MEDIUM
7th CBSE
IMPORTANT
Earn 100

Which of the following cannot be broken down into simpler substances by chemical means?

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Important Questions on Chemicals and Chemical Changes

EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
What is the symbol of iron?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which of the following represents the chemical formula of a compound?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
What are the new substances (elements / compounds) formed in a chemical reaction called?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
What is the substance responsible for the browning of cut surfaces of vegetables and fruits called?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which of the following elements exist as tetratomic molecules?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
What is the chemical formula of sodium oxide?
MEDIUM
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which gas is released in reaction of vinegar with baking soda?
EASY
7th CBSE
IMPORTANT
NEW SCIENCE In Everyday Life>Chapter 4 - Chemicals and Chemical Changes>Exercises>Q B
Which of the following elements exhibits valency 2?