1
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which of these reactions is not a part of breakdown of ozone in stratosphere?

A
$$\mathrm{C{F_2}C{l_2}(g)\buildrel {uv} \over \longrightarrow \mathop C\limits^ \bullet l(g) + \mathop C\limits^ \bullet {F_2}Cl(g)}$$
B
$$\mathrm{C\mathop l\limits^ \bullet (g) + {O_3}(g)\buildrel {} \over \longrightarrow Cl\mathop O\limits^ \bullet (g) + {O_2}(g)}$$
C
$$\mathrm{2Cl\mathop O\limits^ \bullet \buildrel {} \over \longrightarrow Cl{O_2}(g) + C\mathop l\limits^ \bullet (g)}$$
D
$$\mathrm{Cl\mathop O\limits^ \bullet (g) + O(g)\buildrel {} \over \longrightarrow C\mathop l\limits^ \bullet (g) + {O_2}(g)}$$
2
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The statement/s which are true about antagonists from the following is/are:

A. They bind to the receptor site.

B. Get transferred inside the cell for their action.

C. Inhibit the natural communication of the body.

D. Mimic the natural messenger.

Choose the correct answer from the options given below:

A
B only
B
A and B
C
A and C
D
A, C and D
3
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Henry Moseley studied characteristic X-ray spectra of elements. The graph which represents his observation correctly is

Given $$v=$$ frequency of $$\mathrm{X}$$-ray emitted

Z = atomic number

A
JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Structure of Atom Question 15 English Option 1
B
JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Structure of Atom Question 15 English Option 2
C
JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Structure of Atom Question 15 English Option 3
D
JEE Main 2023 (Online) 8th April Evening Shift Chemistry - Structure of Atom Question 15 English Option 4
4
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

In Hall - Heroult process, the following is used for reducing $$\mathrm{Al}_{2} \mathrm{O}_{3}$$ :-

A
Magnesium
B
$$\mathrm{CaF}_{2}$$
C
Graphite
D
$$\mathrm{Na}_{3} \mathrm{AlF}_{6}$$
JEE Main Papers
2023
2021
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12