SSLC Christmas Exam Chemistry Mega Prediction PDF

# **START WHERE YOU ARE. USE WHAT YOU HAVE. DO WHAT YOU CAN.** - Arthur Ashe # When molten sodium chloride is electrolysed the gas liberated at the anode is **Chlorine** # ഉരുകിയ സോഡിയം ക്ലോറൈഡിനെ വൈദ്യുതവിശ്ലേഷണം നടത്തുമ്പോൾ ആനോഡിൽ സ്വതന്ത്രമാകുന്നത് - **ക്ലോറിൻ** വാതകമാണ് - A diagram depicting electrolysis of molten sodium chloride is given. The container is labeled as a cloud with "NaCl Solution," and there are electrodes labeled A and C. Electrode A is labeled Cl2 and electrode C is labeled Na. # **NaCl Solution** /Nacl £122/3)/ - A diagram depicting electrolysis of aqueous sodium chloride solution is given. The container is labeled as a cloud with "NaCl Solution," and there are electrodes labeled A and C. Electrode A is labeled Cl2 and electrode C is labeled H2. # **Electroplating** - A diagram depicting electroplating of copper on iron bangle is given. ### **What is electroplating?** **Electroplating** is the process of coating a metal object with a thin layer of another metal. ### Which is the electrolyte used in electroplating of copper on iron bangle? The electrolyte used in electroplating of copper on iron bangle is **Copper Sulfate** (CuSO4). ### Which metal is connected to the positive terminal of the battery? The metal connected to the positive terminal of the battery is **Copper**. - A diagram depicting electroplating of copper on iron bangle is given. The bangle is labeled as "Bangle" and the positive electrode labeled with the symbol "+" and "Copper" underneath is labeled with a flag and "KONDANO." ## Haematite is converted into iron by reactions taking place in blast furnace. ## **Fe2O3** ### a) write the molecular formula of haematite. The molecular formula of haematite is **Fe2O3**. ### b) which substance act as the reducing agent in this process? Write chemical equation that shows the formation of slag The reducing agent in this process is **Carbon Monoxide (CO)**. ### **The chemical equation that shows the formation of slag is :** **CaO + SiO2 → CaSiO3 (Slag)** ## The figure depicts the electrolysis of mixture of alumina and cryolite ## Label **Anode, Cathode & Electrolyte**. A diagram depicting electrolysis of a mixture of alumina and cryolite. The container is labeled as a rectangle with a middle compartment divided into columns with several "+" symbols to the right of the compartment. The following is labeled: - **Cathode (A)** - **Anode (C)** - **Electrolyte (D)** - The mixture of alumina and cryolite is labeled as "Alumina + Cryolite." ## Explain the method of obtaining pure aluminum from alumina by electrolysis. In this process carbon anodes are replaced from time to time. Why? ### **The method of obtaining pure aluminum from alumina by electrolysis is as follows:** - Alumina is dissolved in molten cryolite, which lowers the melting point of alumina. - The mixture is then electrolysed using a carbon anode and a carbon cathode. - At the cathode, aluminum ions (Al3+) gain electrons and are reduced to form molten aluminum. - At the anode, oxygen ions (O2-) lose electrons and are oxidized to form oxygen gas. - Aluminum is then tapped from the bottom of the electrolytic cell, while the oxygen gas reacts with the carbon anode to form carbon dioxide (CO2). ### **Why are carbon anodes replaced from time to time?** Carbon anodes are replaced from time to time because they are consumed in the reaction. - A diagram showing this process is given. The carbon anode is labeled as "carbon" and the arrow from carbon to the right of the circle labeled "oxidation" is labeled with "253 degrees" and the arrow to the left of the circle labeled "decay" is labeled with "mm." ## **Preparation of Ammonia** - A diagram depicting the preparation of ammonia is given. The container in the center is labeled as "Mixure X" and the "Drying agent" is labeled with a cloud and labeled "CaO." ### 1)write down the equation related with the preparation of ammonia **2 NH4Cl + Ca(OH)2 →CaCl2 + 2 NH3 + 2 H2O** ### 2) What is the role of **CaO** in the preparation of ammonia? **CaO is used as a drying agent to absorb the water produced in the reaction.** ### 3) Why the glass jar collecting ammonia is kept in inverted position? **The glass jar collecting ammonia is kept in an inverted position because ammonia is less dense than air and will float to the top.** ## **Liquor vs. Liquified Ammonia** - A diagram depicting the difference between liquor and liquified ammonia is given. The diagram is a circle labeled with "gas -> liquid" and "धाव-लिया." ### What are the differences between a liquor and Liquified Ammonia **Liquor is a highly concentrated solution of ammonia in water. Liquified ammonia is ammonia gas that has been compressed and cooled to a liquid state.** ## **Equilibrium Graph** - A diagram depicting an equilibrium graph is given. The graph is labeled with "rate of a chemical reaction," "time" and "D" and "E" on the graph. ### Identify A,B & C from the equilibrium graph - **A** represents the initial rate of the forward reaction. - **B** represents the initial rate of the reverse reaction. - **C** represents the equilibrium state where the rate of the forward reaction is equal to the rate of the reverse reaction. ## **N2 + 3H2 ⇌ 2NH3 + Heat** ### How does the following changes affect the rate of forward reaction? ### a) More nitrogen is added **Adding more nitrogen will increase the rate of the forward reaction.** ### b) Temperature is decreased **Decreasing the temperature will decrease the rate of the forward reaction.** ### c) Pressure is increased **Increasing the pressure will increase the rate of the forward reaction.** ### d) Ammonia produced is removed from the system **Removing ammonia will increase the rate of the forward reaction.** ## **Cotton dipped in HCl** **Cotton dipped in ammonia solution** **Thick white fumes of NH4Cl ** ### 1)identify the white powder, formed The white powder formed is **Ammonium chloride (NH4Cl)**. ### 2) write down the chemical equation of the formation of this white powder **NH3 + HCl → NH4Cl** ### 3) On heating the white powder, disappear, why? On heating, ammonium chloride decomposes into ammonia and hydrogen chloride gas. **NH4Cl → NH3 + HCl** ## **H2(g) + I2(g) ⇌ 2HI(g)** ### What is the total number of moles of reactants and products in the above reaction? **The total number of moles of reactants and products in the above reaction is 4.** ### What is the effect of pressure in this reversible reaction? Explain **Increasing the pressure will shift the equilibrium to the right, favoring the formation of HI.** This is because the forward reaction produces fewer moles of gas than the reverse reaction, and the system will try to relieve the pressure by shifting to the side with fewer moles of gas. ## **Industrial Preparation of Sulfuric Acid** - A flow chart depicting the industrial preparation of Sulfuric Acid is given, which includes the following labeled components: - **Sulphur** - **02** - **SO2** - **450 degrees C, V2O5** - **SO3** - **Conc. H2SO4** - **H2O** - **H2SO4** - **H2S2O7** ### The flow chart of the industrial preparation of sulphuric acid is given. Complete it. - Sulphur is burned in air to form sulfur dioxide(SO2). - SO2 is then oxidized to sulfur trioxide (SO3) in the presence of a catalyst (V2O5). - SO3 is then dissolved in concentrated sulfuric acid to form oleum (H2S2O7). - Oleum is then diluted with water to form concentrated sulfuric acid (H2SO4). ### **Properties of Sulfuric Acid** - Diagram includes 3 numbered bullet points. - The industrial preparation of Sulphuric Acid is given, that includes the following labeled components: - **Dehydrating property** - **Drying nature** - **Oxidising** - **C + H2SO4 → CO2 + SO2 + 2 H2O** ## **Molecular formula related with alkene** ### CnH2n - Diagram illustrates a circle containing "ane -> CnH2n+2, ene ->CnH2n, yne -> CnH2n-2." ## **IUPAC Nomenclature** - A diagram depicting the IUPAC nomenclature of organic compounds is given. The compound is labeled with following numbers and structural formulas: -CH3CH2CH(CH3)CH(CH3)CH3 ### Write down the IUPAC name of the given compounds The IUPAC name of the given compound is 2,3-dimethylpentane. - A diagram depicting the IUPAC nomenclature of organic compounds is given. The compound is labeled with following structural formulas: -CH3CH=CHCH2CH3 ### Write down the name of following organic compounds The IUPAC name of the given compound is: Pent-2-ene ### Write the following organic compounds: -Diagram includes 3 numbered bullet points with a check mark next to each. ### 1)But-2-ene - The structural formula for But-2-ene is - CH3CH=CHCH3 ### 2)Hex-3-yne - The structural formula for Hex-3-yne is - CH3CH2C≡CCH2CH3 ### 3)Oct-4-ene - The structural formula for Oct-4-ene is - CH3CH2CH2CH=CHCH2CH2CH3 ## **Functional Group Nomenclature** - Diagram includes 4 numbered bullet points. ### Name of the Functional group - 1) **COOH** → **Carboxylic acid, Acid** - 2) **OH** → **Hydroxy, Alcohol** - 3) **R-O** → **Aldehyde** - 4) **F, Cl, Br, I** → **Halogen** ## What is the name of a compound with one propyl groups on the second carbon of a hexane chain? - A structural formula of a compound is given: - CH3CH(CH2CH2CH3)CH2CH2CH3 ### The name of the compound with one propyl groups on the second carbon of a hexane chain is **2-propylheaxane.** ## **CH3CH(CH2CH3)CH2CH2CH3** ### Write IUPAC name The IUPAC name of the compound is: 3-methylhexane. ## *Write down the structural formulae of compounds given below.* ### a. 2,2-Dimethy hexane The structural formula for 2,2-dimethylhexane is: CH3C(CH3)2CH2CH2CH2CH3 ### b. But-2-ene The structural formula for but-2-ene is: CH3CH=CHCH3 ## *Mark the main chains of the compounds given below.* - 2 diagrams depicting structural formulas are given. - The structural formulas are as follows: - **CH3CH2CH(CH3)CH3** - **CH3CH2C(CH3)2CH3** The main chain of the first compound is: - CH3CH2CH(CH3)CH3 The main chain of the second compound is: - CH3CH2C(CH3)2CH3

SSLC Christmas Exam Chemistry Mega Prediction PDF

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