EASY
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How many of the following are diamagnetic?

Fe,NaCl,O2,C6H6,CrO2,MnO,Co.

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Important Questions on Solid State

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

 

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

EASY

Which of the following ion is paramagnetic?

EASY
Silicon doped with gallium forms
EASY
Fe,Co,Ni are which type of magnetic substance?
EASY
A common observation seen in Fe3O4 is that it is ferrimagnetic at room temperature but at 850 K it becomes
EASY

From the following which type of magnetic substance magnetite is known?

EASY
Find the non-semiconductor element among the following.
MEDIUM
Which of the following oxides shows electrical properties like metals?
EASY
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because, 
EASY
Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance?
EASY
Define the following with suitable examples: Antiferromagnetism.
HARD

In an experiment, m grams of a compound X (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below. In the presence of a magnetic field, the pan with X is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound X. Identify the correct statement(s).

 Question Image
EASY
To get n-type semiconductors, impurity to be added to silicon should have the following number of valence electrons.
EASY
To get p-type semiconductor, impurity to be added to silicon should have which of the following numbers of valence electrons?
EASY
X ’ melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is:
EASY
The one that is extensively used as a piezoelectric material is: