Questions
An excess of potassium ions makes KCI crystals to appear violet or lilac in colour since….
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By Expert Faculty of Sri Chaitanya
a
some of the anionic sites are occupied by an unpaired electron
b
some of the anionic sites are occupied by a pair of electrons
c
there are vacancies at some anionic sites
d
F- centers are created which impart colour to the crystals
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Correct option is C
When KCl crystals are heated,it1eadstothedepositionof potassium ion on the surface of KCl. The Cl- ions diffuse to the surface of crystal and loss of electron convert potassium atom in to K+ ion. The released electron occupies anionic site which is known as .F- centre and impart colour to the crystal.
Similar Questions
Statement 1: On heating NaCl in sodium vapors turn yellow.
Statement 2: This happens due to metal excess defect due to anionic vacancies.
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