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BISHOP COTTON GIRLS SCHOOL I TERM EXAMINATION JANUARY 2021 CHEMISTRY STD XI 21-1-2021 Max Marks : 70 Reading time:9 AM to 9.10 AM Writing time: 9.10 AM to 12.10 PM Instructions: Your Log in time is 8.45 AM and Uploading time is 12.10 to 12.30 PM. Students are required to read, complete the paper and upload the clear copies of the answer scripts with your name as the pdf file name in the given time on assignment itself as informed earlier. 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 to 15 carry 3 marks each with any two questions having an 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. Balanced equations must be given wherever possible ,and diagrams where they are helpful. When solving numerical problems , all the essential working must be shown. The intended marks for questions or part of questions are given in brackets [ ]. ---------------------------------------------------------------------------------------------------------------------------------------QUESTION-1. (a) Fill in the blanks with appropriate words: [4x1=4] i. Ammonium chloride solution is ---------- because of ----------hydrolysis. ii. According to the Law of Mass Action , the rate of chemical reaction is ----------proportional to the product of the -----------------of reactants. iii. In conversion of Cl 2 to ClO3 -- the oxidation state of Chlorine changes from ------ to ------. iv. The chlorides of Beryllium and Aluminium are soluble in ----------- solvents and behave as strong Lewis -------------. (b) Select the correct alternative from the choices given: [4x1=4] i. The correct set of four quantum numbers for the valence electron of Rubidium (Z=37) is: 1. 5,0,1, +1/2 2. 5,1,0, +1/2 3. 5,0,0 +1/2 4. 5,1,1, +1/2 ii. Which of the following molecules contain no pi bonds?
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