Which of the following is an example of an ionic crystal solid?

Which of the following arrangements shows the schematic alignment of magnetic moments of an antiferromagnetic substance?

An ionic solid is a poor conductor of electricity because ..........

Classify the following as amorphous or crystalline solids: Polyurethane,naphthalene,benzoic acid,teflon,potassium nitrate,cellophane,polyvinyl chloride,fibre glass,copper.

Match the following magnetic properties with their respective domain alignments shown in the image.

$A$. Antiferromagnetism	$I$. $\uparrow \downarrow \uparrow \downarrow \uparrow \downarrow$
$B$. Ferromagnetism	$II$. $\uparrow \uparrow \uparrow \uparrow \uparrow \uparrow$
$C$. Ferrimagnetism	$III$. $\uparrow \uparrow \downarrow \uparrow \uparrow \downarrow$

The correct matching is:

Which of the following statements is true for a crystalline solid?