Acids and bases 3

1. The taste of acids is

• acid.

• sweet.

• bitter.

• sour.

Which of the following hazard warning labels should be used for a concentrated acid?

• 
• 
• 
• 

When a few drops of methyl orange is added to HNO₃(aq), the solution turns ...

• yellow

• colourless

• red

• blue

H₂SO₄(aq) can conduct electricity because it contains

• mobile ions.

• delocalised electrons.

• H⁺(aq) only.

• SO₄^2-(aq) only.

HNO₃(l) cannot conduct electricity because

• ions are in fixed positions.

• delocalised electrons cannot move.

• it has no mobile ions as HNO₃(l) is a simple molecule.

• it contains too many mobile ions that restrict movement.