Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 11

EASY

9th CBSE

IMPORTANT

Earn 100

Unit formula mass of ammonium phosphate [ $({NH}_{4})_{3} {PO}_{4}$ ] is

$[N = 14, H = 1, P = 31, O = 16]$

50% studentsanswered this correctly

Important Questions on Atoms and Molecules

HARD

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 12

0.24 g

sample of a compound of oxygen and boron was found to contain

0.096 g

of boron and

0.144 g

of oxygen. The percentage composition of oxygen and boron is:

HARD

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 13

0.34

g of a sample of a compound of aluminium and oxygen contains

0.18

g of aluminium and rest of oxygen. The percentage mass composition of aluminium and oxygen is:

HARD

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 14

The mass percentage composition of sulphur in calcium sulphate is:

$[Ca = 40, S = 32, O = 16]$

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 15

The mass percentage composition of oxygen in $Pb ({NO}_{3})_{2}$ is:

$[Pb = 207, N = 14, O = 16]$

HARD

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 16

The mass percentage of nitrogen in

{NH}_{4} {NO}_{3}

is:

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 17

A group of

6.022 \times 10^{23}

particles is called:

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 18

1

mole of atoms is equal to:

MEDIUM

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3C>Q 19

One mole of a substance is equal to: