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ICSE Class X Mid-term 2025 : Chemistry

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Anubhav Sarkar
Garden High School, Kolkata

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GARDEN HIGH SCHOOL CLASS X Half-Yearly Examination 2017 Chemistry Time: 2 hours Full Marks: 80 This Question Paper has six printed pages. Answers must be written in the script/s provided. You will not be allowed to write for the first 15 minutes. This time must be spent in reading the Question Paper. The time given at the head of this Paper is the time allowed for writing answers. This Paper is divided into two sections. Answer all the parts of Q No 1 (Section I) and any four questions of Section II. Maximum marks for a question or part of a question are given in brackets [ ]. SECTION I (40 marks) Answer all the parts. Question No 1 (a) Fill in the blanks: (i) [5] In the Ostwald s process, a mixture of pure dry ammonia and air in the ratio of ______ by volume is compressed and then passed over ______ at about ______ C, resulting in the ______ oxidation of ammonia. (ii) In the Haber s process, the ammonia gas produced is separated from the unreacted nitrogen and hydrogen by the method of ______. (iii) HCl gas produced in the laboratory cannot be dried using phosphorus pentoxide as it produces ______ and ______ . (iv) Ammonia gas produced in the laboratory is collected by the ______ displacement of ______. (v) Nitric acid cannot be concentrated beyond 68% by distillation when it forms a/an ______ mixture. (b) Choose the appropriate answer from the given options: (i) The salt that produces a red solution with methyl orange is: (A) NaHCO3 (C) Na2SO4 (B) K2CO3 (D) ZnSO4 [5]

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