{"id":6805,"date":"2019-12-29T09:43:40","date_gmt":"2019-12-29T04:13:40","guid":{"rendered":"https:\/\/versionweekly.com\/?p=6805"},"modified":"2019-12-29T09:43:40","modified_gmt":"2019-12-29T04:13:40","slug":"icse-chemistry-question-paper-2019-solved-for-class-10-pdf-download","status":"publish","type":"post","link":"https:\/\/versionweekly.com\/news\/icse\/icse-chemistry-question-paper-2019-solved-for-class-10-pdf-download\/","title":{"rendered":"ICSE Chemistry Question Paper 2019 Solved for Class 10 PDF Download"},"content":{"rendered":"<h2>ICSE Chemistry Previous Year Question Paper 2019 Solved for Class 10<\/h2>\n<ul>\n<li>Answers to this Paper must be written on the paper provided separately.<\/li>\n<li>You will not be allowed to write during the first IS minutes.<\/li>\n<li>This time is to be spent in reading the Question Paper.<\/li>\n<li>The. time given at the head of this paper is the time allowed for writing the answers.<\/li>\n<li>Section I is compulsory. Attempt any four questions from Section II.<\/li>\n<li>The intended marks for questions or parts of questions are given in brackets<strong> [ ]<\/strong>.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><strong>Section -1 [40 Marks]<\/strong><br \/>\n(Attempt all questions from this Section)<\/p>\n<p>Question 1.<br \/>\n(a) Choose the correct answer from the options given below:<strong> [5]<\/strong><br \/>\n(i) An electrolyte which completely dissociates into ions is :<br \/>\n(A) Alcohol<br \/>\n(B) Carbonic acid<br \/>\n(C) Sucrose<br \/>\n(D) Sodium hydroxide<br \/>\nAnswer:<br \/>\n(D) Sodium hydroxide<\/p>\n<p>(ii) The most electronegative element from the following elements is :<br \/>\n(A) Magnesium<br \/>\n(B) Chlorine<br \/>\n(C) Aluminium<br \/>\n(D) Sulphur<br \/>\nAnswer:<br \/>\n(B) Chlorine<\/p>\n<p>(iii) The reason for using Aluminium in the alloy duralumin is:<br \/>\n(A) Aluminium is brittle<br \/>\n(B) Aluminium gives strength<br \/>\n(C) Aluminium brings lightness<br \/>\n(D) Aluminium lowers melting point<br \/>\nAnswer:<br \/>\n(C) Aluminium brings lightness<\/p>\n<p>(iv) The drying agent used to dry HCl gas is :<br \/>\n(A) Cone. H<sub>2<\/sub>SO<sub>4<\/sub><br \/>\n(B) ZnO<br \/>\n(C) Al<sub>2<\/sub>O<sub>3<\/sub><br \/>\n(D) CaO<br \/>\nAnswer:<br \/>\n(A) Cone. H<sub>2<\/sub>SO<sub>4<\/sub><\/p>\n<p>(v) A hydrocarbon which is a greenhouse gas is :<br \/>\n(A) Acetylene<br \/>\n(B) Ethylene<br \/>\n(C) Ethane<br \/>\n(D) Methane<br \/>\nAnswer:<br \/>\n(D) Methane<\/p>\n<p>(b) Fill in the blanks with the choices given in brackets: <strong>[5]<\/strong><br \/>\n(i) Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of &#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\n(dehydration \/ dehydrogenation \/ dehydrohalogenation)<br \/>\nAnswer:<br \/>\ndehydration<\/p>\n<p>(ii) When sodium chloride is heated with concentrated sulphuric acid below 200\u00b0C, one of the products formed is &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;<br \/>\n(sodium hydrogen sulphate \/ sodium sulphate \/ chlorine)<br \/>\nAnswer:<br \/>\nsodium hydrogen sulphate<\/p>\n<p>(iii) Ammonia reacts with excess chlorine to form &#8230;&#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\n(nitrogen \/ nitrogen trichloride \/ ammonium chloride)<br \/>\nAnswer:<br \/>\nnitrogen trichioride<\/p>\n<p>(iv) Substitution reactions are characteristic reactions of &#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\n(alkynes \/ alkenes \/ alkanes)<br \/>\nAnswer:<br \/>\nalkanes<\/p>\n<p>(v) In Period 3, the most metallic element is &#8230;&#8230;&#8230;&#8230;&#8230;..<br \/>\n(sodium \/ magnesium \/ aluminium)<br \/>\nAnswer:<br \/>\nsodium<\/p>\n<p>(c) Write a balanced chemical equation for each of the following reactions: <strong>[5]<\/strong><br \/>\n(i) Reduction of copper (II) oxide by hydrogen.<br \/>\nAnswer:<br \/>\nCuO+H<sub>2\u00a0<\/sub>\u2192 Cu+H<sub>2<\/sub>O<\/p>\n<p>(ii) Action of dilute sulphuric acid on sodium hydroxide.<br \/>\nAnswer:<br \/>\n2NaOH + H<sub>2<\/sub>S0<sub>4<\/sub> \u2192 Na<sub>2<\/sub>SO<sub>4<\/sub> + 2H<sub>2<\/sub>O<\/p>\n<p>(iii) Action of dilute sulphuric acid on zinc sulphide.<br \/>\nAnswer:<br \/>\nZnS + H<sub>2<\/sub>SO<sub>4<\/sub> \u2192 ZnSO<sub>4<\/sub> + H<sub>2<\/sub>S<\/p>\n<p>(iv) Ammonium hydroxide is added to ferrous sulphate solution.<br \/>\nAnswer:<br \/>\nFeSO<sub>4<\/sub> + 2NH<sub>4<\/sub>0H \u2192 (NH<sub>4<\/sub>)SO<sub>4<\/sub> + Fe(OH)<sub>2<\/sub>\u2193<\/p>\n<p>(v) Chlorine gas is reacted with ethene.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48902526648_378ea53053_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 1\" width=\"272\" height=\"58\" \/><\/p>\n<p>(d) State one observation for each of the following: <strong>[5]<\/strong><br \/>\n(i) Concentrated nitric acid is reacted with sulphur.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903258702_e8f8801411_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 2\" width=\"365\" height=\"31\" \/><br \/>\nDense brown fumes of nitrogen dioxide gas will be released<\/p>\n<p>(ii) Ammonia gas is passed over heated copper (II) oxide.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903258757_66e874ef1a_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 3\" width=\"293\" height=\"52\" \/><br \/>\nThe black colour copper oxide will change to reddish pink copper.<\/p>\n<p>(iii) Copper sulphate solution is electrolysed using copper electrodes.<br \/>\nAnswer:<br \/>\nWhen copper sulphate solution is electrolysed using copper electrodes, reddish pink deposit of copper metal takes place on cathode.<\/p>\n<p>(iv) A small piece of zinc is added to dilute hydrochloric acid.<br \/>\nAnswer:<br \/>\nZn + 2HCl &gt; ZnCl<sub>2<\/sub> + H<sub>2<\/sub>\u2191<br \/>\nZinc metal dissolves forming solution with the liberation of hydrogen gas which bums with blue flame and gets extinguished with pop sound.<\/p>\n<p>(v) Lead nitrate is heated strongly in a test tube.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48902526818_2f0d1415c8_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 4\" width=\"337\" height=\"73\" \/><br \/>\nWhite powder of lead nitrate decompose to form yellow coloured lead oxide and liberating dense brown fumes of nitrogen dioxide gas.<\/p>\n<p>(e) (i) Calculate:<strong> [5]<\/strong><br \/>\n1. The number of moles in 12 g of oxygen gas. [O = 16]<br \/>\n2. The weight of 1022 atoms of carbon.<br \/>\n[C = 12, Avogadro\u2019s No. = 6 \u00d7 10<sup>23<\/sup>]<br \/>\nAnswer:<br \/>\n1. Oxygen gas (O<sub>2<\/sub>)<br \/>\nMolecular mass = 16 x 2 = 32 g<br \/>\n32 g of oxygen gas \u2192 1 mole<br \/>\n1 g of oxygen gas \u2192 [latex]\\frac { 1 }{ 32 }[\/latex] mole<br \/>\n12 g of oxygen gas \u2192 [latex]\\frac { 1 }{ 32 }[\/latex] \u00d7 12mole = 0.375 mole<\/p>\n<p>2. 6.022 x 10<sup>23<\/sup> atoms of carbon weigh \u2192 12 g<br \/>\n1 atom of carbon weighs \u2192 [latex]\\frac{12}{6 \\times 10^{23}}[\/latex]<br \/>\n10<sup>22<\/sup> atoms of carbon will weigh \u2192 [latex]\\frac{12}{6 \\times 10^{23}} \\times 10^{22}=\\frac{12}{60}=\\frac{1}{5}[\/latex] = 0.2 g<\/p>\n<p>(ii) Molecular formula of a compound is C<sub>6<\/sub>H<sub>18<\/sub>O<sub>3<\/sub>. Find its empirical formula.<br \/>\nAnswer:<br \/>\nMolecular formula = C<sub>6<\/sub>H<sub>18<\/sub>O<sub>3<\/sub><br \/>\nTake the common multiple<br \/>\nMolecular formula = (C<sub>2<\/sub>H<sub>6<\/sub>0)<sub>3<\/sub><br \/>\nMolecular formula = (Empirical formula)\u201e<br \/>\nThus, empirical formula = C<sub>2<\/sub>H<sub>6<\/sub>O<\/p>\n<p>(f) (i) Give the IUPAC name of the following organic compounds: <strong>[5]<\/strong><br \/>\n1.<br \/>\n2.<br \/>\nAnswer:<br \/>\n1. Prop &#8211; 1 &#8211; yne or propyne<br \/>\n2. Ethanal<\/p>\n<p>(ii) What is the special feature of the structure of ethyne ?<br \/>\nAnswer:<br \/>\nEthanal<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903258887_b269df11bb_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 5\" width=\"145\" height=\"33\" \/><br \/>\nSpecial feature of the structure of ethyne is the presence of triple bond.<\/p>\n<p>(iii) Name the saturated hydrocarbon containing two carbon atoms.<br \/>\nAnswer:<br \/>\nEthane<\/p>\n<p>(iv) Give the structural formula of Acetic acid.<br \/>\nAnswer:<br \/>\nAcetic acid (CH<sub>3<\/sub>COOH)<\/p>\n<p>(g) Give the appropriate term defined by the statements given below: <strong>[5]<\/strong><br \/>\n(i) The formula that represents the simplest ratio of the various elements present in one molecule of the compound.<br \/>\nAnswer:<br \/>\nEmpirical formula<\/p>\n<p>(ii) The substance that releases hydronium ion as the only positive ion when dissolved in water.<br \/>\nAnswer:<br \/>\nAcid<\/p>\n<p>(iii) The tendency of an atom to attract electrons totvards itself when combined in a covalent compound.<br \/>\nAnswer:<br \/>\nElectronegativity<\/p>\n<p>(iv) The process by which certain ores, specially carbonates, are converted to oxides in the absence of air.<br \/>\nAnswer:<br \/>\nCalcination<\/p>\n<p>(v) The covalent bond in-which the electrons are shared equally between the combining atoms.<br \/>\nAnswer:<br \/>\nNon-polar covalent bond<\/p>\n<p>(h) Arrange the following according to the instructions given in brackets : <strong>[5]<\/strong><br \/>\n(i) K, Pb, Ca, Zn. (In the increasing order of the reactivity)<br \/>\nAnswer:<br \/>\nPb &lt; Zn &lt; Ca &lt; K<br \/>\n(According to the position in reactivity series)<\/p>\n<p>(ii) Mg<sup>2+<\/sup>, Cu<sup>2+<\/sup>, Na<sup>1+<\/sup>, H<sup>1+<\/sup> (In the order of preferential discharge at the cathode)<br \/>\nAnswer:<br \/>\nNa<sup>1+<\/sup> &lt; Mg<sup>2+<\/sup> &lt; H<sup>1+<\/sup> &lt; Cu<sup>2+<\/sup><br \/>\n(According to electrochemical series of metals)<\/p>\n<p>(iii) Li, K, Na, H (In the decreasing order of their ionization potential)<br \/>\nAnswer:<br \/>\nH &gt; Li &gt; Na &gt; K<br \/>\n(Smaller the size greater is the ionization potential)<\/p>\n<p>(iv) F, B, N, O (In the increasing order of electron affinity)<br \/>\nAnswer:<br \/>\nB &lt; N &lt; O &lt; F<br \/>\n(Smaller the size more is the electron affinity)<\/p>\n<p>(v) Ethane, methane, ethene, ethyne. (In the increasing order of the molecular weight)<br \/>\n[H = 1, C = 12]<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48902526868_593607f77e_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 6\" width=\"274\" height=\"91\" \/><\/p>\n<p style=\"text-align: center;\"><strong>Section &#8211; II [40 Marks]<\/strong><br \/>\n(Attempt any four questions from this Section)<\/p>\n<p>Question 2.<br \/>\n(a) Draw the electron dot structure of : <strong>[3]<\/strong><br \/>\n(i) Nitrogen molecule [N = 7]<br \/>\nAnswer:<br \/>\nNitrogen molecule<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48902526953_53c453968b_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 7\" width=\"109\" height=\"114\" \/><br \/>\nNitrogen atom shares three electrons forming a triple covalent bond.<\/p>\n<p>(ii) Sodium chloride [Na = 11, Cl = 17]<br \/>\nAnswer:<br \/>\nSodium chloride<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903259012_ea2b7a9fda_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 8\" width=\"149\" height=\"99\" \/><br \/>\nSodium loses one electron to chlorine forming a positive ion and chlorine gains one electron forming a negative ion. These ions form an electrovalent bond and are held strongly by electrostatic forces of attraction.<\/p>\n<p>(iii) Ammonium ion [N = 7, H = 1]<br \/>\nAnswer:<br \/>\nAmmonium ion<br \/>\nN (7) \u2192<br \/>\nH (1) \u2192 H<sup>x<\/sup><br \/>\nFormation of ammonia<\/p>\n<p>Formation of proton<br \/>\nH &#8211; 1e<sup>&#8211;<\/sup> H<sup>+<\/sup><br \/>\nFormation of ammonium ion<br \/>\nAmmonia donates its lone pair to proton forming ammonium ion.<\/p>\n<p>(b) The pH values of three solutions A, B and C are given in the table. Answer the following questions: <strong>[3]<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052411_abeda34f18_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 9\" width=\"224\" height=\"101\" \/><br \/>\n(i) Which solution will have no effect on litmus solution?<br \/>\n(ii) Which solution will liberate CO<sub>2<\/sub>\u00a0when reacted with sodium carbonate?<br \/>\n(iii) Which solution will turn red litmus solution blue?<br \/>\nAnswer:<br \/>\n(i) C (Because pH 7 is neutral).<br \/>\n(ii) B (Because acids liberate CO<sub>2<\/sub> gas when treated with carbonates and acids have pH less than 7)<br \/>\n(iii) A (Bases turn red litmus blue and they have pH more than 7)<\/p>\n<p>(c) Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. <strong>[4]<\/strong><br \/>\n(i) Which element forms electrovalent compound with G?<br \/>\n(ii) The ion of which element will migrate towards the cathode during electrolysis?<br \/>\n(iii) Which non-metallic element has the valency of 2?<br \/>\n(iv) Which is an inert gas?<br \/>\nAnswer:<br \/>\n(i)<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903259082_120fbf9460_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 10\" width=\"117\" height=\"55\" \/><br \/>\n(ii) A [Positive ions migrate towards cathode, hence A will form A+ and migrate towards cathode]<br \/>\n(iii) E<br \/>\n(iv) F<\/p>\n<p>Question 3.<br \/>\n(a) Name the particles present in:<br \/>\n(i) Strong electrolyte<br \/>\n(ii) Non-electrolyte<br \/>\n(iii) Weak electrolyte<br \/>\nAnswer:<br \/>\n(i) Only ions<br \/>\n(ii) molecules<br \/>\n(iii) Ions as well as molecules<\/p>\n<p>(b) Distinguish between the following pairs of compounds using the reagent given in the bracket. <strong>[3]<\/strong><br \/>\n(i) Manganese dioxide and copper (II) oxide, (using concentrated HCl)<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052526_2275f7fb78_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 11\" width=\"367\" height=\"48\" \/><\/p>\n<p>(ii) Ferrous sulphate solution-and ferric sulphate solution, (using sodium hydroxide solution)<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052606_c16ca12351_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 12\" width=\"322\" height=\"87\" \/><br \/>\n(iii) Dilute hydrochloric acid and dilute sulphuric acid, (using lead nitrate solution)<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903259242_c50838371f_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 13\" width=\"311\" height=\"131\" \/><br \/>\n(c) Choose the method of preparation of the following salts, from the methods given in the list: <strong>[4]<\/strong><br \/>\n[List: A. Neutralization<br \/>\nB. Precipitation<br \/>\nC. Direct combination<br \/>\nD. Substitution]<br \/>\n(i) Lead chloride<br \/>\n(ii) Iron (II) sulphate<br \/>\n(iii) Sodium nitrate<br \/>\n(iv) Iron (III) chloride<br \/>\nAnswer:<br \/>\n(i) Lead chloride \u2192 Precipitation(B)<br \/>\n(ii) Iron (II) sulphate \u2192 Substitution (D)<br \/>\n(in) Sodium nitrate \u2192 Neutralisation (A)<br \/>\n(iv) Iron (III) chloride \u2192 (Direct combination) (C)<\/p>\n<p>Question 4.<br \/>\n(a) Complete the following equations : <strong>[3]<\/strong><br \/>\n(i) S + cone. HNO<sub>3<\/sub> \u2192<br \/>\n(ii) C + cone. H<sub>2<\/sub>SO<sub>4<\/sub> \u2192<br \/>\n(iii) Cu + dil.HNO<sub>3<\/sub> \u2192<br \/>\nAnswer:<br \/>\n(i) S + 6HNO<sub>3<\/sub> \u2192 H<sub>2<\/sub> SO<sub>4<\/sub> + 6NO<sub>2<\/sub> + 2H<sub>2<\/sub>O<br \/>\n(ii) C + 2H<sub>2<\/sub> SO<sub>4<\/sub> \u2192 2H<sub>2<\/sub>O\u00a0+ CO<sub>2<\/sub> + 2S0<sub>2<\/sub><br \/>\n(iii) 3Cu + 8HNO<sub>3<\/sub> \u2192 3CU(NO<sub>3<\/sub> )<sub>2<\/sub> + 2NO + 4H<sub>2<\/sub>O<\/p>\n<p>(b) Write a balanced chemical equation for the preparation of: <strong>[3]<\/strong><br \/>\n(i) Ethene from bromoethane<br \/>\nAnswer:<br \/>\n+ KOHf (alc.) CH<sub>2<\/sub> = CH<sub>2<\/sub> + KBr+H<sub>2<\/sub>O<\/p>\n<p>(ii) Ethyne using calcium carbide<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052686_6a5ff0bbb0_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 14\" width=\"267\" height=\"65\" \/><\/p>\n<p>(iii) Methane from sodium acetate.<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903259287_4fcec0c308_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 15\" width=\"339\" height=\"55\" \/><\/p>\n<p>(c) Name the following organic compounds : <strong>[4]<\/strong><br \/>\n(i) The compound with 3 carbon atoms whose functional group is a carboxyl.<br \/>\n(ii) The first homologue whose general formula is C<sub>n<\/sub>H<sub>2n<\/sub>.<br \/>\n(iii) The compound that reacts with acetic acid to form ethyl ethanoate.<br \/>\n(iv) The compound formed by complete chlorination of ethyne.<br \/>\nAnswer:<br \/>\n(i) propanone<br \/>\n(ii) ethene<br \/>\n(iii) ethanol<br \/>\n(iv) 1,1,2,2 tetrachloro ethane<\/p>\n<p>Question 5.<br \/>\n(a) Give the chemical formula of: <strong>[3]<\/strong><br \/>\n(i) Bauxite<br \/>\n(ii) Cryolite<br \/>\n(iii) Sodium aluminate<br \/>\nAnswer:<br \/>\n(i) Al<sub>2<\/sub>O<sub>3<\/sub>. 2H<sub>2<\/sub>O<br \/>\n(ii) Na<sub>3<\/sub>AlF<sub>6<\/sub><br \/>\n(iii) NaAlO9<sub>2<\/sub><\/p>\n<p>(b) Answer the following questions based on the extraction of aluminium from alumina by Hall &#8211; Heroult\u2019s Process: <strong>[3]<\/strong><br \/>\n(i) What is the function of cryolite used along with alumina as the electrolyte?<br \/>\n(ii) Why is powdered coke sprinkled on top of the electrolyte?<br \/>\n(iii) Name the electrode, from which aluminium is collected.<br \/>\nAnswer:<br \/>\n(i) Cryolite acts as a solvent and lower the fusion temperature from 2050\u00b0C to 950\u00b0C.<br \/>\n(ii) A layer of powdered coke is sprinkled over the surface of the electrolyte to reduce the heat loss by radiation and prevent the carbon rod from binning in air.<br \/>\n(iii) Cathode<\/p>\n<p>(c) Match the alloys given in column I to the uses given in column II:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903259317_12b7b7ec5c_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 16\" width=\"460\" height=\"150\" \/><br \/>\nAnswer:<br \/>\n(i) Duralumin \u2192 Aircraft body<br \/>\n(ii) Solder \u2192 Electrical fuse<br \/>\n(iii) Brass \u2192 Decorative articles<br \/>\n(iv) Stainless steel \u2192 Surgical instruments<\/p>\n<p>Question 6.<br \/>\n(a) Identify the substances underlined: <strong>[3]<\/strong><br \/>\n(i) The <span style=\"text-decoration: underline;\">catalyst<\/span> used to oxidise ammonia.<br \/>\n(ii) The <span style=\"text-decoration: underline;\">organic compound<\/span> which when solidified- forms an ice like mass.<br \/>\n(iii) The <span style=\"text-decoration: underline;\">dilute acid<\/span> which is an oxidizing agent.<br \/>\nAnswer:<br \/>\n(i) Platinum<br \/>\n(ii) Acetic acid<br \/>\n(iii) Nitric acid<\/p>\n<p>(b) Copper sulphate solution reacts with sodium hydroxide solution to form a precipitate of copper hydroxide according to the equation : <strong>[3]<\/strong><br \/>\n2NaOH + CuSO<sub>4<\/sub> \u2192 Na<sub>2<\/sub>SO<sub>4<\/sub> + Cu(OH)<sub>2<\/sub>\u2193<br \/>\n(i) What mass of copper hydroxide is precipitated by using 200 gm of sodium hydroxide ? [H = 1, O = 16, Na = 23, S = 32, Cu = 64]<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48902527308_55db711b99_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 17\" width=\"374\" height=\"78\" \/><br \/>\n98 g of CU(OH)<sub>2<\/sub> is precipitated by using 80 g of NaOH<br \/>\nl g of CU(OH)<sub>2<\/sub> is preapitated by using [latex]\\frac { 80 }{ 98 }[\/latex]g of NaOH<br \/>\n200 g of CU(OH&gt;2 is preapitated by using [latex]\\frac{80}{98} \\times 200 g[\/latex] = 163.26 g of NaOH<\/p>\n<p>(ii) What is the colour of the precipitate formed ?<br \/>\nAnswer:<br \/>\nPale blue precipitates<\/p>\n<p>(c) Find the empirical formula and the molecular formula of an organic compound from the data given below:<br \/>\nC = 75.92%, H = 6.32% and N = 17.76%<br \/>\nThe vapour density of the compound is 39.5.<br \/>\n[C= 12, H= 1,N= 14]<strong> [4]<\/strong><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052821_ecc53fd269_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 18\" width=\"605\" height=\"200\" \/><br \/>\nEmpirical Formula \u21d2 C<sub>5<\/sub>H<sub>5<\/sub> N<br \/>\nVapour density = 39.5<br \/>\nMolecular Mass = 2 \u00d7 V.D.<br \/>\n= 2 \u00d7 39.5 = 79<br \/>\nEmpirical formula Mass = 12 \u00d7 5 + 5 \u00d7 1 + 1 \u00d7 14<br \/>\n= 60 + 5 + 14<br \/>\n= 79<br \/>\nn = [latex]\\frac { Molecular formula mass }{ Empirical formula mass }[\/latex]= [latex]\\frac { 79 }{ 79 }[\/latex]<br \/>\nThus, both Empirical formula and Molecular formula are C<sub>3<\/sub>H<sub>5<\/sub>N.<\/p>\n<p>Question 7.<br \/>\n(a) Name the gas evolved in each of the following cases : <strong>[3]<\/strong><br \/>\n(i) Altunina undergoes electrolytic reduction.<br \/>\n(ii) Ethene undergoes hydrogenation reaction<br \/>\n(iii) Ammonia reacts with heated copper oxide<br \/>\nAnswer:<br \/>\n(i) Oxygen<br \/>\n(ii) Ethane<br \/>\n(iii) Nitrogen<\/p>\n<p>(b) Study the flow chart given and give balanced equations to represent the reactions A, B and C.<br \/>\nAnswer:<br \/>\n(A) Mg<sub>3<\/sub>N<sub>2<\/sub> + 6H<sub>2<\/sub>O \u2192 3Mg(OH)<sub>2<\/sub> + 2NH<sub>3<\/sub><br \/>\n(B) NH<sub>3<\/sub>+ HCl \u2192 NH4C1<br \/>\n(C) <img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903259422_c5b3f53d2e_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 20\" width=\"323\" height=\"29\" \/><\/p>\n<p>(c) Copy and complete the following table which refers to the industrial method for the preparation of ammonia and sulphuric acid :<strong> [4]<\/strong><br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48902527353_0da1810022_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 19\" width=\"583\" height=\"140\" \/><br \/>\nAnswer:<br \/>\n(i) Haber\u2019s process<br \/>\n(ii)<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052876_07d5e38bc4_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 21\" width=\"261\" height=\"72\" \/><br \/>\n(iii) Contact process<br \/>\n(iv)<br \/>\n<img loading=\"lazy\" src=\"https:\/\/live.staticflickr.com\/65535\/48903052896_024d52d1bb_o.png\" alt=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 - 22\" width=\"248\" height=\"65\" \/><\/p>\n<h4><a href=\"https:\/\/www.aplustopper.com\/icse-previous-papers-solutions-class-10-chemistry\/\">ICSE Class 10 Chemistry Previous Years Question Papers<\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>ICSE Chemistry Previous Year Question Paper 2019 Solved for Class 10 Answers to this Paper must be written on the &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"ICSE Chemistry Question Paper 2019 Solved for Class 10 PDF Download\" class=\"read-more button\" href=\"https:\/\/versionweekly.com\/news\/icse\/icse-chemistry-question-paper-2019-solved-for-class-10-pdf-download\/#more-6805\" aria-label=\"More on ICSE Chemistry Question Paper 2019 Solved for Class 10 PDF Download\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":6806,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[32],"tags":[],"jetpack_featured_media_url":"https:\/\/versionweekly.com\/wp-content\/uploads\/2019\/12\/ICSE-Chemistry-Question-Paper-2019-Solved-for-Class-10-PDF-Download.png","_links":{"self":[{"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/posts\/6805"}],"collection":[{"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/comments?post=6805"}],"version-history":[{"count":0,"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/posts\/6805\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/media\/6806"}],"wp:attachment":[{"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/media?parent=6805"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/categories?post=6805"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/versionweekly.com\/wp-json\/wp\/v2\/tags?post=6805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}