JEE Main 2025 Question Paper (22-Jan-2025) (Shift 1)

Question 1

A solution of aluminium chloride is electrolysed for $30$ minutes using a current of $2\,A$. The amount of aluminium deposited at the cathode is ________.[$	ext{Given: molar mass of aluminium} = 27\,g\,mol^{-1}$ and $	ext{chlorine} = 35.5\,g\,mol^{-1}$, Faraday constant $= 96500\,C\,mol^{-1}$]

Accepted Answer

$0.336 \quad g$

Answer

$1.660 \quad g$

Answer

$1.007 \quad g$

Answer

$0.441 \quad g$

Question 2

Which of the following statements is not true for radioactive decay?

Accepted Answer

Decay constant increases with increase in temperature

Answer

Amount of radioactive substance remained after three half lives is $ \frac{1}{8} $th of original amount.

Answer

Decay constant does not depend upon temperature.

Answer

Half life is ln 2 times of $\frac{1}{	ext{rate constant}}$

Question 3

How many different stereoisomers are possible for the given molecule?

Accepted Answer

$4$

Answer

$3$

Answer

$1$

Answer

$2$

Question 4

Which of the following electronegativity order is incorrect?

Accepted Answer

$Al < Mg < B < N$

Answer

$Al < Si < C < N$

Answer

$Mg < Be < B < N$

Answer

$ S < CI < O < F $

Question 5

Lanthanoid ions with 4f configuration are:$(A) \quad Eu^{2+} \quad (B) \quad Gd^{3+} \quad (C) \quad Eu^{3+} \quad (D) \quad Tb^{3+} \quad (E) \quad Sm^{2+}$Choose the correct answer from the options given below:

Accepted Answer

(A) and (B) only

Answer

(A) and (D) only

Answer

(B) and (E) only

Answer

(B) and (C) only