
In dark, which of the following reacts with hydrogen?
A. ${{F}_{2}}$
B. $C{{l}_{2}}$
C. ${{I}_{2}}$
D. $B{{r}_{2}}$
Answer
163.8k+ views
Hint: As we move down a group in halogen the reactivity of halogen elements decreases. Fluorine is most reactive among the halogens. The most reactive ones react even in the dark.
Complete Step by Step Answer:
The reactivity of halogens decreases as we move from fluorine to iodine. Fluorine has the smallest size thus it possesses strong repulsion between the electrons of two fluorine atoms and has the weakest bond. Thus fluorine is highly reactive and can easily react in dark with hydrogen gas.
Fluorine reacts with hydrogen gas in dark condition to form an acid of fluorine that is hydrogen fluoride. The reaction is given as follows:
${{F}_{2}}+{{H}_{2}}\to 2HF$
Thus in this reaction one mole of fluorine gas reacts with one mole of hydrogen gas to produce two moles of hydrogen fluoride as a product. Thus we can write that in dark fluorine or gas reacts with hydrogen gas.
Thus the correct option is A.
Note: Fluorine is the most electronegative element among halogens. It has the lowest boiling and melting point among halogens. It has the symbol of $F$.
Complete Step by Step Answer:
The reactivity of halogens decreases as we move from fluorine to iodine. Fluorine has the smallest size thus it possesses strong repulsion between the electrons of two fluorine atoms and has the weakest bond. Thus fluorine is highly reactive and can easily react in dark with hydrogen gas.
Fluorine reacts with hydrogen gas in dark condition to form an acid of fluorine that is hydrogen fluoride. The reaction is given as follows:
${{F}_{2}}+{{H}_{2}}\to 2HF$
Thus in this reaction one mole of fluorine gas reacts with one mole of hydrogen gas to produce two moles of hydrogen fluoride as a product. Thus we can write that in dark fluorine or gas reacts with hydrogen gas.
Thus the correct option is A.
Note: Fluorine is the most electronegative element among halogens. It has the lowest boiling and melting point among halogens. It has the symbol of $F$.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main 2025 Session 2: Exam Date, Admit Card, Syllabus, & More

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Trending doubts
Atomic Structure - Electrons, Protons, Neutrons and Atomic Models

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

Types of Solutions

Degree of Dissociation and Its Formula With Solved Example for JEE

Classification of Drugs

Instantaneous Velocity - Formula based Examples for JEE

Other Pages
Alcohol Phenol and Ether Class 12 Notes: CBSE Chemistry Chapter 7

NCERT Solutions for Class 12 Chemistry In Hindi Chapter 3 Electrochemistry Hindi Medium

JEE Advanced 2025 Notes

Coordination Compounds Class 12 Notes: CBSE Chemistry Chapter 5

JEE Main Chemistry Question Paper with Answer Keys and Solutions

NCERT Solutions for Class 12 Chemistry In Hindi Chapter 10 Haloalkanes and Haloarenes In Hindi Mediem
