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 +

Balance the Chemical Equation K 2 Cr 2 O 7 + HCl → CrCl 3 + Cl 2 + KCl + H 2 O

An oxidation - reduction ( redox ) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation - reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. 6 Cl - 1 - 6 e - → 6 Cl 0 (oxidation) 2 Cr 4 + + 6 e - → 2 Cr 3 + (reduction) HCl is a reducing agent, K 2 Cr 2 O 7 is an oxidizing agent. K 2 Cr 2 O 7 + 14 HCl → 2 CrCl 3 + 3 Cl 2 + 2 KCl + 7 H 2 O

E M B I B E

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

EASY

9th ICSE

IMPORTANT

Earn 100

Write symbol for Silver.

50% studentsanswered this correctly

Important Questions on The Language of Chemistry

EASY

9th ICSE

IMPORTANT

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

Define variable valency with two examples.

EASY

9th ICSE

IMPORTANT

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

The formula of Ferric sulphate is

EASY

9th ICSE

IMPORTANT

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

The symbol for Nitrate ion is

EASY

9th ICSE

IMPORTANT

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

Write the correct answer.

The Formula for Magnesium Nitride.

EASY

9th ICSE

IMPORTANT

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

Write the correct answer.

The valency of iron in $FeO$ .

EASY

9th ICSE

IMPORTANT

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.

EASY

9th ICSE

IMPORTANT

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	${Pb}^{4 +}, {Pt}^{4 +}$