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ICSE Class X Mid-term Vibgyor High 2021 : Chemistry

8 pages, 100 questions, 1 questions with responses, 1 total responses,

Vedaant Malik
Vibgyor High School, Goregaon West, Mumbai

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VIBGYOR HIGH First Term Examination 2020-2021 CHEMISTRY Grade: X Max. Marks : 80 Date : 29/09/2020 Time Allowed: 2 hours INSTRUCTIONS: Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. The intended marks for the questions or parts of questions are given alongside the questions. Attempt all questions from Section I and Four questions from Section II, Four out of Six questions. _________________________________________________________________________ SECTION I (40 marks) Attempt all questions from this section Q.1 A) Fill in the blanks: (i) [5] The salt formed when sulphuric acid reacts with excess sodium hydroxide solution is__________________. (ii) ______________is a normal salt of sodium formed from nitric acid. (iii) The periodic property which refers to the character of the element, which loses one or more electrons when supplied with energy is_______________. (iv) The electrode at which anions donate excess electrons and are oxidized to neutral atoms is the _____________________. (v) The impurity which separates out on addition of a concentrated solution of alkali to impure bauxite is ________________________. 1 B) Give one word or phrase for the following statements: (i) [5] A compound which when dissolves in water yields hydronium ions as the only positively charged ions. (ii) An alloy of zinc used in electrical fittings. (iii) A liquid which can be dehydrated to produce ethene gas. (iv) The gas released when lead reacts with hot and concentrated sodium hydroxide. (v) The most non metallic element from the elements S, P, Cl and Ar. C) [5] (i) (ii) Draw the structural formula of the following compounds: (a) 2-Chloro-3-methyl pentane (b) Iso-butane (c) 3-methyl pent-1-yne Give the IUPAC names of the following: (a) CH2 = CH- CH2 - CH3 (b) D) Choose the correct answer: (i) [5] Electrolysis of molten lead bromide using inert electrodes will produce _______________ at the cathode. (ii) (a) Lead metal (b) Bromine gas (c) Hydrogen gas (d) Oxygen gas Stainless steel is an alloy of _____ (a) Iron, carbon and manganese (b) Iron, chromium, nickel and carbon (c) Iron, chromium, manganese and nickel (d) Iron, nickel and carbon 2 (iii) (iv) A Base which is not an alkali (a) Sodium hydroxide (b) Ferric hydroxide (c) Ammonium hydroxide (d) Potassium hydroxide If the empirical formula of an organic compound is CH2O, then its molecular formula is: (v) E) (a) C2H2O2 (b) C6H12O6 (c) C2H4O (d) C3H6O2 From the following, _______is an alkaline earth metal. (a) Potassium (b) Calcium (c) Lead (d) Copper State one relevant observation:(i) Sodium hydroxide solution is added to ferric sulphate solution. (ii) pH paper is introduced in sodium hydroxide solution. (iii) Sodium hydroxide solution is added to calcium nitrate solution. (iv) Ethane reacts with excess of oxygen. (v) Electricity is passed through liquid carbon tetrachloride in the electrolytic [5] cell, having a bulb. F) State one relevant reason:(i) Ethene is more reactive than ethane. (ii) The ionization potential increases across the period. (iii) An aqueous solution of sodium chloride conducts electricity. (iv) Electron affinity of noble gas elements is zero. (v) Cryolite and fluorspar are added to the electrolytic mixture during [5] electrolysis of alumina. 3 G) Write balanced equation for each of the following reactions: (i) [5] Aluminium hydroxide is added to hot and concentrated potassium hydroxide. H) (ii) Dehydration of ethanol in presence of aluminium oxide at 350oC. (iii) Ammonium hydroxide is added to zinc sulphate solution. (iv) Excess of potassium hydroxide is added to dilute sulphuric acid. (v) Excess of sodium hydroxide is added to dilute phosphoric acid. (i) Determine the empirical formula of a compound whose percentage composition is as follows: C=68.84%, H=4.95%, O=26.20%. [C=12, H=1, O=16] (ii) [3] A gaseous hydrocarbon weighs 0.70g and contains 0.60g of carbon. Find the molecular formula of the compound if its molecular weight is 70. [C=12, H=1] [2] SECTION II (40 marks) Attempt any four questions from this section Q.2 A) Write balanced equation for each of the following reactions: (i) [3] Dehydrohalogenation of ethyl bromide using alcoholic potassium hydroxide. B) (ii) Reaction of ethene with chorine in the presence of inert solvent. (iii) Reaction of aluminium with hot and concentrated sodium hydroxide. Differentiate between the following based on information given in the brackets: C) (i) Propane and Propene (Type of bonds between carbon atoms). (ii) Electrolytic Dissociation and Ionisation (Production of ions). (iii) Alkali metals and Halogens ( Electronegativity). Answer the following questions:(i) [3] [4] Why does sulphuric acid form two types of salts with sodium hydroxide solution? (ii) Why is fluorine the most electronegative element of the periodic table? 4 (iii) Why is sodalime used in preference to sodium hydroxide in laboratory preparation of methane? (iv) Pure water is a non-electrolyte but becomes an electrolyte on addition of dil. H2SO4. Give a reason. Q.3 A) B) Draw the structure of the following compounds: (i) Pentan-2-ol (ii) 2-chloro propane (iii) But-2-ene [3] Complete the following table with reference to electrolysis of copper sulphate solution: Reaction at [3] Using Active Using Inert electrodes electrodes Cu-2e Cu2+ _______________ Copper is formed _______________ ___________________ Blue colour fades anode Product formed at cathode Colour change in electrolyte 5 C) Write balanced chemical equation for each of the following conversions: (i) Aluminium hydroxide from sodium aluminate. (ii) Hydroxyl ions present in acidified water to oxygen gas during [4] electrolysis. (iii) Copper hydroxide from copper(II) sulphate using ammonium hydroxide. (iv) Sodium chloride from dilute hydrochloric acid. Q.4 A) B) Write balanced equation for each of the following reactions: (i) Electrolytic dissociation of copper chloride. (ii) Reaction at cathode during electrolysis of acidified water. (iii) Reaction of insufficient sodium hydroxide with dilute sulphurous acid. Give reasons: (i) A cation is always smaller than the parent atom. (ii) A low current is preferred for electroplating. (iii) Lead bromide undergoes electrolytic dissociation in the molten state but [3] [3] is a non-electrolyte in the solid state. C) Answer the following with reference to extraction of aluminium. (i) [4] Why is fused alumina electrically reduced to aluminum by the process of electrolysis only? (ii) Why is the anode changed from time to time? (iii) Write the reactions taking place at cathode and anode. Q.5 A) Define Isomers. Draw two chain isomers of pentane. [3] B) Calculate: [5] (i) Determine the molecular formula and empirical formula of a hydrocarbon which contains 84% carbon. Its relative molecular mass is 200. Find the vapour density of the compound. [At.wt of C=12,H=1] 6 (ii) An experiment showed that in a lead chloride solution, 207 g of lead combined with 142 g of chlorine. What is the empirical formula of this chloride? [Pb=207, Cl=35.5] C) Name the following: (i) [2] The state in which cryolite is added for dissolving Al2O3, in the Hall Heroult s process. (ii) It represents the strength of acids and alkalis expressed in terms of hydrogen ion concentration. Q.6 A) B) Give balanced equation for the following reactions: (i) Reaction at the anode during electrolysis of molten lead bromide. (ii) Zinc sulphate solution is added to sodium hydroxide solution. (iii) Dissociation of sulphuric acid. Name the following: (i) [3] [3] The cation which in solution gives a dirty green precipitate with NaOH solution. C) (ii) The indicator which determines the strength of acidic or alkaline solution. (iii) The sulphite of the element in period -3, group 1[IA]. Answer the following questions: (i) Define a base. (ii) Differentiate between Zn2+ and Pb2+ using ammonium hydroxide solution. (iii) Select the right answer(a) [4] Down the group, electron affinity___________________[increases, decreases, remains same] (b) Across a period, the ionization potential ______________________ [increases, decreases, remains same] Q.7 A) Define the following: (i) Electron affinity. (ii) Electroplating. (iii) Acid salt. [3] 7 B) C) Arrange the following as per the instruction given in the brackets. (i) Li, F, N [increasing order of electronegativity]. (ii) Cl, Na, Al [increasing order of Ionization potential]. (iii) Br, F, Cl [Decreasing order of atomic radius]. [3] Answer the following questions with reference to electroplating of silver metal on given object: [4] A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide solution. (i) State one condition required for electroplating. (ii) What are used as anode and cathode electrodes? (iii) Write the reactions taking place at the anode and cathode respectively. (iv) Why is sodium argentocyanide preferred to silver nitrate? ***** 8

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