1
JEE Main 2024 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$\mathrm{KMnO}_4$$ decomposes on heating at $$513 \mathrm{~K}$$ to form $$\mathrm{O}_2$$ along with

A
$$\mathrm{K}_2 \mathrm{MnO}_4 ~\& \mathrm{~Mn}$$
B
$$\mathrm{MnO}_2 ~\& \mathrm{~K}_2 \mathrm{O}_2$$
C
$$\mathrm{K}_2 \mathrm{MnO}_4 ~\& \mathrm{~MnO}_2$$
D
$$\mathrm{Mn} ~\& \mathrm{~KO}_2$$
2
JEE Main 2024 (Online) 27th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement (I) : In the Lanthanoids, the formation $$\mathrm{Ce}^{+4}$$ is favoured by its noble gas configuration.

Statement (II) : $$\mathrm{Ce}^{+4}$$ is a strong oxidant reverting to the common +3 state.

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

A
Both Statement I and Statement II are false
B
Statement I is true but Statement II is 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) 27th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Choose the correct option having all the elements with $$\mathrm{d}^{10}$$ electronic configuration from the following :

A
$${ }^{46} \mathrm{Pd},{ }^{28} \mathrm{Ni},{ }^{26} \mathrm{Fe},{ }^{24} \mathrm{Cr}$$
B
$${ }^{29} \mathrm{Cu},{ }^{30} \mathrm{Zn},{ }^{48} \mathrm{Cd},{ }^{47} \mathrm{Ag}$$
C
$${ }^{27} \mathrm{Co},{ }^{28} \mathrm{Ni},{ }^{26} \mathrm{Fe},{ }^{24} \mathrm{Cr}$$
D
$${ }^{28} \mathrm{Ni},{ }^{24} \mathrm{Cr},{ }^{26} \mathrm{Fe},{ }^{29} \mathrm{Cu}$$
4
JEE Main 2024 (Online) 27th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following electronic configuration would be associated with the highest magnetic moment?

A
$$[\mathrm{Ar}] 3 \mathrm{~d}^7$$
B
$$[\mathrm{Ar}] 3 \mathrm{~d}^8$$
C
$$[\mathrm{Ar}] 3 \mathrm{~d}^3$$
D
$$[\mathrm{Ar}] 3 \mathrm{~d}^6$$
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