(a) 2 Explain it with two examples. Which of the following weighs the most? In the Kelvin scale, the lowest possible temperature is 0 K. This reading is called absolute zero; however, nothing could possibly ever reach this temperature. (c) One mole of sodium (c) Fahrenheit The empirical formula of the compound would be (b) 0.2 M (ii) Both A and R are true but R is not the correct explanation of A. (c) 17.8 Question 17. 28g CO Given that: – 6.0 g. Thus (6.0 g)/ (12.0 gmol-1) = 0.50 mol. = 3 × 6.02 × 1023 ions 20. = 0.05 M, Question 13. CBSE Class 11 - Chemistry - CH1 - Mole Concept Q1: Define mole Answer : A mole (or mol) is defined as the amount of substance which contains equal number of particles (atoms / molecules / ions) as there are atoms in exactly 12.000g of carbon-12. Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. NCERT Exemplar Class 11 Chemistry is very important resource for students preparing for XI Board Examination. Explanation: Also Access CBSE Class 11 chemistry Sample Papers. The S.I unit of temperature is : (b) One mole of water (A) In Agriculture and Food: (i) It has provided chemical fertilizers such as urea, calcium phosphate, … (b) One mole of water Chemistry Important Questions Class 11 are given below. Here you can get Class 11 Important Questions Chemistry based on NCERT Text book for Class XI. At an intermediate level, it is not so easy. of NO–2 Explanation: (a) 0.1 N (b) 5 Sulphuric acid reacts with sodium hydroxide as follows : Which of the following pairs have the same number of atoms? 2. 1 Some Basic Concepts of Chemistry MCQs. It is compulsory for those who choose the science group. (b) Cation How is the mole defined? Or 90.13 m = (222 × 9.87) One becomes positive because it lost an electron, and the other negative because it got another electron. = 3 moles. (ii) Both A and R are true but R is not a correct explanation of A. Free NCERT Solutions for Class 11 Chemistry Chapter 1 Some basic Concepts of Chemistry solved by expert teachers from latest edition books and as per NCERT (CBSE) guidelines.Class 11 Chemistry Some basic Concepts of Chemistry NCERT Solutions and Extra Questions with Solutions to help you to revise complete Syllabus and Score More marks. So number of ions in 111g/mol of CaCl2 In the definition of mole, the number of elementary entities present in a substance is compared with ____. Answer: (c) Three Mole Free PDF download of Important Questions for CBSE Class 11 Chemistry Chapter 12 - Organic Chemistry - Some Basic Principles and Techniques prepared by expert Chemistry teachers from latest edition of CBSE(NCERT) books. (i) Both A and R are true but R is not the correct explanation of A. (d) 3.0 N, Question 18. (iii) Amount of Fe 2 O 3 can be increased by taking any one of the reactants (iron or oxygen) in excess. Multiple Choice Questions (MCQ) for CBSE Class 11-science Chemistry chapters on Topperlearning. Molecular weight of 12C atoms have a mass of 12.0 g. (a) One g – atom of nitrogen (d) Torr. (Number of carbon atoms = moles of compound × number of C atoms per mol × Avogadro number) (d) Mass … NA (Avogadros number = 6.022 × 1023) These MCQ's are extremely critical for all CBSE students to score better marks. (a) Bar In the following questions two or more options may be correct. To ease the pressure students must go for the textbook solutions as these clear the basics and also explains the entire chapter in the form of question and answers. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. of molecules in 111g/mol of CaCl2 = Avogadros number Which of the following solutions have the same concentration? CBSE Important Questions Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry. (c) 6 Question from very important topics are covered by NCERT Exemplar Class 11. (d) Ag+, Answer: (c) Pb2+ (a) One Mole (b) 20 ml The density of 3 molal solution of NaOH is 1.110 g mL. Or m = (222 × 9.87)/(90.13) (c) 5 Explanation: HNO 3 (3) 70.0 g conc. Hence % of M= [(m)/ (m+222)] × 100 = 9.87(given) FSC students with pre-medical and pre-engineering studies are asked to study chemistry subjects. Question 16. Free Question Bank for NEET Chemistry Some Basic Concepts of Chemistry Answer: (b) 0.5 Answer: (d) 26.7 Question 8. High quality research in physical chemistry, chemical physics and biophysical chemistry. Assertion (A) : The empirical mass of ethene is half of its molecular mass. 1. Thus, some water molecules may be evaporated at high temp. Explanation: (c) Atomicity Which of the following reactions is not correct according to the law of conservation of mass. We hope the given NCERT MCQ Questions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry with Answers Pdf free download will help you. What will this reading be on Celsius scale? Question 3. So N = 3M = 0.5 × NA =0.5NA (NA is Avogadro number) There are some basic concepts which help us to understand chemistry better. (1) 45.0 g conc. An organic compound contains carbon , hydrogen and oxygen. CBSE 11 Chemistry 01 Some Basic Concepts of Chemistry 28 Topics | 29 Quizzes 01.21 Empirical Formula and Molecular Formula 1.21 Empirical Formula and Molecular Formula. Answer: (a) Anion = 0.05 M, Question 4. Moles = (8/16) = 0.5 mol Answer: (b) 20 ml (b) 0.5 (d) 0.25 M, Answer: (b) 0.2 M (d) 1. Atomic weight = (Equivalent weight × Valency) Or (b) 0.5 We can get the answers of many such questions with the help of basic concepts of chemistry (Chapter 1 of Class 11). Question 5. Number of carbon atoms = 0.2 × 2 × NA = 0.4 NA 21g propane (C3H8) What is the difference between molality and molarity? The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Structure of Atom. The molar mass of In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Which of the following terms are unitless? Jan 18, 2021 - #150 MCQs PDF on "Some basic concepts of Chemistry " [Neet /Aiims/Jee] MBBS Notes | EduRev is made by best teachers of MBBS. In the reaction 2A + 4B → 3C + 4D, when 5 moles of A react with 6 moles of B, then, Match the following physical quantities with units. Under similar conditions of pressure and temperature, 40 ml of slightly moist hydrogen chloride gas is mixed with 20 ml of ammonia gas, the final volume of gas at the same temperature and pressure will be (c) 21.0 g Propane The test consists 30 questions. Check the below NCERT MCQ Questions for Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry with Answers Pdf free download. One mole of oxygen gas at STP is equal to _______. Instructions:-All the questions are compulsory. NEET 2021 Chemistry syllabus. (a) Fe3+ Ions in one calcium chloride molecule = Ca+2 + 2Cl– = 3 ions Academic Partner. What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water? 12C is 12.0 gmol-1. (c) Kg/m² (b) 8.9 What is the normality of a 1 M solution of H3PO4 The questions includes 1 mark questions, 2 mark questions, 3 mark questions, 4 mark questions, 5 mark questions and other questions as per the latest CBSE curriculum for the current session. (d) 11.3. Two particles that have different numbers of electrons (the smallest particle in an atom which is negative) start reacting to each other. If its equivalent weight is 8.9, the exact atomic weight of element would be b) These multiple choice questions for Chemistry Class 11 will help to improve analytical and complex problem decoding skills. of NO–3 = \(\frac { (0.1) }{ (2) } \) A measured temperature on Fahrenheit scale is 200 °F. (d) One molecule of H2SO4, Question 19. (c) Pb2+ The number of moles present in 6 gms of carbon is: 12C is 12.0 gmol-1. (a) 0.1 M Question 10. If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained? Explanation: Question 14. A symbol not only represents the name of the element but also represents Which of the following element contains the greatest number of atoms? (d) 1. 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