1
JEE Main 2024 (Online) 9th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The electronic configuration of $$\mathrm{Cu}(\mathrm{II})$$ is $$3 \mathrm{~d}^9$$ whereas that of $$\mathrm{Cu}(\mathrm{I})$$ is $$3 \mathrm{~d}^{10}$$. Which of the following is correct?

A
$$\mathrm{Cu}(\mathrm{II})$$ is more stable
B
$$\mathrm{Cu}$$ (II) is less stable
C
$$\mathrm{Cu}(\mathrm{I})$$ and $$\mathrm{Cu}(\mathrm{II})$$ are equally stable
D
Stability of $$\mathrm{Cu}(\mathrm{I})$$ and $$\mathrm{Cu}(\mathrm{II})$$ depends on nature of copper salts
2
JEE Main 2024 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Iron (III) catalyses the reaction between iodide and persulphate ions, in which

A. $$\mathrm{Fe}^{3+}$$ oxidises the iodide ion

B. $$\mathrm{Fe}^{3+}$$ oxidises the persulphate ion

C. $$\mathrm{Fe}^{2+}$$ reduces the iodide ion

D. $$\mathrm{Fe}^{2+}$$ reduces the persulphate ion

Choose the most appropriate answer from the options given below:

A
B and C only
B
A only
C
A and D only
D
B only
3
JEE Main 2024 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Arrange the following elements in the increasing order of number of unpaired electrons in it.

(A) $$\mathrm{Sc}$$

(B) $$\mathrm{Cr}$$

(C) $$\mathrm{V}$$

(D) $$\mathrm{Ti}$$

(E) $$\mathrm{Mn}$$

Choose the correct answer from the options given below :

A
$$ (\mathrm{A})<(\mathrm{D})<(\mathrm{C})<(\mathrm{B})<(\mathrm{E}) $$
B
$$ (\mathrm{A})<(\mathrm{D})<(\mathrm{C})<(\mathrm{E})<(\mathrm{B}) $$
C
$$ (\mathrm{B})<(\mathrm{C})<(\mathrm{D})<(\mathrm{E})<(\mathrm{A}) $$
D
$$ (\mathrm{C})<(\mathrm{E})<(\mathrm{B})<(\mathrm{A})<(\mathrm{D}) $$
4
JEE Main 2024 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The number of element from the following that do not belong to lanthanoids is $$\mathrm{Eu}, \mathrm{Cm}, \mathrm{Er}, \mathrm{Tb}, \mathrm{Yb}$$ and $$\mathrm{Lu}$$

A
3
B
1
C
4
D
5
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