GRADE 12 -STEM -GEN CHEM Q4

Which of the following properties of ionic compounds?

• hard solids with high melting and boiling points

• good conductor of electricity, but only when dissolved in water

• both A and B

• soft and good conductors of electricity

What happens to like-charge ion when ionic crystal is struck with great force?

• They repel each other so the crystal shatters

• They are displaced to other positions within the crystal lattice

• They attract one another , so that the crystal does not break

• They slide past one another because the crystal is malleable

Ionic compounds do not conduct electricity in solid state since

• Ions move in a single direction

• Ions is very large in size

• Ions are not free to move

• Both A and B

How are ionic compounds named?

• positive ions comes first in the compound name

• negative ions comes first in the compound name

• ion in the higher-numbered period comes first in the compound name

• two of the above

Which conduct electricity well?

• distilled water

• solid sodium chloride

• sodium chloride dissolved in water

• none of the above

Which is responsible for the vivid colors of many minerals and gemstone?

• impurities

• alkali metals ions

• transition metal ions

• chloride ions

Molten ionic compounds do not conduct electricity since the ions are not free to to move.

• True

• False

In what state(s) does an ionic compound conduct an electric current?

• solid

• liquid

• aqueous(dissolved)

• b and c

Molten sodium chloride conducts electricity due to the presence of ______.

• free electrons

• free molecules

• ions

• none of the above

Solid ionic compound easily conduct electricity.

• False

• True