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CBSE Class 11 Pre Board 2021 : Chemistry - Annual Final (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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Annual Examination, 2020-2021 CHEMISTRY Grade: 11 Time: 3 Hours Date: 10.02.2021 Max. Marks: 70 General Instructions. (i) There are 33 questions in this question paper. All questions are compulsory. (ii) Section A: Question numbers 1 to 2 are case-based questions having MCQs or Reason Assertion type based on given passage each carrying 1 mark. (iii) Section A, Question numbers 3 to 16 are MCQs and Reason Assertion type questions carrying 1 mark each. (iv) Section B, Question numbers 17 to 25 are short-answer questions and carry 2 marks each. (v) Section C, Question numbers 26 to 30 are also short-answer questions and carry 3 marks each. (vi) Section D, Question numbers 31 to 33 are long answer questions and carry 5 marks each. (vii) There is no overall choice. However, internal choices have been provided. (viii) Use Log Tables, if necessary. Use of calculators is not allowed Section A 1. i. Read the given passage and answer the following questions: The properties of elements such as atomic or ionic radii, ionization enthalpy, electron gain enthalpy and electronegativity are directly or indirectly related to their electronic configuration and are called periodic properties. A part of the periodic table is given below: C N O F P S Cl Se Br I Which of the following has highest ionization enthalpy? a) N ii. c) O d) C Bromine belongs to period: a) third iii. b) P b) fourth 1 c) fifth d) second As compared to nitrogen, oxygen is: a) b) c) d) 1 less electronegative and less reactive. more electronegative and less reactive. more electronegative and more reactive. less electronegative and more reactive. Page 1 of 9 1

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