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

Which of the following statements are correct about $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ ?

A. They exhibit high enthalpy of atomization as the d-subshell is full.

B. $$\mathrm{Zn}$$ and $$\mathrm{Cd}$$ do not show variable oxidation state while $$\mathrm{Hg}$$ shows $$+\mathrm{I}$$ and $$+\mathrm{II}$$.

C. Compounds of $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ are paramagnetic in nature.

D. $$\mathrm{Zn}, \mathrm{Cd}$$ and $$\mathrm{Hg}$$ are called soft metals.

Choose the most appropriate from the options given below:

A
C, D only
B
B, C only
C
A, D only
D
B, D only
2
JEE Main 2024 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct IUPAC name of $$\mathrm{K}_2 \mathrm{MnO}_4$$ is

A
Potassium tetraoxidomanganate (VI)
B
Dipotassium tetraoxidomanganate (VII)
C
Potassium tetraoxopermanganate (VI)
D
Potassium tetraoxidomanganese (VI)
3
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
$$\mathrm{Mn} ~\& \mathrm{~KO}_2$$
4
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
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