MEDIUM
7th CBSE
IMPORTANT
Earn 100

Which of the following is not a mixture?

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Important Questions on Structure of Matter

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q A

The valency of which of these elements is zero?

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q A
Which of these is the formula for calcium hydroxide?
HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q A
The equation Na+H2O→NaOH+H2 is
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q B
What is the smallest particle of an element that can take part in a chemical reaction? 
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q B

The smallest particle of a compound is _____.

MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q B
Name an element which exists in the free state in nature.
HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q B
Name an element whose atoms occur in pairs.
HARD
7th CBSE
IMPORTANT
Living Science 7>Chapter 3 - Structure of Matter>EXERCISES>Q B
If the formula of an element is X3, its atomicity is _____.