6.1 Properties of acid and alkali

Acids have pH value

• Less than 7

• 7

• More than 7

Acids has ____________ taste.

• bitter

• sour

• no

Both acid and alkali can be corrosive.

• Yes

• No

Acids change blue litmus paper from

• blue to red

• red to blue

Alkalis react with metal and produce hydrogen gas.

• Yes

• No

When alkalis are tested using Universal indicator, the indicator turns

• red

• green

• blue

When a neutral solution is tested using Methyl orange, what colour is formed?

• yellow

• orange

• red

Detergents have pH more than 7.

• True

• False

Tomato has pH value less than 7.

• True

• False

Lime juice has pH value less than 7.

• Yes

• No