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VIBGYOR HIGH Third Preliminary Examination AY 2020-21 CHEMISTRY Grade: X Max. Marks: 80 Date: 24/03/2021 Time allowed: 2 Hours _________________________________________________________ INSTRUCTIONS: 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 in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. Attempt all questions from Section I and any four questions from Section II. The intended marks for the questions or parts of questions are given alongside in brackets [ ] ___________________________________________________________________ SECTION-I (40 Marks) Attempt all questions from this Section Question 1 a Choose the correct answer from the options given below: (i) An element in period-3 whose electron affinity is zero: A He B Ne C D Ar Xe (ii) Which amongst the following is a characteristic of an electrovalent compound? A It is easily vaporised. B It has high boiling point. C It is a weak electrolyte. D It often exists as a liquid. 1 [5] [1] [1]
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