Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 25

EASY

9th CBSE

IMPORTANT

Earn 100

The valency of phosphide in calcium phosphide ( ${Ca}_{3} P_{2}$ ) 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 26

The formula of aluminium sulphate is

{Al}_{2} ({SO}_{4})_{3}

. The formula of aluminium nitride is:

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 1

Define the term molecule.

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 2

What do you understand by the term atomicity of the molecule of an element?

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9th CBSE

IMPORTANT

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

What is the difference between

2 Cl

,

{Cl}_{2}

and

4 {Cl}_{2}

?

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 4

What do you understand by the term valency of an element?

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9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 5

An element E forms the following compounds with hydrogen and oxygen.

(a) $H_{2} E$ (b) ${EO}_{2}$ (c) ${EO}_{3}$

Identify the valency of each in the given compounds.

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 6

The formula of aluminium sulphate is

{Al}_{2} ({SO}_{4})_{3}

. Write the formula of aluminium chloride and aluminium nitride

EASY

9th CBSE

IMPORTANT

Core science chemistry>Chapter 3 - Atoms and Molecules>EXERCISE 3B>Q 7

Which of the following symbols of elements are incorrect? Give their correct symbols
(a) Cobalt            CO
(b) Carbon            c
(c) Aluminium        AL
(d) Helium            He
(e) Sodium            So