1
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the homoleptic complexes with odd number of $d$ electrons in the central metal :

(A) $\left[\mathrm{FeO}_4\right]^{2-}$

(B) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$

(C) $\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-}$

(D) $\left[\mathrm{CoCl}_4\right]^{2-}$

(E) $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{~F}_3\right]$

Choose the correct answer from the options given below :

A

(C) and (E) only

B

(A), (B) and (D) only

C

(B) and (D) only

D

(A), (C) and (E) only

2
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II :

List - I (Applications) List - II (Batteries/Cell)
(A) Transistors (I) Anode - Zn/Hg; Cathode - HgO + C
(B) Hearing aids (II) Hydrogen fuel cell
(C) Inverters (III) Anode - Zn; Cathode - Carbon
(D) Apollo space ship (IV) Anode - Pb; Cathode - Pb | PbO2

Choose the correct answer from the options given below :

A

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

B

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

C

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

D

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

3
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one of the following, with HBr will give a phenol?

A
JEE Main 2025 (Online) 29th January Evening Shift Chemistry - Alcohols, Phenols and Ethers Question 7 English Option 1
B
JEE Main 2025 (Online) 29th January Evening Shift Chemistry - Alcohols, Phenols and Ethers Question 7 English Option 2
C
JEE Main 2025 (Online) 29th January Evening Shift Chemistry - Alcohols, Phenols and Ethers Question 7 English Option 3
D
JEE Main 2025 (Online) 29th January Evening Shift Chemistry - Alcohols, Phenols and Ethers Question 7 English Option 4
4
JEE Main 2025 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The calculated spin-only magnetic moments of $K_3[Fe(OH)_6]$ and $K_4[Fe(OH)_6]$ respectively are :

A

4.90 and 4.90 B.M.

B

4.90 and 5.92 B.M.

C

5.92 and 4.90 B.M.

D

3.87 and 4.90 B.M.

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