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Crystal Lattice and Unit Cell

What makes th...

Question

What makes the crystal of $K C l$ appear sometimes violet?

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Solution

An excess of potassium ions make $K C l$ crystals appear violet.

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Q. An excess of potassium ions makes KCl crystals appear violet or Lilac in colour since

Q. On heating crystals of

K C l

in potassium vapours, the crystals start exhibiting violet colour. Why?

Q. On heating a crystal of KCl in potassium vapour the crystal starts exhibiting a violet colour. Why

An excess of potassium ions makes KCL crystals appear violet or lilac colour since ................

(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-centres are created which impart colors to the crystals

Q. The anionic sites occupied by unpaired electrons are called F-centers or colour centers. They impart ______

(X)

colour to the crystals on

N a C l .

Excess of lithium makes

L i C l

crystals ______

(Y)

and excess of potassium makes

K C l

crystals ______

(Z)

(X)

(Y)

(Z)

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