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ICSE Class X Prelims 2023 : Chemistry (The Bishop's School, Camp, Pune)

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Indian Certificate of Secondary Education (ICSE), New Delhi

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THE BISHOP S EDUCATION SOCIETY PRELIMINARY EXAMINATION 2022-2023 SUBJECT: CHEMISTRY CLASS: X TIME: 2 HOURS DATE: 11.01.2023 MARKS: 80 ____________________________________________________________________________ Answer 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 in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. 2nd Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets []. All chemical equations must be balanced. Section A (40 marks) Attempt all questions from this section. Question 1. Choose one correct answer to the questions from the given options: [15] (i) Arrange the elements in the decreasing order of atomic size. (a) Be, B, C, Li, F, N, O (b) C, F, Be, B, O, Li, N (c) Li, Be, B, C, N, O, F (d) F, O, N, C, B, Be, Li (ii) The molecular formula of a gas with vapour density 15 and empirical formula is CH3: (a) CH3 (b) C2H4 (c) C3H6 (d) C2H6 (iii) When electronegativity difference in between the combining atoms is negligible, bond formed is: (a) Ionic bond (b) Polar Covalent bond (c) Co-ordinate bond (d) Non-polar Covalent bond (iv) Consider the following ionic reaction: Cu Cu + 2e . Identify at which electrode would above mentioned reaction takes place and whether it is an example of oxidation or reduction. (a) Cathode, oxidation (b) Cathode, reduction (c) Anode, oxidation (d) Anode, reduction (v) Two neighbours of a homologous series differ by: (a) CH (b) CH2 (c) CH3 (d) CH4 (vi) An application of electrolysis in which anode does not diminish in size: (a) Electroplating (b) Electrorefining (c) Electrometallurgy (d) Metallic conduction (vii) ______ is used as cathode during the electrorefining of impure copper. (a) Impure copper (b) Pure copper (c) Copper Sulphate (d) Graphite (viii) The brown ring test is used for the detection of: (a) CO32(b) SO32(c) Cl- (d) NO3- (ix) The pH of a solution [of a compound] which reacts with NH4Cl to liberate a gas which turns phenolphthalein - colourless to pink is (a) less than 7 (b) 7 (c) less than 3 (d) more than 7 (x) The organic compound which undergoes substitution reaction is: (a) C2H2 (b) C2H4 (c) C10H18 (xi) The catalyst used during Haber s process is (a) Vanadium pentoxide (b) Copper (d) C2H6 (c) Platinum (xii) Electrolytic dissociation can be seen in which kind of compounds? (a) Ionic compounds (b) Polar Covalent compounds (c) Non-polar Covalent compounds (d) Molecular compounds 1 (d) Iron

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