Home
Class 12
CHEMISTRY
F-centre is...

F-centre is

A

anion vacancy occupied by unpaired electron

B

anion vacancy occupied by paired electrons

C

anion vacancy occupied by electron

D

anion present in interstitial slite

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

F - centres in an ionic crystals are

Why solids with F-centres are paramagnetic?

What are F-centres in an ionic crystal ?

Explain with suitable examples the following : (a) n-type and p-type semi-conductors (b) F-centres (c) Ferromagnetism.

Assertion: ZnO becomes yellow when it is heated. Reason: The anionic sites occupied by unpaired electrons (due to F-centres )

Define the terms (i) F-centres (ii) n-type semi-conductors (iii) Ferrimagnetism.

Statement-1:p-type semiconductor are good conductor of electricity due to metal excess defect. Statement-2: F-centres are created due to metal excess defect.

The anionic sites occupied by unpaired electrons are called F-centres or colour centres . They impart __(X)__ colour to the crystals of NaCl. Excess of lithium makes LiCl crystals __(Y)__and excess of potassium makes KCl crystals _(Z)___. (X),(Y) and (Z) are

Let F be the family of ellipse whose centre is the origin and major axis is the y-axis. Then the differential equation of family F is

Fill in the blanks by choosing the appropriate word from those given in the brackets. (isotropic, anisotropic, 0.255–0.414, 0.414–0.732, unit cell AB AB, .... ABC ABC ..., ...., 52.4, 60.4, F-centres, V-centres, 4, 2, hexagonal close packing, square close packing, 6, 8 glass, plastics, lead zirconate, barium titanate) In cop arrangement of identical spheres, the pattern of the successive layers will be designated as......