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 A

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

Important Questions on The Language of Chemistry

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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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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}

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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.

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

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

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

A molecule of an element or a compound is represented by its _____. (Valency/ formula)

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