CBSE Class 7 Science Exploring Substances: Acidic Basic and Neutral (Class 7 NCERT New) Quiz 11

1. What is the name of this ion: H3O+?

A helium ion B hydrogen ion C hepatic ion D hydronium ion

2. Which of the following is NOT a strong acid?

A HCl B HClO5 C H2SO4 D HNO3

3. Which one of the following statements about strong acids is TRUE?

A Strong acids are 100% ionized in water. B The conjugate base of a strong acid is a strong base. C Strong acids are very concentrated acids. D Strong acids produce solutions with a higher pH than weak acids.

4. Which of the following is a salt: ammonia or sodium chloride?

A ammonia B sodium chloride

5. The difference between a strong and weak acid is:

A Strong acids stay intact in water weak acids don't B Strong acids are slippery weak acids aren't C Strong acids break apart in water. Weak acids stay intact D Weak acids break apart in water most of the time, strong acids do all of the time.

6. Why does vinegar help preserve things like pickles?

A It keeps moisture in. B It preserves flavors and crispness C It kills bacteria that break down foods. D It keeps the cells alive

7. Which solution releases H+ in solution?

A Base B Acid C Buffer D Water

8. Bleach is a strong base, what is the pH level of bleach?

A 13 B 14 C 1 D 2

9. The following properties are describing ______:* pH range of 0-6.9*turn litmus red*contains more H+ than OH-

A acids B bases C salts D neutralization

10. A way to measure the concentration of hydrogen ions in a solution is to use a(n) _____.

A indicator B litmus C pH scale D acid