Solid State Tes...

Select the wrong statement (s) :-

In a unit cell, atoms A, B, C and D are present at half of total corners, all face-centres, body-centre and one third of all edge-centres respectively. Then formula of unit cell is ?

If the radius of $${Cl}^{-}$$ ion is $$181pm$$, and the radius of $${Na}^{+}$$ ion is $$101pm$$ then the edge length of unit cell is:

Total number of unit cells present in a cube shaped ideal crystal of $$1g \ NaCl(s)$$ is (Avogdro's number = $$6\times10^{23}$$).

(i) Frenkel defect create a vacancy defect at its original site and an interstitial defect at its new position.
(ii) Frenkel defect is stoichiometric point defect.
(iii) Frenkel defect is also called dislocation defect.
(iv) Silver halide shows Frenkel defect 
Select the correct statements :

Lattice energy of $$NaCl$$ is $$'X'$$. If the ionic size of $$A^{ +2 }$$ is equal to that of $$Na^{ + }$$ and $$B^{ -2 }$$ is equal to $$Cl^{ - }$$, then lattice energy associated with the crystal $$AB$$ is:

Which of the following expression is correct for packing fraction of $$NaCI$$ if the ions along with face are diagonally removed ?

An element having a face-centered cubic structure has a density of $$6.23g\ cm^{-3}$$. The atomic mass of elements is $$60$$. The edge length of the unit cell is:

Which of the following solid substance(s) will have the same refractive index when measured in different directions?

Lattice energy of an ionic compound depends upon?