Formatting page ...
ON THE WINGS OF EXCELLENCE CYCLE TEST-1 FOR CLASS X (2018-19) SCIENCE PAPER-2 (CHEMISTRY) TIME: 1 HOUR 15 MINUTES F.M: 50 Answer to this paper must be written on the paper provided separately. You will not be allowed to write during the first 10 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. The intended marks for the questions or parts of the questions are given in brackets [ ]. Question 1 (a)Give balanced chemical equations for the conversions A to K (b) Identify A, B, C, J, K. How are the conversions D, E, F, G, H, I carried out? Question-2 (a) Why is pure acetic acid is called as glacial acetic acid? [5] [5] [1] (b) What are Spurious and Denatured Alcohol ? Why is it not used for human consumption [2] (c) Alkenes are more reactive than alkanes [1] (d) Alkenes are known as Olefins [1] (e) A mixture of oxygen and ethyne is used for welding but not a mixture of ethyne and air? [1] CHE/CT-2/2018-19/KSH This question paper consists of 3 printed pages and 1 blank pagePage 1 (f) Methane does not undergo addition reaction, but ethyne does. [1] (g) Describe the changes observed on the addition of Br2 dissolved in carbon tetrachloride to gas jars containing [1] (i) ethane (ii) ethene (iii) ethyne Question-3 (a) Write the I.U.P.A.C. names of the following compounds: (i) (iii) (ii) (iv) vi) ix) [5] (v) vii) viii) x) (b)Give the structural formula for each of the following: i) 2,2-Dimethylbutanal. ii)3-Chloropropanoic acid iii) 2-Methylbut-2-ene. iv) Propylene [2] OR (c) Draw different isomers having the following molecular formula: (i) C5H12 (chain) (ii) C4H8 (position). CHE/CT-2/2018-19/KSH This question paper consists of 3 printed pages and 1 blank pagePage 2 Question-4 Write the balanced chemical equations for the following reactions/laboratory preparation. (a) Preparation of methane from anhydrous sodium ethanoate (sodium acetate) (b) Ethane from sodium propionate (lab.prep) (c) Ethene from iodo ethane(lab.prep) (d) Ethyne from calcium carbide(lab.prep) (e) Methane from iodomethane (f) Ethyl alcohol from bromoethane (g) Ethane from ethyl bromide (h) Ethyne from ethylene di bromide (i) ethene to ethyl alcohol (j) Ethane to carbondioxide Question-5 Convert the following (a) Acetic acid to Sodium acetate in presence of sodium bicarbonate (b) Acetic acid to ethyl acetate in presence of conc. sulphuric acid. (c) Heating ethanol (excess) at 1400 C in the presence of conc. Sulfuric acid (d) Ethanol to sodium ethoxide as a test for alcohol (e) Combustion of ethanol in presence of oxygen [10] [5] Question-6 (a) Alkanes react with halogens to give a substitution product. Give the reaction and name the product formed when chlorination of methane occurs. [3] (b) Name the products formed in the chlorination of ethane and give balanced equations. [3] Question-7 Concentrated sulphuric acid is a [4] (i) Oxidizing agent (reaction with carbon , sulphur) (iii) Dehydrating agent(dehydration of copper sulphate, sugar) Write Equations as instructed in brackets each to illustrate the above-mentioned properties of sulphuric acid. CHE/CT-2/2018-19/KSH This question paper consists of 3 printed pages and 1 blank pagePage 3
|
