HARD
7th CBSE
IMPORTANT
Earn 100

Write the name of the following compound: 
MgO

Important Questions on Physical and Chemical Changes

HARD
7th CBSE
IMPORTANT
Write the name of the following compound: 
H2SO4
HARD
7th CBSE
IMPORTANT
Write the name of the following compound: 
NaOH
HARD
7th CBSE
IMPORTANT
Write the name of the following compound: 
SO2
HARD
7th CBSE
IMPORTANT
What are the evidences of a chemical reaction? 
EASY
7th CBSE
IMPORTANT
List the differences between physical and chemical changes.
HARD
7th CBSE
IMPORTANT
Name the types of chemical reactions. Explain any one of them with a chemical equation.
HARD
7th CBSE
IMPORTANT
Write the name and number of atoms of the elements that the following compound is made up of.

HNO3 (nitric acid):

An example has been done for you:
CO2 (carbon dioxide): 1 atom of carbon + 2 atoms of oxygen.