EASY
9th CBSE
IMPORTANT
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The smallest unit of a pure substance, which can always exist independently and can retain all the physical and chemical properties of it, is called:

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Important Questions on Atoms and Molecules

EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 2
Which of the following is monoatomic molecule of an element?
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 3
Which of the following is diatomic molecule of an element?
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 4
The atomicity of ozone molecule is:
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 5
Which is the correct formula of the molecule of element sulphur?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 6
Which amongst the following elements is tetratomic?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 7
The symbolic representation of the kind and actual number of atoms present in one molecule of a pure substance is called its:
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 8
The ratio of masses of carbon and oxygen is 3:8 and their atomic masses are 12 and 16 in one molecule of carbon dioxide. The ratio of atoms of carbon and oxygen in carbon dioxide is:
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 9
The ratio of masses of sulphur and oxygen is 2:3 and their atomic masses are 32 and 16 in one molecule of sulphur trioxide. The ratio of atoms of sulphur and oxygen in sulphur trioxide is: