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Which of the following statements are true?
I. Ferrimagnetic material, Fe3O4 becomes paramagnetic at 850 K.
II. Paramagnetic behaviour of a material is due to the presence of the unpaired electrons in it.
III. The maximum coordination number in ionic solids is 12.

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Important Questions on Solid State

EASY
The one that is extensively used as a piezoelectric material is:
MEDIUM
Which of the following oxides shows electrical properties like metals?
HARD

Match the following:

i Ge doped with  In 1. n-type semiconductor
ii Si doped with N 2. Schottky defect
iii ZnS 3. p-type semiconductor
iv CsCl 4. Frenkel defect

 

EASY
Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance?
MEDIUM

What are paramagnetism and ferromagnetism ? What type of substances would make better permanent magnets - ferromagnetic or ferrimagnetic ?

EASY

What is meant by ferrimagnetism? Give any two examples.

EASY
X ’ melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is:
EASY
Find the non-semiconductor element among the following.
EASY
A common observation seen in Fe3O4 is that it is ferrimagnetic at room temperature but at 850 K it becomes
EASY
Define the following with suitable examples: Antiferromagnetism.
EASY
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because, 
MEDIUM

Match List - I with List - II:

List-I (Property) List-II (Example)
(a) Diamagnetism (i) MnO
(b) Ferrimagnetism (ii) O2
(c) Paramagnetism (iii) NaCl
(d) Antiferromagnetism (iv) Fe3O4

Choose the most appropriate answer from the options given below:

MEDIUM
Which one of the following species responds to an external magnetic field?