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ICSE Class X Prelims 2025 : Chemistry 2nd prelims (Smt. Sulochanadevi Singhania School, Thane)

7 pages, 41 questions, 20 questions with responses, 20 total responses,

Ugrasen Patel
Mercy Memorial School (MMS), Kanpur
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SMT.SULOCHANADEVI SINGHANIA SCHOOL, THANE Class Subject Exam Date Marks Duration 10 Chemistry Prelim 10.01.2025 80 2 hours No. of the printed side 6 This question paper is divided into two sections. Section A is compulsory. Attempt any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ] SECTION A (40 Marks) (Attempt all questions from this Section) Question 1 Choose the correct answer from the options given below: (i) The catalyst used in the Ostwald process is: (a) (b) (c) (d) (ii) (iii) [15] Manganese dioxide Vanadium pentoxide Iron Platinum Which of the following weighs the least: (N=14, C=12,S=32, Ag=108) (a) 2g-atom Nitrogen (b) 3x1025 atoms of Carbon (c) 1 mole of Sulphur (d) 7g Silver The salt solution which gives chalky white precipitate with sodium hydroxide (in small amount) is: (a) Ferrous Nitrate (b) Zinc Nitrate (c) Lead Nitrate (d) Copper Nitrate (iv) Which statement is not true for electrolysis? (a) Cations migrate towards cathode (b) Anions get reduced during electrolysis (c) Anions discharge at anode (d) Cations get reduced during electrolysis (v) Ionisation potential is maximum in: (a) Alkali metals (b) Alkaline earth metals (c) Halogens (d) Inert gas (vi) The IUPAC name of methyl acetylene is: (a) Butyne (b) Pentyne (c) Propyne (d) Butene 1 (vii) An acid which contains very small amount of water and relatively high percentage of acid in its aqueous solution is called as: (a) (b) (c) (d) Concentrated acid. Dilute acid Strong acid Hydracid (viii) Which among the following alloy is used for making bodies of air crafts (a) Bronze (b) Duralumin (c) Brass (d) Stainless steel (ix) In the given equation, identify the role played by conc. Nitric acid (a) (b) (c) (d) (x) + + + Non-Volatile acid Reducing agent Oxidising agent Dehydrating agent Smita tried to plate the pan with copper but was not successful in the beginning. Which of the following can help Smita to, copper plate this pan? (a) To change DC to AC. (b) To change the electrolyte from copper sulphate to cobalt sulphate. (c) Connect the pan to the negative electrode. (d) To induce a higher current. (xi) The number of C-H bonds in ethane molecule are: (a) four (b) six (c) eight (d) ten (xii) Anita wants to prepare Lead carbonate from lead nitrate. Identify the most suitable reactants Anita should choose: (a) Lead nitrate + copper (II) carbonate (b) Lead nitrate + zinc carbonate (c) Lead nitrate + sodium carbonate (d) Lead nitrate + carbonic acid (xiii) The alkyl group in the butanal is (a) (b) (c) (d) Methyl Ethyl Propyl Butyl (xiv) Following questions consist of two statements- Assertion (A) & Reason (R). Answer the following question by selecting the appropriate option: Assertion(A): Baeyer s process is used in extraction of aluminium from its main ore. Reason(R): Baeyer s process is done for refinement of aluminium. 2 (a) (b) (c) (d) Both A & R are false and R is not correct explanation of A. A is true but R is false. Both A & R are true and R is correct explanation of A A is false but R is true (xv) The drying agent used to dry hydrogen chloride is (a) Quick lime (b) Conc. Sulphuric acid (c) Anhydrous calcium chloride (d) Phosphorous pentoxide Question 2 i) The figure given below illustrates the lab preparation of Hydrogen chloride: Study the figure given below and answer the questions that follow. [5] a) Write the reaction for lab preparation of hydrogen chloride as shown in diagram above. b) Identify the two roles played by conc. sulphuric acid in this method. c) How do we prepare hydrochloric acid from hydrogen chloride gas? d) Complete the following sentence. The acid obtained above dissociates in its aqueous solution to produce _______ H + ion (one, two) per molecule hence it is a _________ acid (monobasic, dibasic) e) Explain why dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2% ii) Match the column A to column B and write your answers as Column A (a) (b) (c) (d) (e) Cu + Sn + Zn Ethyl alcohol + pyridine Ethane + Oxygen FeCl3 + NaOH Pb + Sn (a-1, b-2 .) [5] Column B 1. Reddish brown ppt 2. Solder 3. Denatured alcohol 4. Bronze 5. Blue non-luminous flame 6. Spurious alcohol iii) 1. Fill in the blanks by choosing the correct options given in the brackets: [2] (a) pH of acetic acid is greater than dilute sulphuric acid. So acetic acid contains_______ concentration of H+ ions. [greater/ same/ low] (b) When zinc is added to solution X (pH value 1) & to solution Y (pH value 14) respectively_________ gas/gases is/are evolved. [ H2 & O2 / only H2 / H2 & Cl2] 2. Solve: (a) From the equation CaCO3 + 2HCl CaCl2 + H2O + CO2 , calculate the weight of 3 CaCl2 obtained from 10g of CaCO3 and the volume at s.t.p. of CO2 obtained at same time. [Ca=40, C=12, O=16, H=1, Cl=35.5] [2] (b) If 150 cc of gas A contains X molecules, how many molecules of gas B will be present in 450cc of gas B. The gases A & B are under the same conditions of temperature and pressure. [1] iv) Identify the following: [5] (a) A series of compounds having similar structure and chemical properties in which the successive compounds differ by a CH2 group. (b) The pair of electrons in an atom that do not take part in bond formation. (c) The naturally occurring minerals from which metals can be extracted profitably and conveniently. (d) Process of separation of ions already present in an ionic compound. (e) The amount of energy released when an atom in a gaseous state accepts an electron to form an anion. v) 1. Give the IUPAC name of the following compounds: [2] (a) (b) CH3 CH CH3 CHO 2. Draw structures for the following organic compounds:- [3] (a) 2-chloro butanoic acid (b) propan-2-ol (c) 2-bromo-4-chloro pentane SECTION B (40 Marks) Attempt any four questions from this Section. Question 3 (i) The diagram shows an experimental setup for laboratory preparation of a pungent smelling gas which is alkaline in nature. [5] (a) (b) (c) (d) (e) Write balanced chemical equation for the above preparation. State the method of collection of this gas and reason out for the same. Why ammonium nitrate is not used in the above method preparation? Write a balanced chemical equation when the above gas reacts with excess chlorine State you observation When this gas is burnt in an atmosphere of oxygen in absence of catalyst. 4 (ii) Choosing the substances from the list given below write balanced chemical equations for lab preparation of following salts: [3] List: Dil sulphuric acid, Iron, zinc, chlorine, copper (II) carbonate, zinc chloride, sodium chloride, lead nitrate, dil. Hydrochloric acid. Salts: (a) Zinc sulphate (b) Iron (III)chloride (c) Lead (II)chloride (iii) Give one chemical test to distinguish between the following pairs of compounds: [2] (a) Potassium nitrate solution and sodium chloride solution (b) Zinc sulphate solution and zinc chloride solution Question 4 (i) Recall the industrial process of manufacturing Sulphuric acid and answer the following questions: (a) Write a balanced chemical equation showing formation of SO3 in Contact tower. [1] (b) Give reason for the following: 1. Sulphuric acid is diluted by adding conc. sulphuric acid to water. 2. Gases entering the Contact tower should be free from impurities. [2] (ii) Magnesium ribbon is added to dilute HCl. A gas P is liberated along with the formation of a compound Q . Draw an electron dot diagram to show the structure of Q . [2] (iii) Write proper observation for the given statements [5] (a) Few drops of methyl orange is added to a beaker containing solution of ammonium hydroxide and dilute HCl. (b) Sodium hydroxide is added first in small amount and then in excess in lead nitrate solution. (c) Ammonium nitrate is strongly heated in a test tube. (d) Neutral FeCl3 is added to acetic acid solution. (e) Copper sulphide reacts with dilute hydrochloric acid. Question 5 (i) XBr2 is an ionic compound. Answer the following questions pertaining to XBr 2. [3] a) The physical state of the above ionic compound will be______ (crystalline solid/ gas) b) The force of attraction acting between the ions of XBr2 are ___________(Vander Waal forces/ Electrostatic forces) c) If XBr2 is electrolysed using Graphite electrodes, what will be the product obtained at anode? (ii) Complete the table below pertaining to the electrolysis: Electrolyte Electrode [4] Ions discharged at cathode Reaction at anode Sodium argentocyanide Active Ag+1 ions (a) Acidulated water Inert (b) (c) Dilute NaCl solution Inert (d) (e) 5 (iii) The reaction 2N2O + CH4 CO2 +H2O +N2 , takes place in gaseous state. If all volumes are measured at same temperature and pressure, calculate the volume of dinitrogen oxide required to give 150 cm3 of steam. [1] (iv) Draw structures of two isomers of Butane. [2] Question 6 (i) Write balanced equations for the following reactions: [5] (a) Dry ammonia gas is passed over heated copper oxide. (b) Reaction of ethanol with acetic acid in presence of conc. H2SO4 (c) Dehydration of ethanol in presence of conc H2SO4 (d) A mixture of sodalime & sodium acetate is heated. (e) Sulphur reacts with conc. Nitric acid. (ii) Copy and complete the table Series [5] IUPAC name (a) Molecular formula of first member of series CH4 Carboxylic acid (b) (c) (d) HCHO (e) Methane Question 7 (i) A compound X consists of 4.8% carbon and 95.2% bromine by mass(C=12, Br= 80) Determine the empirical formula of this compound working correct to one decimal place. If the vapour density of the compound is 252. What is the molecular formula of this compound? [3] (ii) Liquor ammonia dissociates in water and forms a positive ion and a negative ion. Draw the structure of the negative ion. [2] (iii) The following is a sketch of an electrolytic cell used in extraction of aluminium: [5] (a) Name this electrolytic process and also write the formula chief ore of aluminium. (b) What are the two electrolytic compounds added in Electrolyte C. (c) Why is it necessary for the electrode B to be continuously replaced? (d) Write the reaction taking place at electrode A & B. 6 Question 8 (i) The questions given below refers to the Modern Periodic Table [4] (a) What happens to the atomic size of elements moving from top to bottom of a group? Justify. (b) What type of bonding will be present in the chloride of the element with atomic no.1? (c) An element has atomic number 16. State the period and the group to which it belongs. (d) Write the correct symbol > [greater than] or < [smaller than] in the statements: 1. The ionisation potential of potassium is ____ that of sodium. 2. The electronegativity of fluorine is_____ that of chlorine. (ii) Calculate the number of Hydrogen atoms in 0.25 moles of H2SO4 [O=16,H=1,S=32] [1] (iii) State which is odd one, support your answer with reason. [2] (a) Magnetite, Haematite, Calamine, Iron pyrites. (b) C2H2, C3H4, C4H8, C5H8 (c) Froth flotation, Magnetic separation, Hydrolytic method, Calcination. (iv) Define: (a) Avogadro s law (b) Electroplating. ************************************************************************ 7

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