Match the following:- Column I Column II (Elements) (Symbol) (i) Acidic Radicals K + , Na + (ii) Basic Radicals Fe 2 + , Fe 3 + (iii) Monovalent Radicals CO 3 2 - , SO 4 2 - (iv) Variable Valency Cl - , K + (v) Tetravalent elements Pb 4 + , Pt 4 +

Acidic Radicals and Basic Radicals :- Negatively charged radicals are called acidic radicals . Positively charged radicals are called basic radicals . Acid radicals are formed by the removal of hydrogen ion ( H + ) . Basic radicals are formed by the removal of hydroxide ion ( OH - ) . Monovalent Radical:- A radical formally derived by the removal of one hydrogen atom from any position of any other parent hydride, is named by adding the suffix "-yl" to the name of the parent hydride, eliding the final "e" of the name of the parent hydride. Variable valency :- This property is called as variable valency. Some elements show variable valency because of the different electronic configurations. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. loss from the penultimate shell and hence exhibit more than 1 or variable valency. Tetravalent elements are those elements which have a valency of four i.e. have four electrons in the outermost shell. Examples are the elements belonging to group 14 like carbon , silicon , germanium etc. The symbol of radicals are - Column I Column II (Elements) (Symbol) (i) Acidic Radicals CO 3 2 - , SO 4 2 - (ii) Basic Radicals K + , Na + (iii) Monovalent Radicals Cl - , K + (iv) Variable Valency Fe 2 + , Fe 3 + (v) Tetravalent elements Pb 4 + , Pt 4 +

E M B I B E

TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 5

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Write the symbol for Mercury.

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Important Questions on The Language of Chemistry

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 5

Write symbol for Silver.

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 6

Define variable valency with two examples.

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 7

The formula of Ferric sulphate is

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 7

The symbol for Nitrate ion is

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 7

Write the correct answer.

The Formula for Magnesium Nitride.

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 7

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The valency of iron in $FeO$ .

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 7

Write the correct answer.

The two formulae for chlorides of phosphorus are.

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TOGETHER WITH CHEMISTRY>Chapter 1 - The Language of Chemistry>Self Evaluation Test>Q 8

Match the following:-

	Column I	Column II
	(Elements)	(Symbol)
(i)	Acidic Radicals	$K^{+}, {Na}^{+}$
(ii)	Basic Radicals	${Fe}^{2 +}, {Fe}^{3 +}$
(iii)	Monovalent Radicals	${CO}_{3}^{2 -}, {SO}_{4}^{2 -}$
(iv)	Variable Valency	${Cl}^{-}, K^{+}$
(v)	Tetravalent elements	${Pb}^{4 +}, {Pt}^{4 +}$

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