Table of Contents
- 1 What happens when LiCl is heated in Li Vapours and why?
- 2 Which colour is obtained when lithium chloride is heated in excess of lithium?
- 3 What color flame does lithium produce?
- 4 Which type of defect is shown by LiCl?
- 5 How does lithium produce light?
- 6 What type of point defect is responsible for the pink color of LiCl?
What happens when LiCl is heated in Li Vapours and why?
When a crstal of LiCl is heated in an atmoshere of Li vapour the Li atoms lose electron ti form Li+ ions. These released electrons diffuse into crstal & occupy anionic sites(F-centres). These electrons impart pink colour to the LiCl crystal.
Which colour is obtained when lithium chloride is heated in excess of lithium?
Pink
The colour of LiCl crystals in excess of lithium is Pink.
Which defect is responsible for pink colour of LiCl?
i) The pink colour of LiCl is because of the metal excess defect caused by the anionic vacancies. ii) NaCl shows Schottky defect. In the Schottky defect, an equal number of cations and anion are missing from their regular sites.
When LiCl is doped with Li Vapours the colour developed is?
Hi, When a crystal of LiCl is heated in an atmosphere of Li vapour, the Li atoms lose electron to form Li ions. The released electrons diffuse into the crystal and occupy anionic sites ( F-centres ) . These electrons impart pink colour to the LiCl crystal.
What color flame does lithium produce?
Red
Flame tests
| Ion present | Flame test colour |
|---|---|
| Lithium, Li + | Red |
| Sodium, Na + | Yellow |
| Potassium, K + | Lilac |
| Calcium, Ca 2+ | Orange-red |
Which type of defect is shown by LiCl?
LiCl exhibit non-stoichiometric defect due to metal excess by anionic vacancies.
What type of defect can arise when a solid is heated?
When a solid is heated, vacancy defect can arise. A solid crystal is said to have vacancy defect when some of the lattice sites are vacant. Vacancy defect leads to a decrease in the density of the solid.
Why does lithium produce a red flame?
Lithium burns red because the carmine-red color is imparted by lithium chloride, the color imparted by lithium is less intense than strontium flame…
How does lithium produce light?
The heat from the flame causes the atoms to absorb energy-we say that the atoms become excited. Some of this excess energy is then released in the form of light. The atom moves to a lower energy state as it emits a photon of light. Lithium emits red light because its energy change corresponds to photons of red light.
What type of point defect is responsible for the pink color of LiCl?
Metal excess defect due to anion vaccancy. The formation of F-centre is responsible for the Pink colour of Licl.
Which defect responsible for the colour of crystal?
A negative ion may be missing from its lattice site, leaving a hole which is occupied by an electron, thereby maintaining the electrical balance. The sites containing the electrons thus trapped in the anion vacancies are called F-centres because they are responsible for imparting colour to the crystals.
What is Franklin defect?
A Frenkel defect is a type of point defect in crystalline solids, named after its discoverer Yakov Frenkel. The defect forms when an atom or smaller ion (usually cation) leaves its place in the lattice, creating a vacancy and becomes an interstitial by lodging in a nearby location.