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Concise Chemistry for Class 10: Please click alongside the chapters to go to important questions along with answers :-  Chapter 1 Periodic Table, Periodic Properties and Variations of Properties:  http://periodic-table-periodic Chapter 2 Chemical Bonding:  http://chemical-bonding Chapter 3 Acids, Bases and Salts:  http://acids-bases-and-salts Chapter 4 Analytical Chemistry: Uses Of Ammonium Hydroxide And Sodium Hydroxide:  http://analytical-chemistry Chapter 5 Mole Concept and Stoichiometry:  http://mole-concept-and-stoichiometry Chapter 6 Electrolysis:  http://electrolysis Chapter 7 Metallurgy:  http://metallurgy Chapter 8 Study of Compounds – Hydrogen Chloride:  http://study-of-compounds-HCl Chapter 9 Study of Compounds – Ammonia:  http://study-of-compounds-ammonia Chapter 10 Nitric Acid:  http://chapter-10-nitric-acid Chapter 11 Sulphuric Acid:  http://sulphuric-acid Chapter 12 Organic Chemistry:  http://organic-chemist...

Selina Concise Chemistry Class 10 Chemical Bonding Exercise Intext 1 1. How do atoms attain noble gas configuration? Solution 1. Atoms lose, gain or share electrons to attain noble gas configuration. 2.Define (a) a chemical bond (b) an electrovalent bond (c) a covalent bond Solution 2. (a) A chemical bond may be defined as the force of attraction between any two atoms, in a molecule, to maintain stability. (b) The chemical bond formed between two atoms by transfer of one or more electrons from the atom of a metallic electropositive element to an atom of a non-metallic electronegative element. (c) The chemical bond formed due to mutual sharing of electrons between the given pairs of atoms of non-metallic elements is called as a covalent bond. 3.What are the conditions for formation of an electrovalent bond? Solution 3. Conditions for  formation of Ionic bond  are: 1.  The atom which changes into cation should possess 1, 2 or 3 valency electrons. The other atom which c...

Concise Chemistry for Class 10 Chapter 1 Periodic Table, Periodic Properties and Variations of Properties:  Exercise   1. Solution 1. (a) The modern periodic law states that “The properties of elements are the periodic functions of their atomic number.” Henry Moseley put forward the  modern periodic law. (b) A tabular arrangement of the elements in groups (vertical columns) and periods (horizontal rows) highlighting the regular trends in properties of elements is called a Periodic Table. Modern Periodic table has 7 periods and 18 groups. 2. Elements of group 1 and elements of group 17 both have valency1. Explain. Solution 2. Valency is the combining capacity of the atom of an element. It is equal to the number of electrons an atom can donate or accept or share. It is just a number and does not have a positive or negative sign. Group 1elements have 1 electron in their outermost orbital, while Group 7 elements have 7 electrons in their outermost orbital. Valency depends on ...