EASY
9th CBSE
IMPORTANT
Earn 100

Calculate the molar mass of sulphuric acid (H2SO4).

Important Questions on Atoms and Molecules

EASY
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 21
What is atomicity? Give one example of each of diatomic and triatomic substances.
EASY
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 22

An element B shows the valency of 4+ and 6+. Write the formula of its oxides.

EASY
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 23
How many atoms are present in 0.25 mole of hydrogen (H2)?
MEDIUM
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 24

State the law of conservation of mass. Give an evidence in support of the law.

HARD
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 25
Point out the limitations of the law of constant composition if any.
MEDIUM
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 26

Give three postulates of Dalton's atomic theory.

HARD
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 27
Most of the postulates of Dalton's Atomic theory been found to be defective. Justify.
MEDIUM
9th CBSE
IMPORTANT
Super Simplified Science Chemistry CLASS IX>Chapter 3 - Atoms and Molecules>Test Your Knowledge>Q 28

Give two points of distinction between atom and molecule.