Properties of Acids and Alkalis

What is the property of acids and alkali that is shown in the video?

• Flammable

• Corrosive

• Irritant

• Biohazardous

Which substance have a soapy touch?

• Acid

• Alkali

What is the taste of alkalis?

• Alkalis are bitter.

• Alkalis are sweet.

• Alkalis are sour.

• Alkalis are salty.

What is the taste of acids?

• Acids are bitter.

• Acids are sweet.

• Acids are sour.

• Acids are salty.

If a blue litmus paper is inserted into an acid, what colour change will take place?

• It will change to red.

• It will stay blue.

If a blue litmus paper is inserted into an alkali, what colour change will take place?

• It will change to red.

• It will stay blue.

If a red litmus paper is inserted into an acid, what colour change will take place?

• It will change to blue.

• It will stay red.

If a red litmus paper is inserted into an alkali, what colour change will take place?

• It will change to blue.

• It will stay red.

Which of the following are properties of acids? (Tick all the correct answers.)

• Acids have pH more than 7.

• Acids have pH less than 7.

• Acids are bitter in taste.

• Acids turns blue litmus paper red.

• Acids turn red litmus paper blue.

Which of the following are properties of alkalis? (Tick all the correct answers.)

• Alkalis have pH more than 7.

• Alkalishave pH less than 7.

• Alkalis are bitter in taste.

• Alkalis turns blue litmus paper red.

• Alkalis turn red litmus paper blue.