1
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The radical which mainly causes ozone depletion in the presence of UV radiations is :

A
$$\mathrm{NO}^\cdot$$
B
$$\mathrm{CH}_{3} ^\cdot$$
C
$$\dot{\mathrm{Cl}}$$
D
$$\dot{\mathrm{O}} \mathrm{H}$$
2
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one ?

A
$$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{2-}$$
B
$$\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}$$
C
$$\mathrm{NO} \rightarrow \mathrm{NO}^{+}$$
D
$$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}$$
3
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following statements are not correct?

A. The electron gain enthalpy of $$\mathrm{F}$$ is more negative than that of $$\mathrm{Cl}$$.

B. Ionization enthalpy decreases in a group of periodic table.

C. The electronegativity of an atom depends upon the atoms bonded to it.

D. $$\mathrm{Al}_{2} \mathrm{O}_{3}$$ and $$\mathrm{NO}$$ are examples of amphoteric oxides.

Choose the most appropriate answer from the options given below :

A
A, B, C and D
B
A, C and D Only
C
A, B and D Only
D
B and D Only
4
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In the following reaction 'X' is

JEE Main 2023 (Online) 13th April Morning Shift Chemistry - Haloalkanes and Haloarenes Question 23 English

A
$$\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{CH}_{2} \mathrm{Cl}$$
B
JEE Main 2023 (Online) 13th April Morning Shift Chemistry - Haloalkanes and Haloarenes Question 23 English Option 2
C
$$\mathrm{Cl}-\mathrm{CH}_{2}-\left(\mathrm{CH}_{2}\right)_{4}-\mathrm{CH}_{2}-\mathrm{Cl}$$
D
JEE Main 2023 (Online) 13th April Morning Shift Chemistry - Haloalkanes and Haloarenes Question 23 English Option 4
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