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ICSE Prelims 2016 : Chemistry (GEMS Modern Academy, Dubai)

5 pages, 81 questions, 81 questions with responses, 146 total responses,

Nikhil Subhash
GEMS Modern Academy, Dubai

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CHEMISTRY PRACTICE PAPER -2015-16 Grade: 10 Time: 2hrs Date: 28.12.2015 Max.marks: 80 _______________________________________________________ INSTRUCTIONS: The time stated above is the time allowed for writing the examination. In addition the first 15 minutes will be the time given for reading the question paper. This paper is divided into Section A( 40 marks) and Section B ( 40 marks). Answer all questions from Section A and any four questions from Section B ________________________________________________ SECTION A ( 40 MARKS ) Answer ALL Questions Question 1: (a). Fill in the blanks with appropriate word/s in each case : [5] (i) Increase in nuclear charge of an atom ________ [decreases/increases] the tendency of the atom to lose electrons. (ii) Alkenes generally undergo ____________ type of reaction.[addition/ substitution ] (iii) An atom is said to be a non-metal if it _________ [gains/loses] one or more electrons. (iv)Covalent compounds are formed by sharing electron pairs between nonmetallic atoms. Non-metallic atoms having ___, ___, ____ Valence electrons [3, 5, 6, 7] share one, two or three pairs of electrons respectively. (v) The covalent molecule containing three single covalent bonds is ________ [water /methane / ammonia] This paper consists of 5 printed sides 1 (b) Give reason/s for the following : [5] (i) NH3 gas a covalent compound does not conduct electricity but its aq.soln. NH4OH is a weak electrolyte. (ii) Dilute sulphuric acid is a stronger acid compared to dilute acetic acid. (iii) Zinc chloride is stored in air tight bottles. (iv) Sulphuric acid forms two types of salts on reaction with an alkali. (v) Ammonia is used as a refrigerant . (c) Complete the following :[5] (i) The gas liberated when ammonium nitrite is heated-------------------[nitrogen / ammonia] (ii) The hydroxide which is soluble in excess of NaOH is ______ [Zn(OH)2 / Fe(OH)3 /Fe(OH)2] (iii) The salt which will not react with NH4OH solution _______ [ZnCl2/CuCl2/NH4Cl/FeCl2] (iv) The electrode at which anions donate excess electrons and are oxidized to neutral atoms is the _____ [anode/cathode] (v) Salts ionize in aq.soln. on passage of ----------------[direct / alternating ]electric current to give ions . d) Choose from the list of substances one substance in each case, which matches the description (i) to (v) below [Mercury, Bromine, Zinc, Carbon, Acetylene [5] i) This non-metal is a liquid at room temperature. ii) This metal has a hydroxide which is soluble in sodium hydroxide solution. iii) This non-metal has an allotropic form which conducts electricity. iv) An organic gas which forms red precipitate with ammoniacal cuprous chloride v) This metal is a liquid at room temperature. e) Define the following :(i) Gay Lussac s law (ii) Mole (iii) Empirical formula (iv) Avagadro s law (v) Electrolysis.- [5] f) State the colour of :[5] (i) The phenolphthalein solution after passage of ammonia through it. (ii) Copper [II] hydroxide solution after addition of ammonium hydroxide in excess of it. (iii) Pure nitric acid. (iv) Few drops of Concentrated sulphuric acid on sugar crystals . (v) Crystal of hydrated copper [II] sulphate. 2 g) Complete the following equation : (i) Zn + dil. H2SO4 (ii) Na2SO3 + dil. H2SO4 (iii) NaCl + conc. H2SO4 ( less than 200 0 C) (iv) MnO2 + conc. HCl (v) (NH4)2SO4 + NaOH [5] h) Element A, B, C and D have atomic number 20,8,6,17 respectively. Without identifying the element, answer the following questions: [2+2+1] i) What type of bonding is formed between (a) A and B and (b) C and D. ii) Write the formula of the compound formed between 1) A and B 2) C and D. iii) Which compound conducts electricity (A and B ) or (C and D) and give reason to support your answer. SECTION II (40 marks) Attempt ANY FOUR from this section Question 2 a) i) How many elements are present in 3rd period? [5] ii) Arrange the elements of 2nd period in the increasing order of their atomic size. iii) Inert gases have zero valencey. Why? iv) How does ionisation potential differ down the group and across the period? v) The volume occupied by 2g of Hydrogen at STP is equal to ______________ e) Give reasons, i) Alkenes are more reactive than alkanes. ii) Metals are electropositive in nature. iii) Carbon tetrachloride is a non-electrolyte. iv) Bond formed in Hydrogen molecule is non-polar covalent bond. v) Aluminium is used in thermite welding . 3 [5] Question 3 [10] a) At room temperature & pressure, 1 mole of SO2 occupies 24 dm3. 3 i) What is the mass of 6 dm of SO2? ii) What is the volume occupied by 80g of SO2? iii) How many moles of SO2 are present in 96g of it? iv) If one mole of SO2 contains N molecules, how many molecules are there in (Given that S=32, O=16) 0.64g of SO2? v) Calculate the weight of 0.5gram molecules of SO2? Question 4 a) i)Name the compounds required for the preparation of Nitric acid. Give the balanced chemical equation for the reaction. [2] ii) What happens when conc nitric acid reacts with Cu and C ? [3] b) Calculate the volume of O2 required for the complete combustion of 20cm3 of propane. A complete equation for the reaction is [C3H8 + 5O2 3CO2 + 4H2O] [2] ii) A compound has the following percentage composition by mass. Carbon 25.41%, Hydrogen 3.17%, Oxygen 33.86% and chlorine 37.56%. Use this data to determine the empirical formula of the compound. ( Give the result up to 2 decimal places) given that ( H=1, C=12, O=16, Cl=35.5) [3] Question 5 [1.5] a) Three solutions A, B, C have pH 1,6,13 respectively. i) Which solution is strongly acidic? ii) Which solution is strongly alkaline? iii) The solution that contains both ions as well as molecules. b) Name the acid salt and normal salt of phosphoric acid. [1.5] c) Write the IUPAC name: [3] i) H3C CH= CH CH3 ii) H3C CHO iii) CH3-CH2-CO-CH3 d) Write the balanced equation for the preparation of the following: [2] i) Ethyne from calcium carbide. ii) Ethanoic acid from ethane. e) Ethylene forms an addition product with chlorine. Name this addition product and write its structural formula. [2] 4 Question 6 a) Name the most common ore of Aluminium. [1] b) Name the process by which ore is purified. [1] c) Name the gas liberated at anode during its electrolytic reduction. [1] d) Give equations taking place at cathode & at anode. [2] [1] e) Name two metallic oxides reduced by carbon. f) Name one metallic oxide reduced by carbon monoxide. [1] g) Give the balanced chemical equations for the reactions taking place in (b) [3] Question 7 a) State one observation each for the following i) Red lead is heated with concentrated HCl. ii) Silver nitrate solution is added to dilute HCl. iii) Concentrated sulphuric acid is added to formic acid . iv) Ethylene is passed through dilute bromine water. v) Copper sulphate solution is electrolysed using copper electrodes. [5] b) Sodium hydroxide solution is added to solutions containing the ions in List 1. List 2 gives the details of the precipitates obtained. Copy and complete the table below to match ions with precipitates . [5] List 1 List 2 1)Cu2+ 2) Fe2+ 3) Pb2+ 4) Fe3+ 5) Ca2+ A)White precipitate , soluble in excess B)Reddish brown precipitate C)White precipitate, insoluble in excess D)Blue precipitate E)Dirty green precipitate 5

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