Statement II: Arylamines get coloured on storage due to atmospheric reduction.

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

• (1) Both Statement I and Statement II are incorrect
• (2) Both Statement I and Statement II are correct
• (3) Statement I is correct but Statement II is incorrect
• (4) Statement I is incorrect but Statement II is correct

Which will undergo deprotonation most readily in basic medium?

• (1) a only
• (2) b only
• (3) a and b
• (4) b and c

Choose the correct colour of the product for the following reaction:

• (1) Yellow
• (2) White
• (3) Red
• (4) Blue

Identify the correct statements about alkali metals.

A. The order of standard reduction potential \( M^+ / M \) for alkali metal ions is Na \(>\) K \(>\) Rb \(>\) Li.

B. \( CsI \) is highly soluble in water.

C. Lithium carbonate is highly stable to heat.

D. Potassium dissolved in concentrated liquid ammonia is blue in colour and paramagnetic.

E. All the alkali metal hydrides are ionic solids.

Choose the correct answer from the options given below:

• (1) A only
• (2) A, B, D only
• (3) C and E only
• (4) A, B and E only

The hybridization and magnetic behaviour of cobalt ion in \( [Co(NH_3)_6]^{3+} \) complex is:

• (1) \( sp^2 \) and diamagnetic
• (2) \( d^3 \) and paramagnetic
• (3) \( d^5 \) and diamagnetic
• (4) \( d^2 s^2 \) and paramagnetic

K_2\text{Cr_2\text{O_7 \text{ paper acidified with dilute H_2\text{SO_4 \text{ turns green when exposed to:

• (1) Carbon dioxide
• (2) Sulphur trioxide
• (3) Hydrogen sulphide
• (4) Sulphur dioxide

The number of statement(s) which are the characteristics of physisorption is____

Sum of \(\pi\)-bonds present in peroxodisulphuric acid and pyrosulphuric acid is:

Maximum number of isomeric monochloro derivatives that can be obtained from 2,2,5,5-tetramethylhexane by chlorination is:

Total number of tripeptides possible by mixing of valine and proline is:

The number of units, which are used to express concentration of solutions from the following is: _____

Mass percent, Mole, Mole fraction, Molarity, ppm, Molarity.

The number of statement(s), which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the following is:

A. Carbon dioxide remains as a gas upto point (b)

B. Liquid carbon dioxide appears at point (c)

C. Liquid and gaseous carbon dioxide coexist between points (b) and (c)

D. As the volume decreases from (b) to (c), the amount of liquid decreases

Let V.P. of pure B be \( P_0 \). When \( X_A = 0.7 \) and \( X_B = 0.3 \), the Total pressure is 350 mm Hg. If \( X_A = 0.2 \) and \( X_B = 0.8 \), the total pressure becomes 410 mm Hg. Calculate the vapor pressure of A and B.

One mole of an ideal monatomic gas is subjected to changes as shown in the graph. The magnitude of the work done (by the system or on the system) is:

If the pKa of lactic acid is 5, then the pH of 0.005 M calcium lactate solution at 25°C is:

Following figure shows the spectrum of an ideal black body at four different temperatures. The number of correct statement(s) from the following is: