MEDIUM
9th CBSE
IMPORTANT
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The formula of copper sulphate is CuSO4 .What is the valency of copper if the valency of  SO4 is 2?

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Important Questions on Atoms and Molecules

MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
In a sample of ammonia the mass ratio of nitrogen and hydrogen is 14: 3. Find the ratio of N and H atoms in a molecule of ammonia. Relative atomic masses are: H = 1, N = 14.
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
Hydrogen and oxygen combine in the mass ratio of 1: 8 to form water. Calculate the mass of oxygen gas required to react completely with 3g of hydrogen.
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
What are the valencies of Al and carbonate in Al2(CO3)3
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
Which one of the following is equal to one mole of N2
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
How was the postulate of Dalton's atomic theory about the masses of atoms modified?
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
Why has the symbol 'amu' been replaced by u?
MEDIUM
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
What do you understand by Gram Molar Volume?
EASY
9th CBSE
IMPORTANT
The Science Springboard: A Foundation Course Based on NCERT Curriculum>Chapter 8 - Atoms and Molecules>Practice Questions
What is Avogadro's number?