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Class-X Marks:80 Subject: Chemistry Time:2Hrs. Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent on reading the Question Paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt any four questions from Section II. The intended marks for questions or parts of questions are given in brackets ( ). Section I (40 Marks) Answer all the questions Question 1 a) Select the correct answers from A, B, C or D for the following statements: i) ii) An element X belongs to Group 2 of period 3. Then X has A) 3 valence electrons and 2 shells B) 2 valence electrons and 3 shells C) 2 valence electrons and 2 shells D) 1 valence electron and 2 shells Which of the following compound is not suitable for the preparation Ammonia by heating with an alkali? A) Ammonium sulphate B) Ammonium chloride C) Ammonium nitrate D) Ammonium sulphate and Ammonium chloride iii) Which of the following statement is not correct regarding electrolysis process: A) Cations get discharged at cathode B) Anions get oxidized at anode C) Metal deposits at anode D) Inert electrodes do not participate in electrolytic reaction. iv) The catalyst used in the preparation of Ammonia in Haber s process: A) Iron B) Platinum C) Silver D) Nickel v) Acidity of a base is defined as A) The number of Hydronium ions produced by one molecule of the base B) The number of Hydrogen ions produced by one molecule of an acid C) The number of Hydroxyl ions produced per molecule of the base in its solution D) The number of hydroxyl ions that a base contains b) Fill in the blanks:i) Sulphur reacts with Conc. ____________(HCl/HNO3) to give Sulphuric acid. ii) Strong acids dissociate ______________( completely/partially)tom give a high concentration of Hydronium ions in their aqueous solutions. iii) _______________ (Electrorefining / electroplating) makes an article attractive. iv) Aqueous solution of Ammonia is called ______________ (liquor/ liquid) ammonia. v) Nitric acid is a _______________(non-volatile/ volatile) acid. 5M
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