Solid State Test

Result

Solid State Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

CsCI type cubic lattice can be transformed into rock salt type by applying

A
not possible

B
both

C
High pressure

D
high temperature

Solution

Coordination number decreases on increasing temperature. Both r₊ and r₋ increase with increase in temperature but the latter much more rapidly. As a result the ratio r₊/r− decreases.
Question 2
1 / -0

In the unit cell of KCI, CI⁻ ions constitute ccp and K⁺ ions fall into the octahedral holes. These holes are

A
8 at the centres of 8 small cubes forming the unit cell

B
One at the centre and 6 at the centres of the faces.

C
One at the centre and 12 at the centres of the edges.

D
None of these.

Solution

These holes are One at the centre and 12 at the centres of the edges.
Question 3
1 / -0

Oxides of alkaline earth metals crystallize in rock salt type cubic lattice showing 6:6 coordination except BeO, which shows 4:4 coordination. This is due to the reason that BeO is

A
amphoteric

B
covalent

C
ionic

D
polymeric

Solution

This is due to the reason that BeO is covalent.
Question 4
1 / -0

When anion leaves the normal lattice site and occupies interstitial in its crystal lattice, it is called

A
Non-stoichiometric defect

B
Frenkel defect

C
Schottky defect

D
Crystal defect

Solution

When anion leaves the normal lattice site and occupies interstitial in its crystal lattice, it is called as Frenkel defect.