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ISC Class Board Exam 2021 : Chemistry

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Nisha Boweri
Andhra University (AU), Visakhapatnam
Mech engg

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ALWARDAS PUBLIC SCHOOL VISAKHAPATNAM HALF YEARLY EXAMINATION 2020 CHEMISTRY PAPER-I (THEORY) Question Paper Internal Assessment Total CLASS: XI (TIME ALLOWED: THREE HOURS) Date:05.11 .19 ( Candidates are allowed additional 15 minutes for only reading the paper.) They must not start writing during this time. ---------------------------------------------------------------------------------------------------------------All questions are compulsory Question 1 is of 20 marks having four sub parts, all of which are compulsory. Question numbers 2 to 8 carry 2 marks each, with any two questions having internal choice. Question numbers 9 to15 carry 3 marks each, with any two questions having internal choice. Question numbers 16 to 18 carry 5 marks each, with an internal choice. All working, including rough work, should be done on the same sheet as, and adjacent to the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ]. Balanced equations must be given wherever possible and diagrams where they are helpful. When solving numerical problems all essential working must be shown. In working out problems use the following data: Gas constant R=1.987 cal deg -1 mol -1 = 8.314 Jk-1 mol-1 = 0.0821 dm3 atm k-1mol-1 1 l atm= 1 dm3 atm=101.3J1 Faraday=96500 coulombs. Avogadro s no=6.023x1023 ----------------------------------------------------------------------------------------------------------------Question 1 a) Fill in the blanks by choosing the appropriate word/ words from those given in the brackets: [4] ( covalency, orbital,sub shells, electrovalency, shell, cation, , anion, +2, -2 ) i)--------------- is the number of electrons lost or gained by an element to form an ion. ii) Magnetic quantum number is used to represent ------------- of which a given subshell is composed. iii)--------------- is bigger in size than its parent atom. iv)The oxidation state of group 2 element is-------------. b) Complete the following statements by selecting the correct alternatives from the choices given: [4] i) Bromine belongs to group ---------------------1) group 14 2) 15 3) 16 4) 17 /70 /30 /100

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