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प्रश्न
Why are halogens coloured?
Why are all halogens coloured?
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उत्तर
Almost all halogens are coloured. This is because halogens absorb radiation in the visible region. This results in the excitation of valence electrons to a higher energy region. Since the amount of energy required for excitation differs for each halogen, each halogen displays a different colour.
संबंधित प्रश्न
Iodine exists as
- polar molecular solid
- ionic solid
- nonpolar molecular solid
- hydrogen bonded molecular solid
Fluorine is a stronger oxidising agent than chlorine. Why?
Account for the following :
Acidic character increases from HF to HI.
Which halogen compound in the following pair will react faster in SN2 reaction CH3Br or CH3I.
Write two uses of ClO2.
Write the reactions of F2 with water.
Arrange the following in the order of property indicated for the given set:
HF, HCl, HBr, HI - increasing acid strength.
Complete chemical reactions are:Cl2 + H2O →
Arrange the following in the decreasing order of their reducing character :
HF, HCl, HBr, HI
Select the correct alternative from the choices given :
The correct order of increasing acidic strength of the oxoacids of chlorine is:
Cl2 acts as a bleaching agent.
Tincture of iodine is ____________.
Fluorine differs from the rest of the halogens in some of its properties. This is due to ____________.
Bond dissociation enthalpy of E–H (E = element) bonds is given below. Which of the compounds will act as the strongest reducing agent?
| Compound | \[\ce{NH3}\] | \[\ce{PH3}\] | \[\ce{AsH3}\] | \[\ce{SbH3}\] |
| Δdiss (E – H)/kJ mol–1 | 389 | 322 | 297 | 255 |
Which of the following is isoelectronic pair?
Solubility of iodine in water may be increase by adding
Give a reason for the following:
Mn+2 compounds are more stable than Fe+2 compounds.
Arrange the following in the increasing order of the property mentioned:
MF, MCl, MBr, MI (ionic character)
