with a release of energy. CHEMICAL BONDING - 10 ICSE CHAPTER WISE QUESTIONS 2. Lesson 5 recaps the various models of bonding. Study of Acids, Bases and Salts. Electrolytes, Non-Electrolytes and Electrolysis. Answer: Sodium ion has eight electrons in its valency shell and it is the minimum state of energy, while the sodium metal has one electron in valency shell, so the sodium metal is very reactive. (i) Classify the elements as metals and non-metals. In other words the number of molecules per unit volume is less. Why ? (iii) Except for graphite, covalent compounds are bad conductors of electricity. (iii) Electrovalent compounds have high density with high melting and boiling points. Answer: In the formation of a cation, the atom loses the electrons of its outer shell. The electrons of lone pair on N-atom are donated to H+ ion and thus a N/EH co-ordinate bond is established in NH4+ ion. this chemistry blog is for 10 class icse, cbse and pg students; main contents of this blog are (1) 10th class chapter wise questions, past papers, tips and video lecture on hard topics. Chapter 10: Chemical Bonding Ch 10 Page 1 . (vi) Many covalent compounds exhibit various types of isomerism. Answer: (i) (d) (ii) (a) Co-ordinate bond. Properties: (i) It is hard and brittle. Answer: The cause of chemical combination between atoms of the various elements is their tendency to acquire nearest stable noble gas configuration of octet of electrons and duplet of electrons in case of hydrogen atoms in their outermost shells. Their is a great electrostatic force of attraction among these oppositely charged ions and as a result, ionic compounds form hard crystals. Published on 1/20/2015 6:28:00 PM. Rhushikesh Shende. They are insoluble in water but are usually soluble in organic solvents, such as benzene, chloroform etc. All exercise questions are solved & explained by expert teacher and as per ICSE board guidelines. VIEWS. Answer: When the sodium chloride crystals come in contact with water, they are bombarded by water molecules from all possible directions. ICSE Class 10 Chemistry Chapters for Multiple Choice Questions ... Chemical Bonding - Ionic Compounds and Covalent Compounds. Question 13: Why molten NaCl conduct electricity but, CCl4 does not ? Is it like humans wherein they just get attracted? MCQs on Chemical Bonding and Molecular Structure for NEET Except for noble gases, no other elements occur independently. Answer: Formation of hydronium ion: The type of bonding present in hydronium ion is co-ordinate bonding. Kossel-Lewis Approach to Chemical Bonding It donates its valence electron, the residual ion consists of a single proton. Study class 10 Chemical Bonding notes & practice icse board papers to … Any such aggregation in which atoms are held together and which is electrically neutral is called a molecule. In what kind of compound does this effect occur ? There are three types of Chemical Bonds : 1) Electrovalent(ionic) Bond is formed as a result of the transfer of electrons from one atom of an element to one atom of another element. Chemical Bonding and Molecular Structure Class 11 Notes Chemistry Chapter 4 • Chemical Bond The force that holds different atoms in a molecule is called chemical bond. Give four properties of XY2. Answer: Question 9: (i) Give one property of hydrogen chloride which agrees with it being a covalent compound. 011-40705070 or Call me PURCHASE. Question 8: By drawing an electron dot diagram, show the lone pair effect leading to the formation of ammonium ion from ammonia gas and hydrogen ion. Electro-negativity of hydrogen = 2.1, Question 2: With the help of the figure Show HCl is-a polar molecule. Question 17: Why covalent compounds have low melting point and boiling point ? What is a lone pair of electrons. Question 20: Predict the type of bonding in the following molecules : (i) Oxygen (ii) Calcium oxide (iii) Water (iv) Methane (v) Ammonium ion (vi) Nitrogen (vii) Magnesium chloride (viii) Carbon dioxide (ix) Carbon tetra chloride (xi) Hydrogen cyanide (x) Hydrogen chloride Answer: (i) Covalent bond (ii) Ionic bond (iii) Covalent bond (iv) Covalent bond (v) Covalent bond (vi) Ionic bond (vii) Covalent bond (viii) Covalent bond (ix) Covalent bond (xi) Covalent and co-ordinate bonds (x) Covalent bond, Question 1: With the help of the figure, explain that methane molecule is a non-polar covalent compound ? A presentation to teach chemial bonding easily. Answer: (i) Y will form an anion (ii) Z forms a cation (iii) X has four electrons in its valence shell. Chemical Bonding is the Most important Chapter in ICSE Class 10 Chemistry. This makes the shell expand outward. (iii) An electrostatic force of attraction exist between the oppositely charged ions. (ii) Covalent compounds have low melting or boiling points. This is second set of fill in the blanks test on Chemical Bonding. For these reasons the anion is bigger than the parent atom. Question 4: What are the salient features of electrovalency ? In this session, Krishnamoorthy Ramakunja (km sir) will discuss about Chemical Bonding, Class 11 NCERT Chemistry. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Let's learn about Chemical Bonding and Molecular Structure in detail. In NH3 molecule each of three H-atoms is linked to N-atom by a covalent bond. Answer: In covalent compounds, the molecules are held together by weak Van der Waal’s forces. Instruction for Exercise. 10th Class Chapter No 17 - Chemical Bonding in Science for ICSE . (iv) In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidised and the substance that is reduced. Answer: Lone pair of electrons is the unshared pair of electrons left on the atom in a covalent molecule Question 2. This is similar to the formation of ionic bond. Question 18: (i) Which of the following is not a common characteristic of an electrovalent compound ? (a) A chemical bond may be defined as the force of attraction between any two atoms, in a molecule, to maintain stability. Answer: The bond in XY2 is ionic. Answer: A co-ordinate bond is a union of one electrovalent and one covalent bond, the volatility of these compounds lies between that of covalent and ionic compounds. They were the first to provide A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. Metals react with non-metals to form ionic compounds by ____. Question 12: Why ionic compounds are generally soluble in water, but insoluble in organic solvents ? Thus mass per unit is also less and hence, covalent compound have low density. Answer: Formation of Hydronium ion, H3O+ : This ion formed by the combination of H2O molecule and H+ ion. A molecule is formed if it is more stable and has lower energy than the individual atoms. We have provided Chemical Bonding and Molecular Structure Class 11 Chemistry MCQs Questions with Answers to help students … Answer: (ii) Because carbon tetrachloride is non-polar covalent compound whereas water is a polar covalent solvent. Total number of questions in this exercise are 40. 1. If the alignment of a water molecule is such that slightly negative oxygen atom faces the slightly positive hydrogen atom of HCl then, the slightly positive hydrogen atom is swallowed by water molecule in the form of single proton to form hydronium ion (H+3O). 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