Formatting page ...
SECOND PRELIM EXAMINATION 2015-2016 CLASS: X DATE: 14/01/16 Subject: Chemistry Marks: 80 Dur : 2Hrs Section A (40 Marks) Attempt all the questions from this Section Q1 A Name the following 8 1. The electrolyte used to electroplate an article with silver. 2. The salt which on reaction with water produces ethyne gas. 3. A solid dehydrating agent. 4. A solution which on heating with calcium carbonate produces carbon dioxide gas. 5. The type of reaction which takes place when ethanol is converted to ethene. 6. An aqueous salt used for testing sulphate radical. 7. A coloured deliquescent salt. 8. The gas produced on heating sodium nitrate. 1. 2. 3. 4. 5. 6. ` B Choose the correct alternative 6 The formation of ethene from ethyl chloride is an example of a) Substitution b) Dehydration c) Dehydrohalogenation d) Addition 0.80g of CH4 contains a) 2 Moles b) 0.5 moles c) 0.05 moles d) 0.005 moles Chemically rust is a) Fe3O4 b) Fe2O3 c) Fe3O4.xH2O d) Fe2O3.xH2O The organic compound mixed with ethanol to make it spurious a) Methanoic acid b) Methanal c) Methanol d) Ethanoic acid A nitrate which produces laughing gas on decomposition a) Ammonium nitrate b) Calcium nitrate c) Sodium nitrate d) Ferric nitrate The metal whose hydroxide does not decomposes on heating but its nitrate decomposes on heating a) Sodium b) Calcium c) Iron d) Aluminium C Give observations for the following 1. Ethyne is added to ammonical cuprous chloride solution. 2. Sodium hydroxide is added to lead nitrate in drops followed by excess. 3. Ammonia gas is oxidised. 4. A piece of sodium is dropped in a test tube containing ethyl alcohol. 5. Carbon monoxide is passed over heated copper oxide. 6. Dilute sulphuric acid is added to ferrous sulphide. 6 D Give reasons for the following 5 1. Metal acts as a good reducing agent. 2. Copper is a good conductor of electricity but it is not an electrolyte. 3. Alkanes undergo substitution reaction, while alkenes undergo addition reaction. 4. The gas obtained when zinc reacts with dilute H2SO4 or concentrated H2SO4 are different. 5. To distinguish between dilute Nitric and dilute sulphuric acid, barium chloride solution can be used. Page 1 of 4
|
