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

The electronic configuration of Einsteinium is :

(Given atomic number of Einsteinium $$=99$$)

A
$$[\mathrm{Rn}] 5 \mathrm{f}^{13} 6 \mathrm{~d}^{\circ} 7 \mathrm{~s}^2$$
B
$$[\mathrm{Rn}] 5 \mathrm{f}^{12} 6 \mathrm{~d}^{\circ} 7 \mathrm{~s}^2$$
C
$$[\mathrm{Rn}] 5 \mathrm{f}^{11} 6 \mathrm{~d}^{\circ} 7 \mathrm{~s}^2$$
D
$$[\mathrm{Rn}] 5 \mathrm{f}^{10} 6 \mathrm{~d}^{\circ} 7 \mathrm{~s}^2$$
2
JEE Main 2024 (Online) 9th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Give below are two statements :

Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements.

Statement II : Copper can not liberate hydrogen from weak acids.

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

A
Statement I is true but Statement II is false
B
Both Statement I and Statement II are false
C
Both Statement I and Statement II are true
D
Statement I is false but Statement II is true
3
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
4
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
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