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ST. STEPHENS SCHOOL DUMDUM PRE-BOARD EXAMINATION 2021 CHEMISTRY CLASS 10 ( Full Marks : 80 Time : 15 Mins Reading 2 Hours Writing 30 Mins Scanning & Making PDF ) 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. 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) Attempt all questions from this Section Question 1 (a)Choose the most appropriate answer: [10] i) Among the period 2 elements, the element which has high electron affinity is a) Lithium b) Carbon c) Neon d) Fluorine ii) Compound X consists of only molecules. X will have a) Crystalline hard structure b) A low m.p & low b.p c) An ionic bond d) A strong force of attraction between its molecules iii) The formation of ethane from ethyne is an example of a) Addition reaction b) Substitution reaction c) Dehydration reaction d) Dehydrohalogenation reaction iv) Which of this will act as a non-electrolyte Protect by PDF Anti-Copy for Android (Update to Pro to remove watermark)
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