MEDIUM
7th CBSE
IMPORTANT
Earn 100

The formula of lead nitrate is PbNO32. What is the ratio in which three elements combine with each other in this compound? 

Important Questions on Matter and Chemical Formulae

MEDIUM
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
How many atoms of hydrogen are present in one molecule of the following compounds: NH42SO4 , NH3 , NH2CONH2
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
Write the chemical formulae for the following compounds: Magnesium chloride, Zinc sulphide, Sodium sulphate, Calcium bicarbonate.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
What is a chemical equation? Explain with an example.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
The chemical formulae of several substances are listed below:
CaF2, Al2O3, Ba, HNO3, Cu, MgO
Classify the substances as element or compound.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
The chemical formulae of several substances are listed below:
CaF2, Al2O3 , Ba, HNO3, Cu, MgO
Name the elements present in each of the compounds listed above.
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
Balance the following reaction.
N2+O2→N2O5
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
Balance the following reaction.
Zn+HNO3→ZnNO32+H2
HARD
7th CBSE
IMPORTANT
Expanded Universal Science 7>Chapter 5 - Matter and Chemical Formulae>ASSESSMENT ZONE>Q F
Balance the following reactions.
Al+O2→Al2O3