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ICSE Class X Prelims 2024 : Chemistry (Karnataka ICSE Schools Association KISA, Bengaluru)

8 pages, 80 questions, 65 questions with responses, 70 total responses,

Rahul Mukherjee
Centre for Management Studies, Orissa Engineering College, Bhubaneswar

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XPreparatory Examination2024 Subject: CHEMISTRY (SCIENCE PAPER 2) Maximum Marks: 80 Time Allowed: Two hours Date: ii. The atomic masses of oxygen(0), fluorine(F) and neon(Ne) are 16, 19 and 20 respectively. Which of the following statements regarding the volume of gases at STP in 16 g of oxygen, 19 g of fluorine and 20 g of neon is correct? M. 16g of oxygen will occupy half the volume occupied by 20 g of neon. N. 20 g of neon willoccupy twice the volume occupied by 19 g of fluorine. (a) Both M and N (b) Only M (c) OnlyN (d) Neither M nor N iv. Hydrogen chloride gas is passed through conc. sulphuric acid and collected in a jar. Moist blue litmus paper is exposed to the gas in the jar. What do you observe? (a) It remains blue (b) It gets bleache (c) It turns red (d) It turns red then gets bleached V. Sulphur eacts with hot conc. nitric acid producing sulphuric acid, water and nitrogen dioxide. The property of nitric acid emphasised here is (a) Acid property (b) Oxidizing nature (c) Reducing nature (d) Dehydrating property vi. Which among the following conditions does not hold true for electroplating? (a) Direct current should be used. (b) The electrolyte must contain ions of the base metal to be electroplated. (c) A lowcurrent for a prolonged period of time must be used. (d) The metal to be plated on the article is made the anode. vi. The acidity is 3 for (a) Ammonium hydroxide (b) Copper hydroxide (c) Zinc hydroxide (d) Ferric hydroxide KARNATAKA ICSE SCHOOLSASSOCIATION ICSE STD. X Preparatory Examination 2024 Subject: CHEMISTRY (SCIENCE PAPER 2) Time Allowed: Two hours Maximum Marks: 80 Date: B B+2 vii. A>A; Number of electron present in the valence shell and the type of element of atoms A and B respectively are: Number of electrons in valence shell W X Y (a) (b) (c) (d) 3,2 5,2 3,6 5,3 Type of Elements Non-metal, non-metal Non-metal, metal Metal, non-metal Non-metal, metal w X Y Z ix. Salt of Fe2* ion will be of the colour (a) Green (b) Brown (c) Pink (d) Yellow X. An element with atomicnumber will forma base when its oxide is dissolved in water. (a) (b) (c) (d) 17 7 15 19 xi. Reaction between ammonia and chlorine produces a yellow explosive liquid of nitrogen trichloride. The ratio of ammonia: chlorine is (a) 1:2 (b) 2:1 (c) 1:3 (d) 3:1 KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. XPreparatory Examination 2024 Subject: CHEMISTRY (SCIENCE PAPER 2) Time Allowed: Two hours Maximum Marks: 80 xii. Date: -CHOfunctional group is present in (a) Butanal (b) Ethanol (c) Propanone (d) Methanoic acid Cu2* Cu. This is an example for xiii. (a) Oxidation (b) Reduction (c) Redox reaction (d) None of the above xiv. The promoter used in Haber's process (a) (b) (c) (d) Pt Fe K2O Mo A negative divalent element will belong to which group? (a) Group 2 (b) Group 13 XV. (c) Group 14 (d) Group 16 Question 2 i. Complete the following sentences by choosing the correct answers from the brackets: (a) If an element has seven valence clectronsthen it is likely to have the (smallest/largest) electron affinity among all the elenments in the same period. (b) (c) A (Aceticacid / phosphoric acid) forms two acidic salts. (Chalky/gelatinous) white precipitate is formed when sodium hydroxide is added to a solution of lead nitrate. (d) (e) An colourless. (Alkynes/ Alkanes) undergo characteristic addition reaction. (Alkaline/acidic) solution willturn alkaline phenolphthalein i. (Attempt H of X to to in X. X. (3] and a [2] [2] H ammonia and reacts and wi t h solution affinity Ypower of any a write is element coppersoluble is with H likely four reacts of of exhibited a a SECTION B Y X Oxide balanced Y questions salt. compound to is is with is be greater producing placed salt in equation each from Z solution than to to of this (more/less) give the (more/less) the that copper for left of following a the Section.) (=C-C-HH--of salt Fe" or element along following: to as as MgClz, i o n thcompared e with compared cases: Y. producing right waterand water of acid reactant the H-C-C-C-C-H i. Question 3 What Identify Hydrochloric dioxide. sulphur a) b) property gas. Its Its The nitrogen precipitate reaction aqueous reducing electron whether periodic table.the State electronegativity c)The b) a) i i. The H H H compound: organic 2. the following H name.of H H can be 5] and hydrogen carbon ICSE X ASSOCIATION SCHOOLS Date: 2024 2) of Two (SCIENCE which an hours atom.containingExamination metals PAPER from compounds: extracted for the following formula compounds on Prep ratory Time structural minerals the organic CHEMISTRY nucleus Allowed: Subject: STD. ICSE KARNATAKA Maximum Marks:80 (c) naturallyThe(e) (d) 2-Pentyne Propanoic acid3. 2. 1. (a) (b) TheAliphatic, only. conveniently. 2,profitablyand 1. 2-Dichloro Draw positive Give the open the charge branched occurring Butane IUPAC chain V. KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. XPreparatory Examination 2024 Subject: CHEMISTRY (SCIENCE PAPER 2) Maximum Marks: 80 Time Allowed: Two hours Date: iv. (a) State whether the following statement are TRUE or FALSE. Justify your answer: [2] 1. In the formation of JaM,the element Mhas accepted 2 electrons and its metallic in nature. 2. In the formation of acovalent compound, if the molecule consists ofa double bond then the shared pair of electrons is three pairs. (b) Calculate the number of molecules in 15 grams of sulphur dioxide. [RMM of sulphur dioxide = 64] [1] Question 4 i. The following questions relate to the extraction of Aluminium: a) Name the chemical used in the concentration of the ore. [2] b) Alayer of powdered coke is sprinkled over the electrolytic mixture. Give reason. i. 35 g of agas forms 15,000 cm' of vapours at STP. Calculate the molecular weight of the gas. ii. Write the balanced chemical equation for cach of the following: [2] [3] a) Action of conc. sulphuric acid on sodium nitrate. b) Catalytic oxidation of ammonia. c) Dehydrohalogenation of 1, 2-Dibromo ethane with alcoholicpotassium hydroxide. iv. With respect to Contact Process answer the following: [3] a) Catalyst used in the contact tower. b) Temperature of the reaction in the contact tower. c) Balanced equation for the formation of pyrosulphuric acid. Question 5 i. Ethan wants to differentiate between sulphur dioxide gas and hydrogen [2] sulphide gas in the laboratory. He has been given moist lead acetate paper. a) Howwill he differentiate the two gases? b) What is the odour of hydrogen sulphide gas. i. Name the alloy which is having the following metals as its main component: (2] a) Aluminium b) Iron KARNATAKAICSE SCHOOLS ASSOCIATION ICSE STD. XPreparatory Examination 2024 Subject: CHEMISTRY (SCIENCE PAPER 2) Maximum Marks: 80 Time Allowed: Two hours Date: ii. Dany takes awhite powdered salt Win a test tube. On heating it produces abuff yellow residue. Wis dissolved in water. Magnesium is added to one part of the solution and to the other part sodium sulphate solution is added. [3] a) ldentify the compound W. b) Name the salt obtained when magnesium is added to W. c) Write the formula of the precipitate obtained when Wis treated with sodium sulphate solution. iv. State scientific reasons for each of the following statements: a) Alkenes are known as olefins. b) Laboratory preparationof alkanes from sodium acetate is called as decarboxylation. [3] c) In catalytic oxidation of ammonia, the platinum continues to glow even after the heating is discontinued. Question 6 i. Name the following: [2] a) The main ore of iron. b) The ore of aluminium containing sodium. ii. State one observation in each of the following: a) Conc. hydrochloric acid is added to manganese dioxide. b) Hydrogen chloride gas is passed through silver nitrate solution. ii. Acidified water is electrolysed using platinum electrode. a) At which electrode does hydrogen gas gets released? [2] [3] b) The current is passed for a prolonged period of time before collecting the gases. Why? c) Write the reaction that takes place at anode. iv. X(2, 8, S] and Y[2, 8,3] are two elements. Using the information complete the following: a) Metalatoms tend to [31 electrons to achieve stable electronic configuration. b) c) will form trivalent negative ion/radical. is an oxidizing agent. ARATAN4, KARNATAKA ICSE SCHOOLS ASSOCIATION ICSE STD. XPreparatory Examination 2024 Subject: CHEMISTRY (SCIENCEPAPER 2) Maximum Marks: 80 Time Allowed: Two hours Date: Question7 i. The empirical formula of an organic compound is CHCI; and its molecular weight is 168. Find the molecular formula. [Atomic weights; C-12; H-1; Cl-35.5] ii. Joel prepared a solution R that has a pH 7. What willbe the effect on the pH on addition of the following? a) Sodium hydroxide solution. b) An acidic solution. ii. Which is the most electronegative element in period 2? iv. 12.6g of Copper oxide is obtained on thermal decomposition of copper carbonate. CuCO; CuO + CO% [3] (2] [1] [4) Calculate the following: a) Mass of copper carbonate initially taken. b) Volume of carbon dioxide at STP. [Atomic weights: Cu-63.5; C-12; O-16] Question 8 i. Differentiate between the following on the basis of the parameters given in the brackets: [2] a) Ferrous sulphate and ferric chloride (Sodium hydroxide solution) b) Acidic and alkaline solutions (addition of sodium carbonate) i. Draw the electron dot structure for ammonium ion. ii. Write the balanced chemical equation for the following: (2] (3] a) Laboratory preparation of ammonia from magnesiurn nitride. b) Conversion of ethyl alcohol to ethyl ethanoate. c) Complete oxidation of ethane. iv. ldentify the following: a) The oxidizing electrode. b) The acidic gasproduced when sodium sulphide reacts with dilute hydrochloric acid. c) Type of acid that does not produce acidic salts. (3]

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