MEDIUM
9th ICSE
IMPORTANT
Earn 100

In which of the following substances will there be an increase in mass when they are exposed to air?

  • Sodium chloride
  • Iron
  • Conc. sulphuric acid
  • Table salt
  • Sodium carbonate crystals

Important Questions on Water

MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(B)>Q 17

In which of the following substances will there be a decrease in mass when they are exposed to air?

1. Sodium chloride 2. Iron 3. Conc. sulphuric acid 4. Table salt 4. Sodium carbonate crystals

MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(B)>Q 17

In which of the following substances will there be no change in mass when they are exposed to air?

  • Sodium chloride
  • Iron
  • Conc. sulphuric acid
  • Table salt
  • Sodium carbonate crystals
MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(B)>Q 18
State the methods by which hydrated salts can be made anhydrous.
EASY
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(C)>Q 1
What is the composition of water? In what volume does its elements combine?
MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(C)>Q 2
What is the use of solubility of oxygen and carbon dioxide in water?
MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(C)>Q 3
How is a saturated solution of sodium nitrate forms crystals, as it cools? Why?
MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(C)>Q 4
What are hydrous substances? Explain with examples.
MEDIUM
9th ICSE
IMPORTANT
Concise Chemistry Class 9>Chapter 3 - Water>EXERCISE 3(C)>Q 5
Name the three methods by which hydrous substances can be made anhydrous.