Acid Base and Salt for class 8

Acid is a substance which gives .........................when it is dissolved in water.

• hydroxide ion

• hydroxyl ion

• hydrogen ion or proton (H+)

• all

Blue litmus paper turns into ................ in acidic solution.

• blue

• red

• no change

• pink

.................... turns into pink colour in alkaline solution.

• methyl orange

• red litmus paper

• blue litmus paper

• phenolphthalein

Write the name of the acid with molecular formula H₂SO₄

(a)  

How many types of acids are there?

• 1

• 2

• 3

• 4

write the name of the acid present in curd.

(a)  

What is the pH value of pure water?

• 6

• 7

• 0

• 1

pH scale ranges from ................

• 1-14

• 1-7

• 2-14

• 0-15

Which of the following statements is correct?

• acids have pH more than 7

• neutral substances have pH 7

• alkalis have pH less than 7

• all acids have sour taste

Name the salt used for reducing constipation.

(a)