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ICSE Class X Prelims 2023 : Chemistry (Hiranandani Foundation School (HFS), Thane)

6 pages, 44 questions, 43 questions with responses, 47 total responses,

Jai Badani
Kohinoor International School (KIS), Mumbai

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HIRANANDANI FOUNDATION SCHOOL, THANE First Preliminary Assessment, November 2022 Subject: Chemistry CLASS: X Time: Two hours DATE: 30/11/2022 Max Marks: 80 __________________________________________________________________ Answers to this paper must be written on the separate answer sheet. The time given at the head of this paper is the time allotted to write the answers. This question paper consists of 06 printed pages. ______________________________________________________________________________ Section A is compulsory. Attempt any four questions from Section B. The intended marks for each question or sub-question are given in the brackets [ ]. SECTION A (Attempt all questions from this Section) Question 1 Choose one correct answer from the given options: i) A strong electrolyte is: a) Magnesium hydroxide b) Carbon tetrachloride c) Lithium hydroxide d) Acetic acid ii) Ionization potential across a period increases because the: a) Atomic radius and nuclear charge increases b) Atomic radius decreases and nuclear charge increases c) Atomic radius and nuclear charge decreases d) Atomic radius increases and nuclear charge decreases iii) A polar covalent compound is: a) CCl4 b) NaCl c) CH4 d) HCl iv) The main components of fuse metal are: a) Copper and Tin b) Lead and Tin c) Iron and Nickel d) Lead and Zinc v) The hydroxide which is soluble in excess of NH4OH is: a) Ferrous hydroxide b) Lead [II] hydroxide c) Copper [II] hydroxide d) Calcium hydroxide vi) A di-acidic base is: a) Ferric hydroxide b) Ammonium hydroxide c) Aluminium hydroxide Page 1 of 6 [15] d) Cupric hydroxide vii) If the RMM of acetic acid is 60, then its vapour density is: a) 30 b) 120 c) 66 d) 88 viii) The drying agent which is used to dry Ammonia gas is: a) Fused Calcium chloride b) Conc. Sulphuric acid c) Quick lime d) Phosphorous pentoxide ix) An aqueous solution which turns the colour of Methyl orange from orange to pink is: a) Dil. Hydrochloric acid b) Human blood c) Ammonium hydroxide d) Sodium hydroxide x) The catalyst used in Ostwald s process is: a) Nickel b) Finely divided Iron c) Granulated zinc d) Platinum xi) The gas formed when copper reacts with conc. Sulphuric acid is: a) Sulphur trioxide b) Sulphur dioxide c) Oxygen d) Hydrogen xii) Fused alumina is reduced to aluminium by electrolytic reduction, since: a) Alumina is highly stable b) Alumina is least stable c) Alumina is not reduced by drying agents d) Alumina is in impure state xiii) During the electrolysis of acidified water, which of the following takes place? a) Hydrogen is released at anode b) Oxygen is released at cathode c) Oxygen is released at anode d) OH- ions are getting reduced preferentially xiv) An element in the period 3, whose electron affinity is zero is: a) Chlorine b) Neon c) Sodium d) Argon xv) Hydracids are those acids which contain: a) Hydrogen and a metal b) Hydrogen, a non-metal and Oxygen c) Hydrogen and a non-metal other than Oxygen d) Hydrogen and Oxygen only Question 2 i) With respect to laboratory preparation of an acidic gas, answer the questions that follow the diagram given below: [5] Page 2 of 6 a) Name the gas collected in the gas jar B b) Name the substance A and state its use c) Write a balanced chemical equation for the reaction which takes place in the round bottom flask below 200 C d) How is the gas produced above collected? e) Conc. Nitric acid cannot be used as a reactant for the above preparation. Explain. ii) Match the column A with column B (Use each option only once) Column A [5] Column B a) Lead hydroxide 1. Reddish brown b) Zinc oxide 2. Highest electronegativity c) Zinc hydroxide 3. Yellow when hot white when cold d) Bromine 4. Soluble in excess sodium hydroxide e) Fluorine 5. Soluble in excess ammonium hydroxide iii) Complete the following by choosing the correct answers from the bracket. [5] a) Potassium sulphite on reacting with dil. HCl releases ______ (SO2/H2S) b) Carbon tetrachloride is miscible in _________. (Water/Benzene) c) Brown ring test is used for the identification of ______ ions. (SO42-/NO31-) d) ________ gas is produced during catalytic oxidation of ammonia. (Nitric oxide/Nitrogen) e) ______ element is placed in the period 2 and group 15 of the modern periodic table. (Phosphorus/Nitrogen) iv) State the following: [5] a) The name of the process by which Sulphuric acid is manufactured. b) A type of bond formed between atoms of non-metallic elements having large difference in their electronegativities. c) The formula of zincate of an element with electronic configuration (2,8,8,1). d) Metallic atoms present in Fluorspar. e) The amount of energy released when an atom in the gaseous state accepts an electron to form an anion. v) a) Draw the electron dot structure for the following molecules: 1. Magnesium chloride 2. Water 3. Carbon tetrachloride [3] b) State two observations pertaining to action of heat on Lead [II] nitrate. [2] Page 3 of 6 Section B (Attempt any four questions) Question 3 i) Identify the anion present in each of the following compounds: a) A glass rod dipped in ammonia solution when brought near the vapours of compound A gives dense white fumes. b) When dilute sulphuric acid is added to compound B , a gas is produced which turns lime water milky and acidified KMnO4 solution from pink to colourless. [2] ii) Complete and balance the equations: [3] a) Ca3N2 + H2O b) C + HNO3(conc.) c) KHCO3 + H2SO4 (dil.) iii) Arrange the following as per the instructions given in the brackets: a) Mg, Na, S, Si (decreasing order of atomic size) b) Al, S, Cl, Na (increasing order of ionization potential) c) Cs, Na, Li, Rb (increasing order of metallic character) [3] iv) Fill in the blanks selecting the appropriate word from the given choice: [2] a) _________ molecule has a double covalent bond and four lone pairs of electrons. [Water/Oxygen] b) __________ compounds have molecules as their constituent unit. [Covalent/ Electrovalent]. Question 4 i) ii) Depict with the help of electron dot structure, the formation of Ammonium radical from Ammonia. State the role played by each of the following substances in the process of extraction of Aluminium: a) Sodium hydroxide b) A layer of powdered coke which is sprinkled over the electrolytic mixture. [2] [2] iii) Answer the following questions: [3] a) 500mL of gas X at s.t.p. weighs 0.18 g. Calculate the Vapour density of gas X . [ 1L of H2 at s.t.p. weighs 0.09 g]. b) Write the empirical formula of cane sugar. c) State Gay Lussac s law of combining volumes. iv) Explain the following: [3] a) In the absorption tower the SO3 vapours are absorbed in conc. H2SO4 and not in water. b) During the laboratory preparation of Ammonia, ammonium nitrate is not used as a reactant. c) Magnalium is used in the construction of aircrafts. Question 5 i) Name the probable cation present in the given compounds, based on the following observations: [3] a) Deep blue coloured compound forms a black residue on heating and liberates a reddish-brown gas. b) Dirty green precipitate insoluble in excess of sodium hydroxide. Page 4 of 6 c) White water-soluble salt that liberates pungent smelling gas on heating with alkalis. ii) Give balanced chemical equations for the following reactions: a) Action of dil. Nitric acid on Iron [III] hydroxide. b) Reaction of Ammonia with excess of Chlorine. c) Reaction of Manganese dioxide with conc. HCl. iii) What volume of oxygen is required to completely burn 90dm3 of butane under similar conditions of temperature and pressure? 2C4H10 + 13O2 8CO2 + 10H2O iv) Find the % of Magnesium in hydrated Magnesium nitrate (Mg(NO3)2.6H2O) [Atomic weights: Mg=24, N=14, O=16, H=1] [3] [2] [2] Question 6 i) Define: a) Electroplating b) Ore [2] ii) Choose the role played by sulphuric acid as A, B, C, D which is responsible for the reactions 1 to 4. A: as an oxidising agent B: as an acid C: as a dehydrating agent D: as a non-volatile acid [4] Conc. H2SO4 1. CuSO4.5H2O CuSO4 + 5H2O 2. S + 2H2SO4 (conc.) 3SO2 + 2 H2O <200 C 3. KNO3 + H2SO4 (conc.) 4. CuO + H2SO4 (dil.) iii) iv) KHSO4 + 2HNO3 [vap.] CuSO4 + H2O Write balanced chemical equations for the following two steps of the Bayer s Process: a) Conversion of Sodium aluminate to Aluminium hydroxide. b) Conversion of Aluminium hydroxide to pure Alumina. Arrange the following ions in the increasing ease of getting discharged: a) Cu2+, Al3+, Fe3+, Ca2+ b) Cl1-, NO31-, I1-, SO42- [2] [2] Question 7 i) Identify the gas/es liberated in the following reactions: a) Reaction of Calcium carbonate with dil.HCl. b) Reduction of CuO by Ammonia. c) Electrolysis of acidified aqueous CuSO4 using inert electrode. (at Anode) ii) A compound has the following percentage composition by mass: Carbon = 54.55%, Hydrogen = 9.09%, Oxygen = 36.26 %. If the vapour density is 44, find the empirical and molecular formula of the compound. [Atomic weights: H= 1, C= 12, O= 16] iii) Write the chemical formula of the following ores: a) Calamine b) Magnetite Page 5 of 6 [3] [3] [2] iv) With reference to the electrolysis of molten Lead[II]bromide, answer the following questions: [2] a) Why is the graphite anode preferred for this process? b) Write the equation for reaction at cathode. Question 8 i) Distinguish between the following compounds with the help of one chemical test. (balanced equations are not required). [2] a) CuO and MnO2 (using conc. HCl) b) Sodium sulphide and Sodium sulphite (using dil. HCl) ii) With reference to the Hall Herault s process, answer the following questions: [3] a) Name the two compounds of Aluminium which are present in the electrolytic mixture. b) Why is it necessary to replace the anode periodically? c) Write the balanced equation for the reaction at cathode. iii) Write a suitable word or a phrase for the following: [2] a) The compound formed by partial replacement of [H+] aq. ions of an acid by a basic radical [metallic ion or ammonium ion] b) A complex salt used as an electrolyte in the electroplating of Silver. iv) An element Z is present in the period 3 and group 2 of the periodic table. [3] a) State whether element Z will undergo oxidation or reduction while forming ions? b) Write the formula of Sulphite of Z . c) Which of the following two will have a larger atomic size an atom of element Z or an ion of element Z ? ***************************************************************************** Page 6 of 6

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