Question

A pure crystalline substance, on being heated gradually, first forms a turbid looking liquid and then the turbidity completely disappears. This behavior is the characteristic of substances forming.

Solution

Correct option is

liquid crystals

It is a characteristic of liquid crystal.

SIMILAR QUESTIONS

Q1

In zinc blende structure, the coordination number of Zn2+ ion is

Q2

In the calcium fluoride structure, the coordination number of the cation and anion are respectively

Q3

When a certain crystal was studied by the Bragg technique using X – rays of wavelength 229 pm, an X – ray reflection was observed at an angle of 230 20’. What is the corresponding interplanar spacing? [sin (23020’) = 0.396]

Q4

Potassium fluoride has NaCl type structure. What is the distance between K+ and F- ions if cell edge is a cm?

Q5

Which defect causes decreases in the density of crystal?

Q6

The correct statement regarding F – centre is

Q7

Schottky defect in crystals is observed when

Q8

Frenkel defect is caused due to

Q9

An example of a non – stoichiometric compound is

Q10

 

Amorphous substances show

(i) short and long range order

(ii) short range order

(iii) long range order

(iv) have no sharp melting point