Ferromagnetic substances show a sharp decrease in magnetic susceptibility above a certain temperature known as:
Curie temperature
Néel temperature
Critical temperature
Transition temperature
Related Questions
Solids are characterised by their properties :
Incompressibility
Mechanical strength
Crystalling nature
All of these
Amorphous solids:
Possess sharp melting points
Undergo clean cleavage when cut with knife
Do not undergo clean cleavage when cut with knife
Possess orderly arrangement over long distances
A novel crystalline solid exhibits anisotropic conductivity, high melting point, and is insoluble in common organic solvents. However, upon heating above a critical temperature, it transforms into another solid form that becomes isotropic in conductivity. What can be inferred about the nature of the transition and the high-temperature phase?
The transition is melting, and the high-temperature phase is a liquid.
The transition is sublimation, and the high-temperature phase is a gas.
The transition is a solid-state phase change to a more disordered structure, and the high-temperature phase is likely more isotropic and potentially amorphous or cubic.
The transition is a chemical decomposition, and the high-temperature phase consists of simpler molecular species.
Which type of solid is characterized by a sea of delocalized electrons?
Ionic
Covalent
Molecular
Metallic
Solids are characterised by their properties :
Incompressibility
Mechanical strength
Crystalling nature
All of these
Quartz is an example of :
Chain silicate
Infinite sheet silicate
Framework silicate
Cyclic silicate
Piezoelectric substance of the following is
Fullerence
Quartz
Graphite
Charcoal
Which one of the following is a covalent crystal?
Rock salt
Ice
Quartz
Dry ice
Amorphous substances show (i) Short and long range order (ii) Short range order (iii) Long range order (iv) Have no sharp melting point
(i)and (iii) are correct
(i)and (ii) are correct
(ii)and (iii) are correct
(ii)and (iv) are correct
is a/an :
Ionic crystal
Metallic crystal
Covalent crystal
Molecular crystals
