Amorphous Forms of Carbon

Q.

Which of the following statement is incorrect about the crystalline and amorphous solids?

1. Crystalline solids have ordered structure but amorphous solids do not.

2. Crystalline solids have a sharp melting point but amorphous solids do not.

3. Crystalline solids have a characteristic heat of fusion but amorphous solids do not.

4. Crystalline solids give irregular cleavage whereas amorphous solids can be cleaved along definite planes.

Q.

How many types of solids are there?

Q.

Distinguish between crystalline solid and amorphous solid.

Q.

How can anyone differentiate crystalline and amorphous solids?

Q.

Mention on what basis are crystalline solids different from amorphous solids.

Q.

Crystalline form has fixed melting point but amorphous form doesn't.

1. False

2. True

Q. is the finely powdered form of amorphous carbon formed due to burning of carbon compounds in insufficient air.

1. Coal tar
2. Lampblack
3. Coal gas

Q.

)What s lattice enthalpy and how is it related to stabiity of ionic compound ?