EASY
9th CBSE
IMPORTANT
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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:

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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 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:
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 10
An electrically charged particle formed from an element which may have a positive or negative charge, is called:
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9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 11
The number of hydrogen atoms, which combine directly or indirectly with one atom of an element, so as to form a chemical compound is:
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 12
Which amongst the following has +2 valency?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 13
Which amongst the following has 1+ valency?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 14
Which amongst the following has 3+ valency?
EASY
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 15
Which amongst the following has variable positive valency?
MEDIUM
9th CBSE
IMPORTANT
Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 16
Which amongst the following radicals have 1+  valency?