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

MEDIUM

9th CBSE

IMPORTANT

Earn 100

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.

Important Questions on Atoms and Molecules

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

EASY

9th CBSE

IMPORTANT

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

What is the difference between the symbol of an element and the formula of a compound?

EASY

9th CBSE

IMPORTANT

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

Write the valencies and chemical formula of Zinc carbonate.

EASY

9th CBSE

IMPORTANT

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

Write the valencies and chemical formula of Ammonium sulphide.

EASY

9th CBSE

IMPORTANT

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

Write the valencies and chemical formula of Barium chloride.

EASY

9th CBSE

IMPORTANT

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

Write the valencies and chemical formula of Sodium nitrate.

EASY

9th CBSE

IMPORTANT

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

Write the chemical name of

Mg ({HCO}_{3})_{2}

.