H #1s^1# He #1s^2# Li #1s^2 2s^1# Be #1s^2 2s^2# B #1s^2 2s^2 2p^1# C #1s^2 2s^2 2p^2# N #1s^2 2s^2 2p^3# O #1s^2 2s^2 2p^4# F #1s^2 2s^2 … Al3+ < Mg2+ < Na+ < F– < O2– < N3–, Tution Teacher | All rights reserved. (i) Write the molecular formula of the compounds formed by these elements individually with hydrogen. Anions gain electrons to become isoelectronic with the noble gas in the same row as the anion. 7.39. Hence, the given species are isoelectronic, i.e N3- has 7+3 = 10 electrons O2- has 8+2= 10 electrons F- has 9+1 = 10 electrons Na+ has 11-1 = 10 electrons Mg2+ has … 1 practice exercise. The electron configuration is the standard notation used to describe the electronic structure of an atom. Methane and the ammonium ion are said to be isoelectronic. (c) Solubility of compounds in water depends on power to form hydrogen bonds with water. What is the effect of the following processes on the bond order in N. (i) Covalent bonds are directional bonds while ionic bonds are nondirectional. answer choices . Describe hybridisation in the case of PCl. Same electron configuration. NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. (i) F – (ii) Ar (iii) Mg 2+ (iv) Rb + Q:-Calculate the temperature of 4.0 mol of a gas occupying 5 dm 3 at 3.32 bar. False. 4.08 Combustion Reactions 5m. (a) Each of the given species (ions) has the same number of electrons (10 electrons). Go Back to Chemistry Home Page Physics Maths Biology. The species CO, CN – and N 2 are: (a) isoelectronic (b) having coordinated bond (c)having polar bond (d) having low bond energies Question 3. ” The term isoelectronic refers to an atom and an ion of a different atom (or two different ions) that have the same electron configuration. Cations lose electrons to become isoelectronic with the noble gas in the previous row (period) on the table. Why is there difference in bond enthalpy of O—H bond in ethanol (C. Match the species in Column I with the type of hybrid orbitals in Column II. Tetramethylammonium (TMA) or (Me 4 N +) is the simplest quaternary ammonium cation, consisting of four methyl groups attached to a central nitrogen atom, and is isoelectronic with neopentane.It is positively charged and can only be isolated in association with a counter-ion.Common salts include tetramethylammonium chloride and tetramethylammonium hydroxide. In the following questions two or more options may be correct. This ion is usually obtained as the following salts: NOClO 4, NOSO 4 H (nitrosylsulfuric acid, more descriptively written ONSO 3 OH) and NOBF 4. What do you understand by isoelectronic species? (i) [NF 3 and BF 3] (ii) [BF 4 – and NH 4 +] (iii) [BCl 3 and BrCl 3] (iv) [NH 3 and NO 3 –]; Polarity in a molecule and hence the dipole moment depends primarily on electronegativity of the constituent atoms and shape of a molecule. (iii) The average formal charge on each oxygen atom is 0.67 units. Which of the following molecular orbitals has maximum number of nodal planes? (b) The S2− ion is isoelectronic with the Ar atom. Which of the following options represents the correct bond order : The electronic configuration of the outer most shell of the most electronegative element is, Amongst the following elements whose electronic configurations are given below, the one having the highest ionisation enthalpy is. Electron Configurations are an organized means of documenting the placement of electrons based upon the energy levels and orbitals groupings of the periodic table.. Which of the following is the radio isotope in this pair ? Cations lose electrons to become isoelectronic with the noble gas in the previous row (period) on the table. Which of the following statements are not correct? Which of the following has the highest dipole moment? (iii) Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period. Which of the following correctly identifies the species associated with peak X and provides a valid justification? In which of the following substances will hydrogen bond be strongest? Which of the following attain the linear structure: Which of the following species have the same shape? (iv) VSEPR Theory can explain the square planar geometry of XeF, Explain the non linear shape of H2S and non planar shape of PCl, Using molecular orbital theory, compare the bond energy and magnetic character of O. ... the charge on the cation is indicated using a Roman numeral in parenthesis immediately following the name of the cation. Among the given species identify the isostructural pairs. Question 2. (b)The sum of the neutrons in all three species is 27. NCERT Exemplar Solutions of Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure. because all the electrons in the species are paired, meaning that their individual magnetic moments would cancel each other. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 11. (c) The sum of the protons in all three species is 28. C) The electrons in a polar bond are found nearer to the more electronegative element. See section I.B.1 for a periodic table view. With two suitable examples explain the difference between an ionic and a covalent bond? (i) Discuss the concept of hybridisation. (ii) Which of these compounds will have the highest dipole moment? (iii) Total number of bonding molecular orbitals will not be same as total number of anti bonding orbitals in dioxygen. To get fastest exam alerts and government job alerts in India, join our Telegram channel. Contents1 Important Questions for CBSE Class 12 Chemistry – The p-Block Elements1.1 PREVIOUS YEARS QUESTIONS1.2 Short Answer Type Questions [I] [2 Marks]1.3 Short Answer Type Questions [II] [3 Marks]1.4 20141.5 Very Short Answer Type Questions [ 1 Mark ]1.6 Short Answer Type Questions [I] [2 Marks]1.7 Short Answer Type Questions [II] [3 Marks]1.8 Long … 2.03a Isoelectronic and Radii 4m. (i) In the formation of dioxygen from oxygen atoms 10 molecular orbitals will be formed. Which of the above compounds will form hydrogen bond with water easily and be more soluble in it. (iii) Hybrid orbitals form stronger bonds than pure orbitals. Number of π bonds and σ bonds in the following structure is–. (i) A and R both are correct, and R is the correct explanation of A. In doing so, we obtain three quantum numbers (n,l,m l), which are the same as the ones obtained from solving the Schrodinger's … (ii) All the molecular orbitals in the dioxygen will be completely filled. Match the species in Column I with the geometry/shape in Column II. Structures of molecules of two compounds are given below : (a) Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intramolecular hydrogen bonding. Name a species that will be isoelectronic with each of the following atoms or ions. Br0 3 – ion has (7 + 3 x 6 + 1) = 26 valence electrons and is isoelectronic as well as iso-structural with noble gas species Xe0 3 which has also 26(8 + 3 x 6) electrons. Here we have covered Important Questions on Chemical Bonding and Molecular Structure for Class 11 Chemistry subject. (ii) Its resonance structure has one C–O single bond and two C=O double bonds. (iv) Number of filled bonding orbitals will be same as number of filled antibonding orbitals. www.njctl.org Periodic Trends Chemistry 19)Of the following species, _____ has the largest radius. Chemistry Important Questions Class 11 are given below. The correct order of increasing length of their radii is . Hence, the given species are isoelectronic, i.e. (iv) NO2 Solution: Option (i) and (ii) are the answers. Two species (atoms, molecules or ions) are isoelectronic if they have exactly the same number and arrangement of electrons (including the distinction between bonding pairs and lone pairs). Answer the questions 14 to 17 on the basis of these configurations. Which of the following angle corresponds to sp2 hybridisation? 4.08a Balance the following equation 3 4m. 1 reading. Which of the following statements is correct? (ii) In canonical structures there is a difference in the arrangement of atoms.