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CBSE Class 12 Pre Board 2020 : Chemistry - Prelim 1 (Delhi Public School (DPS), Jammu)

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DELHI PUBLIC SCHOOL, JAMMU ASSIGNMENT PRE-BOARD-I (2019-2020) SUBJECT-CHEMISTRY CLASS-XII General Instructions (a) All questions are compulsory. (b) (c) (d) (e) (f) Section A: Q.no. 1 to 20 are very short answer questions (objective type) and carry 1 mark each. Section B: Q.no. 21 to 27 are short answer questions and carry 2 marks each. Section C: Q.no. 28 to 34 are long answer questions and carry 3 marks each. Section D: Q.no. 35 to 37 are also long answer questions and carry 5 marks each. There is no overall choice. However an internal choice has been provided in two questions of two marks, two questions of three marks and all the three questions of five marks weightage. You have to attempt only one of the choices in such questions. Use log tables if necessary, use of calculators is not allowed. (g) SECTION A Questions 1 to 5 are passage questions: Read the given passage and answer the questions 1 to 5 that follow: For active metal, corrosion is common phenomenon. Metals like iron, copper, aluminium, silver shows corrosion. There are various methods used to prevent corrosion some of these are galvanization, electroplating, paint with colour, oxides of metal, cathodic protection, etc. (1) (2) (3) (4) (5) What is rust, chemically? Is corrosion an electrochemical process? Is galvanization an electroplating phenomenon? Which metal is used for galvanization? Copper gets a greenish layer on its surface. What is it chemically? Silver is usually rusted by which substance? Questions 6 to 10 are one word answers: (6) (7) Name the substance used as depressant in the separation of two sulphide ores in Froth floatation method. Name the best reagent used for the separation of 10,20 and 30 amines.

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