LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

MEDIUM

9th CBSE

IMPORTANT

Earn 100

The number of atoms present in $64$ g of $S_{8}$ is $12.04 \times 10^{23}$ .

33.33% studentsanswered this correctly

Important Questions on Atoms and Molecules

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

An atom of sodium is

23

times heavier than

{\frac{1}{12}}^{th}

of the mass of ¹²C atom.

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

The percentage of water of crystallisation in washing soda is

60.9 %

.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

8.0 g of oxygen contains the same number of atoms as in 7.0 g of nitrogen.

HARD

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

The percentage of nitrogen in ammonium nitrate is

36.0 %

.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

A mole of atoms of any element has a mass in grams equal to its atomic mass.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

In a chemical compound, the constituent elements are present in definite proportion by mass.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

The mass of a single molecule of water is

2.99 \times 10^{- 23}

g.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

The ratio by mass of the elements present in a molecule of phosphorus pentachloride (

{PCI}_{5}

) is 31 :177.5.