CBSE Class 7 Science Exploring Substances: Acidic Basic and Neutral (Class 7 NCERT New) Quiz 9

1. Litmus Paper

A Liquid indicator that changes pink in the presence of a base B A type of paper used to indicate the presence of acids and bases C a chemical that changes color in the presence of acids and changes a different color in the presence of bases D the amount of solute dissolved in solution

2. Neutralization

A Compound formed by a metal and a nonmetal B The reaction between an acid and a base which produces a salt and water C A chemical whose color changes in the presence of acids and bases D To decrease the amount of solute as compared to the amount of solvent in a solution

3. Which of the following is an acid?

A Ammonia B Drain cleaner C Shampoo D Orange

4. Which of the following statements is true concerning acids and bases?

A acids and bases don't react with each other B acids mixed with bases neutralize each other C acids mixed with bases make stronger bases D acids mixed with bases make stronger acids

5. Which is the correct set of acid properties, as described by Boyle:

A sour taste, corrosive, change litmus from red to blue B sour taste, corrosive, change litmus from blue to red C sweet taste, slippery, change litmus from blue to red D sour taste, slippery, change litmus from blue to red

6. What is the approximate pH of seawater?

A 2 B 5 C 7 D 9

7. When the pH scale goes lower than 7, it means that the substance is ______.

A neutral B acidic C basic D salt

8. Which concept is correct?

A Arrhenius stated that acids are hydrogen ion donors B Lewis stated that acids accept negatively charged ion acceptors C Bronsted-Lowry stated that bases accepts Hydrogen ions D All of the statements are correct

9. A pH scale of 0 _____ to people when exposed without protection

A is beneficial B is dangerous C has no effect D medicinal value

10. This citrus fruit commonly consumed at home has a ph level of _____.

A below 7 B 7 C above 7 D 0