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PARLE TILAK VDYALAYAICSE) PRELIMINARY EXAMINATION Grade:X Date: 09.01.2024 SCIENCE-PAPER 2 Marks: 80 Time : 2 hrs CHEMISTRY 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 answers. This Paper is divided into two sections Attempt all questions from Section A and any four questions from Section B. The intended marks for questions or parts of guestions are given in brackets |1 This paper consists of Six printed pages. Section A(40 marks) (Attempt all questions) Question Choose the correct answers to the questions from the given options. (Do not copy the questiorns, write the correct answers only.) i. The elements arrangcd in increasing order of ionisation potential in a period of the [15] periodic table arc. a. Carbon, Boron, Nitrogen b. Oxygen, Carbon, Neon c. Boron, Beryllium, Lithium d. Boron, Carbon, Nitrogen, i. The covalent compound has a shared pair of electrons unequally distributed between its two atoms. a. Nitrogen b. Chlorine c. Ammonia d. Methane ii. During electrolysis of acidified water using sulphuric acid the ions formed are Hydrogen ion, sulphate ion, and hydroxide ion of which the ion/s discharged at the anode is. a. Sulphate ion b. Hydroxide ion C. Hydrogen ion d. All of the above iv. The vapour density of carbon dioxide is. [C= 12 0=16] a. 32 b. 44 C. 22 d. 88 v. Glucose reacts with concentrated sulphuric acid to give avery pure form of carbon called sugar charcoal. The reaction is caled Oxidation b. Combination C. Combustion d. Dehydration This paper consists of six printed pages.
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