Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 4 - Chemical Bonding and Molecular Structure prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. Question 17: Why covalent compounds have low melting point and boiling point ? Question 15: Which conditions are necessary for the formation of co-ordinate bond? Chemical bonding and molecular structure grade 11 1. In NH3 molecule each of three H-atoms is linked to N-atom by a covalent bond. Question 4: Why a molecule of hydrogen is more stable than the uncombined atoms ? The arrow points from donor to acceptor atom. Answer: Formation of Hydronium ion, H3O+ : This ion formed by the combination of H2O molecule and H+ ion. Chemical Bonding Class 11 Notes In class 11 students will come across the topic of chemical bonding in chapter 4 of the chemistry textbook. Set 1 Question 3: On what factors the formation of an electrovalent compound depends ? Question 11: Elements X, Y and Z have atomic number 6, 9 and 12 respectively. Register online for Chemistry tuition on Vedantu.com to score more marks in your examination. Answer: A covalent bond between two atoms is non-polar if the electrons involved in bond formation are equally shared between two atoms having similar electronegativities. Noble gases are considered stable because they do not react with other elements. Chemical Bonding ,Chemical Bonding and Molecular Structure - Get topics notes, Online test, Video lectures, Doubts and Solutions for CBSE Class 11-science on TopperLearning. Thus, the cation has one electron shell less than the atom, from which it is formed. Draw the structure of these positive ions. In what kind of compound does this effect occur ? (iv) No. (ii) Give one property of magnesium chloride which agrees with it being an ionic compound. The ions drift in water in all possible directions and hence, ionic compounds dissolve in water, while organic solvents are non-polar in nature and hence, cannot break the ionic bonds. Thus, the ionic compounds do not dissolve in them. Under normal conditions, which physical state will the compound QS exist in ? Answer: Lone pair of electrons is the unshared pair of electrons left on the atom in a covalent molecule Question 2. Because to form an ionic compound if one element gives electrons, the other element should accept electrons. CC bond length is shorter than C=C bond which in turn is shorter than C-C. Polar cgvalent compounds are however soluble in polar solvents. (vi) These are stable compounds. What is the nature of bond to XY2 ? Four of the stations are considered input stations where students are learning new information about chemical bonding, and four of the stations are output stations where students will be demonstrating their mastery of the input stations. If sufficient number of water molecules strike a particular chloride ion in same fashion, then it can be pulled out of the crystal of sodium chloride to form free chloride ion. Answer: The formation of an ionic compound depends on the following factors: (i) Low ionisation energy: Lesser is the ionisation energy of an atom, greater will be its tendency to form cation by losing the valence electron. Thus, a chemical bond is defined as a force that acts between two or more atoms to hold them together as a stable molecule. We Provide Step by Step Answer of Exercise-2, with Intex -1, Intex-2 and Previous Year Questions of Exercise-2 Chemical Bonding ICSE Class-10 . Answer: In HCl molecule the strong nuclear charge of chlorine atom attracts the electron of hydrogen far away from its nucleus, with the result the hydrogen atom develops a slight positive charge (d+) and chlorine atom develops a slight negative charge (d–). In such a configuration, none of the participating atoms is more electrically charged as compared to other atoms. Answer: The force of attraction between the molecules is very weak and so the amount of energy needed to separate them is small, consequently they have low melting points and boiling points. The attractive forces which holds various constituents such as atoms molecules and ions together in different chemical species is called a covalent bond A covalent bond includes the … . Question 21: Why is methane molecule regarded as a non-polar covalent compound ? Marks and answers are given immediately. The three dimensional structure of methane molecule has the carbon atom at the centre of the tetrahedron and four hydrogen atoms are located at the corners of the tetrahedron. Hence, it is a covalent compound. Question 2: Write the general characteristics of electrovalent compounds. This test is totally based on latest Chemistry textbook of ICSE Board. (iv) There is one fixed direction in space among the ions. The force is termed as a chemical bonds. (ii) Electrovalent compounds form hard crystals. (iii) The electronic configuration of nitrogen is 2, 5. Answer: (i) Hydrogen chloride is a gas at room temperature and in dry state it is a bad conductor of electricity. Choose […] (ii) Explain why Carbon tetrachloride does not dissolve in water. Question 13: How is a co-ordinate bond formed? Explore the causes, effects, and solutions to ozone layer depletion only at BYJU'S. Most of the substances found in nature are in the form of clusters or aggregates of atoms. In order to attain a minimum state of energy, i.e., to acquire a duplet or octet structure in their valence shell, they either donate or accept electrons. This is called octet rule. The following section consists of Chemistry Multiple Choice questions on Chemical Bonding For competitions and exams. all rights reserved. Question 5: Draw dot diagrams to illustrate the structure of the molecules of: (i) Ammonia (ii) Carbon dioxide (iii) Methane (iv) Water Answer: Question 6: Give the electron dot structures of: (i) NaCl (ii) MgCl2 (iii) CaO (iv) Cl2 (v) H2O (iv) NH3 Answer: Question 7: Draw an electron dot diagram to show the structure of hydronium ion. 1Å = 10-10m and 1pm = 10-12 m. It is determined with the help of X-rays diffraction and other spectroscopic methods. Question 20: Why hydrogen chloride can be termed as a polar covalent compound ? (iii) Solid state. RS Aggarwal Solutions for class 7 Math's, lakhmirsingh Solution for class 8 Science, PS Verma and VK Agarwal Biology class 9 solutions, Lakhmir Singh Chemistry Class 9 Solutions, CBSE Important Questions for Class 9 Math's pdf, MCQ Questions for class 9 Science with Answers, Important Questions for class 12 Chemistry, Important Questions CBSE Class 10 Science. Whereas Liquid CCl4 does not contain any charged particles to conduct electricity. Question 19: (i) Acids dissolve in water to produce positively charged ions. Question 19: Why do covalent compounds exist as gases, liquids or soft solids ? CHEMICAL BOND- the chemical force which keeps the atoms in any molecule together is called a chemical bond. Answer: Formation of hydronium ion: The type of bonding present in hydronium ion is co-ordinate bonding. APlusTopper.com provides ICSE Solutions for Class 10 Chemistry Chapter 2 Chemical Bonding for ICSE Board Examinations. Here we have covered Important Questions on Chemical Bonding and Molecular Structure for Class 11 Chemistry subject.. Chemistry Important Questions Class 11 are given below. Answer: The covalent compounds do not have positive or negative ions in their fused state. It is defined as the attractive forces which hold the various chemical constituents (atoms, ions, etc.) For example: A fluorine atom has seven valence electrons. In the second step the two electrons, one each with A and B- are shared by both the ions. As the number of electrons in the outer shell is increased, the repulsion between them increases. Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI.Chemistry Class 11 Important Questions are very helpful to score high marks in board exams. A molecule is formed if it is more stable and has lower energy than the individual atoms. However, if you experience any difficulties, follow the following steps: 1.) Due to these strong forces of attraction, ionic compounds have high melting and boiling points and low volatility. Just follow the NCERT Textbook. Thus, there are large inter molecular spaces between the molecules. Metals with lower ionisation energy values have a greater tendency to form ionic bonds. These crystals are usually brittle. Answer: The crystals of electrovalent compounds are made up of crystal lattice containing oppositely charged ions. To begin, students: Complete the Chemical Bond Properties Chart - BLANK document. Answer: Covalent compounds exists as gases, liquids or soft solids because they have weak forces of attraction between their molecules. Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. (ii) 2 (iii) Covalent (iv). Atoms of different elements take part in chemical combination in order to complete … You can download the Class 10 Chemistry ICSE Textbook Solutions with Free PDF download option. Lone pair effect is shpwn by polar covalent compounds such as HCl and NH3. (iv) Can Q and S, both be metals ? This makes the shell expand outward. These ions occupy fixed position in the crystals and do not move when an electric field is applied. 2) Covalent Bond: The chemical bond formed between two combining atoms by mutual sharing of one or more pairs of electrons. Why ? (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: The general characteristics of co-ordinate compounds are as follows: (i) Co-ordinate compounds are identical to normal covalent compounds. Chapter 10: Chemical Bonding Ch 10 Page 1 . Question 2: Why do certain elements form ions ? For example, in case of methane molecule, the four electron pairs shared between one carbon atom and four hydrogen atoms lie exactly in between one carbon atom and four hydrogen atoms and hence forms non-polar bonds. 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. For webquest or practice, print a copy of this quiz at the Chemistry: Chemical Bonding webquest print page. The arrow represents a co-ordinate bond. Practice for next class: Bond Polarity One atom pulls the electrons in the bond closer to its side. with a release of energy. (iii) It has high melting and boiling point. Question 16: Why all covalent compounds are bad conductor of electricity ? Electro-negativity of hydrogen = 2.1, Question 2: With the help of the figure Show HCl is-a polar molecule. (iv) Which property of the above compound agrees with the being of a covalent compound ? Answer: There is a strong force of attraction among the oppositely charged ions in the crystals of electrovalent compounds. Atoms enter into chemical bonding to acquire the stable inert gas electronic configuration. The water molecule has two O—H covalent bonds and central oxygen atom has two lone pairs of electrons. Which are : (i) forms an anion (ii) forms a cation ? Question 17: What is lone pair effect ? Thus in this molecule N-atom is left with a lone pair of electrons after completing its. octet by sharing three of its valence shell electrons with three H-atoms. Further, since the number of protons remains the same as in the neutral atom, the nucleus attracts the increased number of electrons less strongly. H+ ion has one vacant ls-orbital. State the following : (i) the outer electronic configuration of Y. Back to Science for Kids together in different chemical species. (iv) Electrovalent compounds are soluble in polar solvents. Chemical bond:- Chemical bond is the attractive force which holds various constituents together in … 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 ? 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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