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SARALA BIRLA ACADEMY- BANGALORE PRE-BOARD EXAMINATIONS 2017 2018 CHEMISTRY (Two Hours) Grade X Monday, 15/01/2018 _____________________________________________________________________________________ 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. This Paper is divided into two parts, Section I and Section II. 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) Compulsory (Answer all questions from this section) Question 1 (a) Select from the list given below (a to f), the one substance in each case which matches the description given in the parts(ii) to (vi). Copy and complete the given grid with your answer as shown for part (i). [5] (i) (ii) (iii) (iv) (v) (vi) A A. Ammonia B. Copper oxide C. Copper sulphate D. Hydrogen chloride E. Hydrogen sulphide F. Lead bromide (i) Although this compound is not a metal hydroxide, its aqueous solution is alkaline in nature. (ii) A solution of this compound is used as the electrolyte when copper is purified. (iii) When this compound is electrolysed in the molten state, lead is obtained at the cathode. (iv) This compound can be oxidized to chlorine. (v) This compound smells of rotten eggs. (vi) This compound can be reduced to copper when heated with coke. (b) Iron is extracted from its most common ore (i) ___________ . Its formula is (ii) _______. The two valencies exhibited by iron are (iii) ________ and (iv) __________. Iron , when reacts with [5] (v) _______ forms anhydrous Iron (III) chloride. ______________________________________________________________________________________ This paper consists of 6 printed pages SBA/PB/X/CHEM/2018 Turn over 1
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