
A one-litre flask is full of brown bromine vapour. The intensity of brown colour of vapour will not decreases appreciably on adding to the flask some
A. Pieces of marble
B. Animal charcoal powder
C. Carbon tetrachloride
D. Carbon disulphide
Answer
163.5k+ views
Hint: The colour of bromine vapour is brown because the colour of bromine itself is brown (\[B{{r}_{2}}\]). Now the colour of its vapour will not discharge when its bromine vapour does not react with any of the given compounds in the option. Bromine is a non-polar (non-polar covalent) molecule means its dipole moment is zero (because of the symmetrical arrangement of atoms). Always like molecules dissolve in like one so, bromine will dissolve in nonpolar molecules and discharge in colour of bromine will get noticed.
Complete Step by Step Answer:
Carbon disulphide whose molecular formula is \[C{{S}_{_{2}}}\]. Its arrangement is like both sulphide atoms (disulphide) are bonded with carbon opposite to each other. The maximum valence of carbon is four and sulphide valence is two so each two sulphides form one double bond with carbon and completes the valence of carbon and itself also. Now both double bonds will be at a maximum distance to avoid the repulsion factor and that will be at 180 degree. So, on both sides the carbon arrangement of sulphide is similar and thus, the net dipole moment is zero. So, carbon disulphide is non-polar and bromine can dissolve (non-polar), and discharge in colour will appear.
Similarly, carbon tetrachloride is nonpolar because of the symmetrical arrangement of all four chlorine atoms in the space around the carbon. This results in zero net dipole moment and non-polar character of carbon tetrachloride. So, bromine and carbon tetrachloride both are nonpolar and favour solubility with each other. Also, animal charcoal absolves the colour of bromine water and helps to decolorize bromine water.
The pieces of marble (let’s say CaCO3) are ionic and not symmetrical or can say dipole moment is not zero because of this, marbles are somewhere polar due to this bromine vapour will not dissolve in it and thus, discharge of vapour will not take place.
This, the correct option is A.
Note: The animal charcoal is formed with the horn, blood, bones, etc. of animals. All charcoal has the property to absorb colour and also odour from substances (mostly liquid and gases) for purifying purposes. Charcoal is used for pure drinking water, sugar solution, and many others. So, when it is used with bromine water, it absorbs all the colour of bromine, and the brown colour of bromine will disappear.
Complete Step by Step Answer:
Carbon disulphide whose molecular formula is \[C{{S}_{_{2}}}\]. Its arrangement is like both sulphide atoms (disulphide) are bonded with carbon opposite to each other. The maximum valence of carbon is four and sulphide valence is two so each two sulphides form one double bond with carbon and completes the valence of carbon and itself also. Now both double bonds will be at a maximum distance to avoid the repulsion factor and that will be at 180 degree. So, on both sides the carbon arrangement of sulphide is similar and thus, the net dipole moment is zero. So, carbon disulphide is non-polar and bromine can dissolve (non-polar), and discharge in colour will appear.
Similarly, carbon tetrachloride is nonpolar because of the symmetrical arrangement of all four chlorine atoms in the space around the carbon. This results in zero net dipole moment and non-polar character of carbon tetrachloride. So, bromine and carbon tetrachloride both are nonpolar and favour solubility with each other. Also, animal charcoal absolves the colour of bromine water and helps to decolorize bromine water.
The pieces of marble (let’s say CaCO3) are ionic and not symmetrical or can say dipole moment is not zero because of this, marbles are somewhere polar due to this bromine vapour will not dissolve in it and thus, discharge of vapour will not take place.
This, the correct option is A.
Note: The animal charcoal is formed with the horn, blood, bones, etc. of animals. All charcoal has the property to absorb colour and also odour from substances (mostly liquid and gases) for purifying purposes. Charcoal is used for pure drinking water, sugar solution, and many others. So, when it is used with bromine water, it absorbs all the colour of bromine, and the brown colour of bromine will disappear.
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 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

Chemical Properties of Hydrogen - Important Concepts for JEE Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

Atomic Structure - Electrons, Protons, Neutrons and Atomic Models

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Displacement-Time Graph and Velocity-Time Graph for JEE

Types of Solutions

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

NCERT Solutions for Class 12 Chemistry Chapter 1 Solutions

Solutions Class 12 Notes: CBSE Chemistry Chapter 1

NCERT Solutions for Class 12 Chemistry Chapter 6 Haloalkanes and Haloarenes

NCERT Solutions for Class 12 Chemistry Chapter 2 Electrochemistry

Electrochemistry Class 12 Notes: CBSE Chemistry Chapter 2
