CBSE Class 7 Science Exploring Substances: Acidic Basic and Neutral (Class 7 NCERT New) Quiz 5

1. Syazwani has gastritis. Among the following, what action can she take to reduce the gastritis?

A Eat oranges B Eat pineapple C Drink lemon juice D Drink cow's milk

2. Diagram shows animal P. Hamka was stung by animal P while swimming at a beach. Which of the following immediate actions should he take to prevent more serious injury?

A Pour vinegar on the wound area B Urinate in the wound area C Wrap the wound tightly D Wipe the wound area with toothpaste

3. Write the colour change for the indicators below based on the following substances. For a detergent solution (alkali), what colour change is observed with phenolphthalein indicator?

A Colourless to pink B Pink to colourless C Blue to red D Green to yellow

4. Write the colour change for the indicators below based on the following substances. For citrus juice (acid), what colour change is observed with methyl orange indicator?

A Yellow to red B Red to yellow C Blue to green D Purple to pink

5. Write the colour change for the indicators below based on the following substances. For a carbonated cola drink (acid), what colour change is observed with blue litmus paper?

A Blue to red B Red to blue C Blue to green D No colour change

6. Feels slippery.

A Acids B Bases C neutral D All

7. Tastes bitter.

A Acids B Bases C Salts D All

8. Forms hydroxide ions (OH-) in water

A Acids B Bases C All

9. pH less than 7.

A Acids B Bases C All

10. pH greater than 7.

A Acids B Bases C All D pure water