1
JEE Main 2024 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify correct statements from below:

A. The chromate ion is square planar.

B. Dichromates are generally prepared from chromates.

C. The green manganate ion is diamagnetic.

D. Dark green coloured $$\mathrm{K}_2 \mathrm{MnO}_4$$ disproportionates in a neutral or acidic medium to give permanganate.

E. With increasing oxidation number of transition metal, ionic character of the oxides decreases.

Choose the correct answer from the options given below:

A
B, D, E only
B
A, B, C only
C
A, D, E only
D
B, C, D only
2
JEE Main 2024 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The metals that are employed in the battery industries are

A. $$\mathrm{Fe}$$

B. $$\mathrm{Mn}$$

C. $$\mathrm{Ni}$$

D. $$\mathrm{Cr}$$

E. $$\mathrm{Cd}$$

Choose the correct answer from the options given below:

A
A, B, C, D and E
B
A, B, C and D only
C
B, D and E only
D
B, C and E only
3
JEE Main 2024 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The orange colour of $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ and purple colour of $$\mathrm{KMnO}_4$$ is due to

A
Charge transfer transition in both.
B
$$\mathrm{d} \rightarrow \mathrm{d}$$ transitions in $$\mathrm{KMnO}_4$$ and charge transfer transitions in $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$.
C
$$\mathrm{d} \rightarrow \mathrm{d}$$ transitions in both
D
$$\mathrm{d} \rightarrow \mathrm{d}$$ transitions in $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ and charge transfer transitions in $$\mathrm{KMnO}_4$$.
4
JEE Main 2024 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Diamagnetic Lanthanoid ions are :

A
$$\mathrm{La}^{3+} \& \mathrm{~Ce}^{4+}$$
B
$$\mathrm{Nd}^{3+} \& \mathrm{~Ce}^{4+}$$
C
$$\mathrm{Lu}^{3+} \& \mathrm{~Eu}^{3+}$$
D
$$\mathrm{Nd}^{3+} \& \mathrm{~Eu}^{3+}$$
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