EASY
9th CBSE
IMPORTANT
Earn 100

Write the atomic symbol of each one of the following elements:

Hydrogen, helium.

Important Questions on Atoms and Molecules

EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 1

Write the atomic symbol of each one of the following elements:

Iron, iodine.

MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 1
Write formula of two simple anions.
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 1
Write formula of two polyatomic anions.
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 2
Given an example of a polyatomic cation.
EASY
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 1
Write the name of the unit for reporting the amount of substance in a chemical system. (SI unit)
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 2
How many O2 molecules are there in one mole of oxygen gas?
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 3
Calculate the number of H2O molecules in 10 moles of water.
MEDIUM
9th CBSE
IMPORTANT
Secondary Chemistry>Chapter 3 - Atoms and Molecules>Problems for Proficiency>Q 4
Calculate the number of Na atoms in 0.2 mol of sodium.