MEDIUM
7th ICSE
IMPORTANT
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Phosphorus exists in the form of molecule. 
 

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Important Questions on Atomic Structure

MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 1
 All the postulates of Dalton's atomic theory were correct.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 2
A molecule cannot exist in free state.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 3
Atomicity of noble gases is 2.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 4
Valency is always a whole number. 
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 5
Acid radical has positive valency.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 6
Valency of sulphate in H2SO4 is -2.
MEDIUM
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 7
Periodic table has seven groups. 
EASY
7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 4 - Atomic Structure>EXERCISES>Q 1

Write the molecular formula for the following:

Calcium chloride