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VASUDEV C. WADHWA ARYA VIDYA MANDIR, BANDRA EAST Pre-Preliminary Examination, January 2021 STD: X CHEMISTRY- Science Paper 2 Marks: 80 SC.2 (CHEM) DATE: 25/01/2021 Time: 2 hrs. Answer to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 mins. This time will be spent in reading the question paper. The time given at the head of this paper is the time allotted for writing the answers. Attempt all the questions from Section I and any four from Section II. Intended marks for the questions or parts of the question are given in brackets [ ]. This paper consists of 7 printed pages. Please ensure the following:It is suggested to attempt the Terminal Review using only a Laptop or a Desktop (with a webcam). In case a mobile or tab is being used, please have an alternate device with a camera so that you are visible to the invigilator at all times. Camera must be kept on during the entire paper. Pre preliminary paper comprises two sections i.e. Section-A and Section-B. Each section will have to be uploaded separately in the space provided in the form with the necessary renaming of the file as mentioned in the form. If students encounter any problem accessing or submitting the review, he/she must inform the invigilator. SECTION I (40 Marks) (Attempt all questions from this section) Question 1 a). Choose the correct alternative from options A, B, C, D for each of the following: i. The bond formed between two atoms of Oxygen in the formation of Oxygen molecule is a________. A) Single covalent bond B) Triple Covalent bond ii. [10] C) Double covalent bond D) Ionic bond Vapour density of Carbon dioxide is _________. [At. Wt. :- C=12, O= 16] A) 44 C) 22 B) 28 D)14 iii. The _________ property of Sulphuric acid is depicted when white anhydrous mass is obtained on addition of concentrated Sulphuric acid to Blue vitriol. A) Non-volatile C) Acidic B) Dehydrating D) Oxidising iv. The drying agent used to dry Ammonia gas in its Laboratory preparation is _______________. A) Slaked Lime C) Phosphorous pentoxide B) Quick Lime D) concentrated Sulphuric acid 2
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