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Standard XII

Chemistry

Metal Excess Defect

In metal exce...

Question

In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

What is the effect of metal excess defect on density of the crystal?

Increases

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Decreases

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Does Not have any effect

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Decreases, then increases

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Solution

The correct option is B
Decreases

Density of crystal decreases due to this defect because anions miss from their lattice points and are occupied by very lightweight electrons.

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Paragraph :In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

Question: In metal excess defect

Question: The colour of NaCl changes when heated in sodium vapour due to

Schottky defect is observed in crystals when .....................

(a) some cations move from their lattice site to interstitial sites

(b) equal number of cation and anions are missing from the lattice

(d) some impurity is present in the lattice

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)

and

(Z)

are:

Q. Assertion (A) : The density of crystal having Schottky defect is lowered.
Reason (R) : The crystals suffering from Schottky defect have same number of cations and anions missing from their normal lattice sites.

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In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers. What is the effect of metal excess defect on density of the crystal?

The correct option is B Decreases Density of crystal decreases due to this defect because anions miss from their lattice points and are occupied by very lightweight electrons.

In metal excess defect, anions all missed from their lattice sites and they are occupied by electrons to maintain electrical neutrality. These sites occupied by electrons are called F-centers.

What is the effect of metal excess defect on density of the crystal?

The correct option is B
Decreases

Density of crystal decreases due to this defect because anions miss from their lattice points and are occupied by very lightweight electrons.