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MADHUSTHALI VIDYAPEETH F.M 80 Time 2 Hrs ANNUAL EXAMINATION 2018-2019 SUBJECT: CHEMISTRY CLASS- VIII 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. 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) Fill in the blanks: i. is formed when carbon is burnt in a limited supply of air or oxygen. ii. is formed when charcoal is burnt in a limited supply of air. iii. The sticky substance formed when soap is added to hard water iv. Freezing mixture contains and v. An ion which has a positive charge is called a [5] b) Choose the correct alternative: [5] i. In combined state, carbon occurs as (diamond/petroleum) ii. The process by which decayed plants slowly convert into coal is called (carbonistaion/fermentation). iii. Temporary hardness of water can be removed by (filtering/loading). iv. Colloids have the particle size range between (10-7 to 10-10m / 10-10 to 10-12m). v. The sub-atomic particle with positive charge is(proton/neutron). c) Write True/False and rewrite the corrected statement: i. Coke is obtained by destructive distillation of sugar. ii. Coal gas is used in the preparation of artificial fertilizers. iii. Diamond is insoluble in all solvents. iv. Central part of an atom is nucleus. v. Graphite has layers of hexagonal carbon bondings. [5] d) Write the molecular formula for the compounds: i. Baking Soda ii. Sulphuric Acid iii. Ethene iv. Lead (II) Oxide v. Magnesium Carbonate [5] e) What do you observe when: i. Blue vitriol is heated. ii. Blue litmus solution added to water. iii. A lit splinter is introduced into a jar containing carbon dioxide. [5] This paper consists of 3 printed pages.
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