ACIDS AND BASE

Which of the substance is acidic?

• Detergent powder

• Limewater

• Vinegar

• Baking powder

Acid is a chemical compound which ionises in water to produce ...

• hydrogen atoms

• hydrogen ions

• hydroxide ions

• oxygen atoms

In water, alkalis will ionise to produce ...

• hydrogen ions

• hydroxide ions

• ammonium ions

Properties of substance A:

1. Taste bitter

2. Feels slippery like soap when touched

3. Has pH more than 7

4. Changes red litmus paper to blue

Based on the properties of substance A, we can predict that substance A is an

• alkali

• acid

• salt

An acid changes the blue litmus paper to red.

Statement above is TRUE or FALSE?

• True

• False

Acids and alkalis only show their properties in the presence of (a)  

In acidic solution, methyl orange is .........in colour

• yellow

• orange

• red

In alkaline solution, the phenolphthalein is ........in colour

• colourless

• pink

• blue

• purple

In neutral solution, an universal indicator is ...........in colour.

• red

• green

• purple

• yellow

The process that occur when an acid reacts with an alkali to produce salt and water is called...

• coagulation

• sublimation

• neutralisation

• diffusion