Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 5

HARD

9th CBSE

IMPORTANT

Earn 100

Calculate the number of bromide ions in $0.2$ mole of ${MgBr}_{2}$ .

Important Questions on Atoms and Molecules

MEDIUM

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 1

Define atomic mass unit.

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 2

Give one example each of a trivalent cation and a trivalent anion.

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 3

What is the mass of 1 mole of water?

MEDIUM

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 4

Write the formula of a chemical compound formed by the

{Fe}^{3 +}

and

{SO}_{4}^{2 -}

ions.

MEDIUM

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 5

An element

X

has a valency of

3

. What is the formula of oxide of

X

?

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 6

Define a mole. What are the two things that a mole represents?

EASY

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 7

Carbon and oxygen combine in the ratio of

3 : 8

by mass to form carbon dioxide. What mass of oxygen will be required to combine completely with

12 g

of carbon?

HARD

9th CBSE

IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>TEST YOURSELF>Q 8

Calculate the mass of one molecule of carbon dioxide.