$4$g of ${\mathrm{CH}}_4$ and $8$g of ${\mathrm{O}}_2$ contain

Important Questions on Atoms and Molecules

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 13

Which of the following is octa-atomic? 

HARD

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 14

Mass of one atom of oxygen is 

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 15

$3.42$ g of sucrose are dissolved in $18$g of water in a beaker. The number of oxygen atoms in the solution are 

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 16

A change in the physical state can be brought about 

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 18

Matter can neither be created nor be destroyed is law of conservation of _____.

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 19

The lightest element is _____. (Nitrogen/ Hydrogen)

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 20

One mole of sodium sulphate contains $2$ atoms of $\mathrm{Na}$, $1$ atom of $\mathrm{S}$, $4$ atoms of oxygen.

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 3 - Atoms and Molecules>ASSESS YOURSELF>Q 21

The name of ${\mathrm{Li}}_3\mathrm{N}$ is lithium nitrite.