With the increase in atomic size, the number of electron shells increase. Show by a chemical reaction with water that Na20 is a basic oxide and Cl207 is an acidic oxide. (ii) p-Block elements: ns2 np1-6 where n = 2-6. Which one of the following factors does not affect the valence shell? Multiple Choice Questions (MCQ) for CBSE Class 11-science Chemistry chapters on Topperlearning. On moving down the group their reactivity increases. What do you understand by isoelectronic species? Solving the Objective Questions for 12th Class Chemistry helps you be aware of the type of the questions asked in the exam. Answer: (a) Variation of atomic radius in a group: (i)Mg or Ca (ii) S or Cl As a result, the force of attraction of the nucleus for the valence electrons further decreases and hence the ionization enthalpy decreases. to increase in effective nuclear charge from left to right across a period. Question 22. Question 31. Answer: For oxygen atom: Download latest MCQs for Class 11 Chemistry in … Which of the following is arranged in order of increasing radius? Question 19. Class 11 Chemistry Chapter 3 solutions are provided by teachers who have several years of experience and are professional experts in this field. (ii) Radius of anion is more than that of the atom. 1. Multiple Choice Questions will have considerable weightage in … (ii) The electronic configuration of Answer: (i) In case of Be (1s2 2s2) the outermost electron is present in 2s-orbital while in B (1s2 2s2 2p1) it is present in 2p-orbital. (d) The element IV has a high negative electron gain enthalpy (∆egH ) but not so high first ionization enthalpy (∆egH). From left to right across a period atomic radii generally decreases due (f) The element I has low first ionization (∆ iH1) but a very high second ionization enthalpy (∆ iH2), therefore, it must be an alkali metal. M (g) + I.E. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 3 Electrochemistry with Answers Pdf free download. How does it vary along a period and along a group? This principle is used in:(a) Centrifugation(b) Fractional distillation(c) Evaporation(d) Tunneling Answer… After the loss of first electron, the electronic configuration of (a)ionization enthalpy increases for each successive electron. (i) IE1 of sodium is lower than that of magnesium whereas IE2 of sodium is higher than that of magnesium. Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 3 - Classification of Elements and Periodicity in Properties prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. Question 8. Answer: Within a period, the oxidising character increases from left to right. Answer: Question 15. Chapter 4. Answer: The elements of s and p-block are collectively called representative or main group elements. Topics and Subtopics in NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties: NCERT Solutions Class 11 ChemistryChemistry Lab ManualChemistry Sample Papers. Browse further to download free CBSE Class 11 Chemistry Worksheets PDF. Unit of electron gain enthalpy is kJ/ mol. But it is not correct to say that the electronegativity of nitrogen in all the compounds is 3. OUR ANDROID APP [DOWNLOAD FREE] PHYSICS 11 MCQs Chap.1 Measurment Chap.2 Vectors and equilibrium Chap.3 Force and motion Chap.4 Work and energy Chap5 Circular motion chap.6 Fluid Mechanics Chap 7 Oscillation Chap.8 Wave MCQs with solution Chap.9 Physical options Chap.10 Thermodynamics Chemistry lecture trailer CHEMISTRY 11 MCQs Chapter No. Class 10; Chemistry; MCQ; CBSE Class 10, Chemistry, MCQ. Since the metal forms a predominarly stable covalent halide of the formula MX (X = halogen), therefore, the alkali metal must be least reactive. The increasing order of reactivity among group 1 elements is Li < Na < K < Rb < Cs whereas that of group 17 is F > Cl > Br > I. have same No. Thirty two grams of sulphur and 23 grams of sodium contain Avogadroâs number of atoms. Among the following elements, which has the least electron affinity? When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. Ionisation enthalpy =E∞–E ground state We have provided Classification of Elements and Periodicity in Properties Class 11 Chemistry MCQs … The values of ∆ i H1, ∆ iH2 and ∆egH match that of F (fluorine). What is the name of the metal which exists in liquid state at room temperature? Atomic Radii. Students can solve NCERT Class 7 Maths Data Handling MCQs Pdf with Answers to know their preparation level. Question 17. The values of ∆ i H1, ∆ iH2 and ∆egH match that of K (potassium). Whereas electronegativity refers to tendency of the atom of an element to attract shared pair of electrons towards it in a covalent bond. Free NCERT Solutions for Class 11 Chemistry Chapter 3 Classification of Elements and Periodicity in Properties solved by expert teachers from latest edition books and as per NCERT (CBSE) guidelines.Class 11 Chemistry Classification of Elements and Periodicity in Properties NCERT Solutions and Extra Questions with Solutions to help you to revise complete Syllabus … Answer: (i) F2 < Cl2 < 02 < N2 value from B to Al is due to the bigger size of Al. d-block elements: (n -1) d1 -10 ns0- 2 where n = 4 – 7 11th Class Chemistry Chapter 3 Gases online MCQ's Test . Class 10 Science Chapter 3 MCQ (Multiple Choice Questions) of Metals and Non-Metals. The number of atoms present in 0.1 moles of a triatomic gas is. Therefore, the correct sequence of decreasing metallic character is: K > Mg > Al > B, i.e., option (d) is correct. Answer: They have fully filled s-orbitals and hence have no tendency to accept an additional electron. Atomic mass of Na =(39+7)/2= 23 Discuss the main features of long form of the periodic table. Question 3. (a) Phosphorous (b) Oxygen (c) Sulphur (d) Nitrogen (c) The ionization energy of the element (d) Oxidizing power electrons. Answer: Main features of long form of periodic table: Advantages of long form of periodic table: Question 2. Question 8. For example, It is compulsory for those who choose the science group. Variation within a group. Na = 1s2 2s2 2p6 3s1 Ionic radius. Question 1. Answer: (i) Ca (ii) S. Question 9. Ground state of the atom represents the normal – energy state of an atom. (b) Identify the element that would tend to lose two electrons. Answer: The basic theme of organisation of elements in the periodic table is to simplify and systematize the study of the properties of all the elements and millions of their compounds. Give general electronic configuration off-block elements? What is the basic difference in approach between Mendeleev’s Periodic Law and the Modem Periodic Law? Under what conditions of temperature and pressure will a real gas behave most like an ideal gas? Consequently, the force of attraction by the nucleus for the valence shell electrons decreases and hence the ionization enthalpy decreases. f-block elements: (n – 2)f0-14(n -1) d0-1 ns2 where n = 6 – 7, Question 5. (b) Arrange them in order of increasing ionic radii? 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Therefore, it appears that the element is an alkaline earth metal and hence will form binary halide of the formula MX2(where X = halogen). (a) How does atomic radius vary in group in the periodic table? What are the advantages of long . Electronic configuration[Xe] 4 f7 5d1 6s2.with fluorine it will form a binary compound = Lu F3. A solid has a definite shape and volume. If all measurements are made at the same temperature what is the pressure in the combined arrangement after connection? Therefore, electron gain enthalpies of Be and Mg are positive. Energy of an electron in the ground state of the hydrogen atom is- 2.18 x 10-18 J.Calculate the ionization enthalpy of atomic hydrogen in terms of JMol-1. Answer: Statement (b) is incorrect. (d) none of the factors because their size is the same At this page you will find Multiple Choice Questions or MCQs for all Chapters of Chemistry Class 11 and 12. The ionization enthalpies keep on decreasing regularly as we move down a group from one element to the other. Give general electronic configuration of each block. With the help of it, candidates can prepare well for the examination . Multiple Choice Questions (MCQ) for CBSE Class 11-science all subjects on Topperlearning. These FSc part 1 biology notes include detailed MCQs notes of Chapter 3 Enzymes. For example: This process may be represented as M (g) + ∆iH -> M+ (g) + e–(g) NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. Maths MCQs for Class 7 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. CBSE Class 11 Chemistry Chemical Bonding MCQs. (a) F > Cl> O > N (b) F > O > Cl> N (c) Cl> F > O > N (d) O > F > N > Cl Answer: Question 8. For example, In contrast,Cl207 reacts with water to form perchloric acid which turns blue litmus red. Answer: Mendeleev used atomic weight as the basis of classification of elements in the periodic table. It means electrons in a particular atom are in the lowest energy state and they neither lose nor gain electron. Therefore, there is an unexpected increase in the magnitude of effective nuclear charge resulting in increased ∆iH1 values. O– (g) + e– —> O 2- (g) (∆ eg H = + 780 kJ mol -1) The tendency to lose electrons in turn, depends upon the ionization enthalpy. 20 Questions. (b)The greatest increase in ionization enthalpy is experienced on removal of electrons from core noble gas configuration. The element is Lutenium (Lu). Answer: Modem Periodic Law states that physical and chemical properties of the elements are a periodic function of their atomic numbers. Is called joule Thomson effect values of ∆ i H1, ∆ iH2 and ∆egH match that of Mg magnesium. Electronic with each of the following is arranged in order of increasing radius the! 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