Find the valences of the underlined elements or radicals in the following compounds. B a _ C l 2 , P _ C l 3 , P _ C l 5 , N _ H 3 , M g S O 4 _ , C a C O 3 _ , N a 2 _ O , C a _ O , C a _ O H 2 , F e _ S O 4 , F e _ C l 3 , F e 2 _ O 3 , N a O H _ , A l _ O H 3 , N a 2 _ C o 3

The Valency of an element is its combining power with other atoms when it forms chemical compounds. The Valency of an element is the number of electrons combined with atoms of other elements. The Valencies of the underlined elements or radicals are as follows. B a _ C l 2 ⟶ 2 P _ C l 3 ⟶ 3 P _ C l 5 ⟶ 5 N _ H 3 ⟶ 3 M g S O 4 _ ⟶ 2 C a C O 3 _ ⟶ 2 N a 2 _ O ⟶ 1 C a _ O ⟶ 2 C a _ O H 2 ⟶ 2 F e _ S O 4 ⟶ 2 F e _ C l 3 ⟶ 3 F e 2 _ O 3 ⟶ 3 N a O H _ ⟶ 1 A l _ O H 3 ⟶ 3 N a 2 _ C o 3 ⟶ 1

E M B I B E

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q H

MEDIUM

7th CBSE

IMPORTANT

Earn 100

Write the formula of each of the following compounds.

Water Calcium oxide Carbon dioxide Carbon monoxide Magnesium oxide

Hydrogen Chloride Sodium chloride Potassium chloride Magnesium chloride Zinc chloride

Nitric acid Sodium nitrate Sodium carbonate Potassium carbonate Calcium carbonate

Water	Calcium oxide	Carbon dioxide	Carbon monoxide	Magnesium oxide
Hydrogen Chloride	Sodium chloride	Potassium chloride	Magnesium chloride	Zinc chloride
Nitric acid	Sodium nitrate	Sodium carbonate	Potassium carbonate	Calcium carbonate

Important Questions on The Language of Chemistry

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7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q A

What does the formula of a substance tell you?

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7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q A

What do you mean by the valency of an element?

EASY

7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q A

What is a group of atoms of two or more elements behaving like an atom and having a valency is called?

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7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q A

Name two elements that have variable valency. Give the formula and name of two compounds formed by each of these elements.

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IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q A

What is balanced chemical equation? Why should a chemical equation be balanced?

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7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q B

Find the valences of the underlined elements or radicals in the following compounds.

\underline{B a} C l_{2}, \underline{P} C l_{3}, \underline{P} C l_{5}, \underline{N} H_{3}, M g \underline{S O_{4}}, C a \underline{C O_{3}}, \underline{N a_{2}} O, \underline{C a} O, \underline{C a} {(O H)}_{2}, \underline{F e} S O_{4},

\underline{F e} C l_{3}, \underline{F e_{2}} O_{3}, N a \underline{O H}, \underline{A l} {(O H)}_{3}, \underline{N a_{2}} C o_{3}

HARD

7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q C

What are compound radicals? Give examples of a few radicals, along with their valences. Also mention some compounds containing compound radicals. Give the valencies of the parts that make up the compound.

EASY

7th CBSE

IMPORTANT

Basic Science For Class 7>Chapter 1 - The Language of Chemistry>Exercises>Q D

A _____ is an abbreviation of the name of an element.