Question

 

Amorphous substances show

(i) short and long range order

(ii) short range order

(iii) long range order

(iv) have no sharp melting point

Solution

Correct option is

(ii) and (iv) are correct

Amorphous solids have short range order but no sharp melting point.

SIMILAR QUESTIONS

Q1

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

Q2

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]

Q3

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

Q4

Which defect causes decreases in the density of crystal?

Q5

The correct statement regarding F – centre is

Q6

Schottky defect in crystals is observed when

Q7

Frenkel defect is caused due to

Q8

An example of a non – stoichiometric compound is

Q9

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.

Q10

The solid NaCl is a bad conductor of electricity since