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CBSE Class 12 Pre Board 2020 : Chemistry (Kendriya Vidyalaya (KV) Agra)

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KENDRIYA VIDYALAYA SANGATHAN,AGRA REGION (SET-H) PRE BOARD EXAMINATION 2019-20 CHEMISTRY (Theory) Class: XII Time: 3 Hrs. Max. Marks: 70 GENERAL INSTRUCTIONS:(a) All questions are compulsory. (b) Section A: Q.Nos. 1 to 20 are very short answer questions (objective type) and carry 1 mark each. (c) Section B: Q.Nos. 21 to 27 are short answer questions and carry 2 marks each. (d) Section C: Q.Nos.28 to 34 are long answer questions and carry 3 marks each. (e) Section D: Q.Nos. 35 to 37 are also long answer questions and carry 5 marks each. (f) 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. (g) Use log tables if necessary, use of calculators is not allowed. SECTION A Passage Based Questions ( Q.Nos 1 to 5) Read the given passage and answer the questions 1 to 5 that follow: The equations derived for colligative properties are based on the assumption that solutions are dilute and solute molecules do not dissociate or associate in solution. Discrepancies in determination of molar masses or measuring colligative properties arise when the solute dissociates or associates on dissolving in the solution, the number of molecules undergo a change. Van t Hoff introduced a factor called Van t Hoff factor ( i) to express the extent of association or dissociation of solute. 1. Electrolyte A gives 4 ions and B is a non-electrolyte, if 0.1 molar solution of solute B produces an osmotic pressure p then what will be osmotic pressure produced by 0.02 molar solution of A? 1 2. 0.2 m aqueous solution of a weak acid (HX) is 20% dissociated. Find the boiling point of this solution (Kb for water =0.052 Km-1) 1 Page 1 of 8 1

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