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Frenkel Defect

In the labora...

Question

In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is

A

Presence of N^a+ions in the crystal lattice

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B

Presence of Cl^- ions in the crystal lattice

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C

Presence of electron in the crystal lattice

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D

Presence of face centered cubic crystal lattice

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Solution

The correct option is C Presence of electron in the crystal lattice
Yellow colour on heating NaCl in presence of Na is due to presence of electrons
in anion vacancies (F-centres).

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Similar questions

Q. For a crystal of sodium chloride, state:
(i) The type of lattice in which it crystallizes.
(ii) The coordination number of each sodium ion and chloride ion in the crystal lattice.
(iii) The number of sodium ions and chloride ions present in a unit cell of sodium chloride.
(iv) The structural arrangement of the sodium chloride crystal.

Q. Assertion :NaCl crystal is sometimes yellow in colour. Reason:

N a^{+}

in the crystal absorbs electron from air and hence, gives yellow colour.

Q. If the distance between

N a^{+}

C l^{-}

ions in sodium chloride crystal is

y p m

, the length of the edge of the unit cell is:

Q. How many chloride ions are present surrounding the sodium ion in sodium chloride crystal?

Q. Assertion (A) : In sodium chloride crystal,

N a^{+}

ions occupy octahedral voids while

C l^{-}

ions occupy vertices of octahedron.
Reason (R) : The radius ratio of

N a^{+}

C l^{-}

0.4

0.7

.

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