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ICSE Class X Mid-term 2021 : Chemistry

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BOOSTER EXAMINATION 2020 - 2021 SUBJECT: CHEMISTRY Class: X Time: 2hr Date: 10-12 -20 Marks: 80 ____________________________________________________________________________ Instructions: There are two Sections in this question paper. Section A carries 40marks and all questions are mandatory. Section B carries 40 marks and students have to attempt any four questions. ____________________________________________________________________________ Section A Attempt all questions completely from this section A) Choose the correct alternative from the choices given below for the following statements: [5] a. Which of the following is not a typical property of an ionic compound? (i) Has high melting point (ii) Conduct electricity in the molten state and in aqueous solution (iii) Is insoluble in water (iv) Exists as oppositely charged ions even in solid state EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 1 b. Color of the precipitate formed on adding NH4OH solution to Lead (II) nitrate solution is: (i) Chalky White (ii) Blue (iii) Green (iv) Brown c. Hydrogen chloride gas being highly soluble in the water is dried by: (i) Anhydrous Calcium Chloride (ii) Phosphorus Pentaoxide (iii) Quick Lime (iv) Conc. Sulphuric Acid d. The number of C-H bonds in ethane molecule is: (i) Four (ii) Six (iii) Eight (iv) Ten e. The relative molecular mass of a gas is 44. Therefore, its vapour density is: (i) 44 (ii) 88 (iii) 22 (iv) 11 II. Fill in the blank by using correct word given in the bracket: - [5] a. The next homologue of ethene is ___________ [propene/butene] b. For formation of an electrovalent bond between elements X and Y which are a metal and non-metal respectively, X should have a ___________ [high/low] ionization potential and Y a _________ [high/low] electron affinity. c. On adding ammonium hydroxide to a solution of zinc sulphate, a precipitate is formed which is ________ in excess reagent. [soluble / insoluble] d. For alkynes the general formula is ___________ [CnH2n / CnH2n+2 / CnH2n-2] e. Hot, concentrated nitric acid reacts with sulphur to form ___________ [nitrogen dioxide / Sulphur dioxide / Nitric oxide] EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 2 III. Write a balanced chemical equation for each of the following: a. [4] Action of cold and dilute nitric acid on copper. b. Laboratory preparation of ammonia from ammonium chloride. c. Action of Sodium Hydroxide on Magnesium Chloride d. Dilute hydrochloric acid and Lead nitrate IV. Give reason for the following: - [5] a. Hydrogen Chloride can be termed as a polar covalent compound. b. Dilute HCl cannot be concentrated beyond a certain concentration by boiling. c. Alkanes are said to be saturated organic compounds. d. Sodium hydroxide is considered as strong alkali whereas ammonium hydroxide is a weak alkali. e. MgCl2 is soluble in water but insoluble in acetone, while methane is insoluble in water but soluble in acetone. V. Give one word or a phrase for the following statements: - [5] a. Process of formation of ions from molecules. b. The tendency of an element to form chains of identical atoms. c. Hydrocarbons containing functional groups. d. Which property of Sulphuric acid accounts for its use as a dehydrating agent e. Iron is rendered passive with fuming nitric acid. EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 3 VI. Give the structural formula for the following: a. Butanoic acid d. 2-methyl propane b. Ethanol [5] c. Ethyne e. 2, 2 di-chloropentane VII. Match the pairs: - [6] Sodium Hydroxide solution is added to the solution containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with the coloured precipitate: - List X List Y a. Pb2+ (i) Reddish brown b. Fe2+ (ii) White insoluble in excess c. Zn2+ (iii) Dirty green d. Fe3+ (iv) Chalky white soluble in excess e. Cu2+ (v) Gelatinous white soluble in excess f. Ca2+ (vi) Pale blue EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 4 VIII. State one observation for each of the following: - a. When excess sodium hydroxide is added to calcium nitrate solution. b. Ammonia gas is burnt in an atmosphere of excess oxygen. c. Excess of chlorine gas is reacted with ammonia gas. d. When nitric acid is kept in a reagent bottle for a long time. e. Action of hydrochloric acid on magnesium. [5] Section - B Attempt any four questions completely from the following: Question-1 a. The diagram shows an apparatus for the laboratory preparation of hydrogen chloride [5] EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 5 Answer the following: (i) Identify A and B (ii) Write the equation for the reaction. (iii) How would you check whether or not the gas jar is filled with hydrogen chloride? (iv) What does the method of collection tell you about the density of hydrogen chloride? b. c. Calculate the percentage of nitrogen and oxygen in ammonium nitrate NH NO . [Relative molecular mass of ammonium nitrate is 80, H=1, N=14, O=16] [3] (i) What is the special feature of the apparatus that is used in the laboratory preparation of Nitric Acid? [2] (ii) Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above 200 C? Question-2 a. Using their structural formula, identify the functional group by circling them. (i) Propanoic acid (ii) Pentanal [2] b. A, B, C and D summarize the properties of Sulphuric acid depending on whether it is dilute or concentrated. [3] A = Typical acid property B = Non-volatile acid C = Oxidizing agent D = Dehydrating agent EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 6 Choose the property (A, B, C or D) depending on which is relevant to each of the following: (i) Preparation of hydrogen chloride gas (ii) Preparation of copper sulphate from copper oxide (iii) Action of conc. Sulphuric acid on sulphur. c. A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula. [C = 12, H=1] [3] d. State your observation when ammonium hydroxide solution is added drop by drop and then in excess to each of the following solution: [2] (i) Copper Sulphate solution (ii) Zinc Sulphate solution Question-3 a. Define the term isomerism. Draw the possible chain isomers of pentane. [3] b. Mention three characteristics of homologous series. [3] c. Find the empirical formula of the compounds with the following percentage compositions. Mg = 9.76%, S = 13.01%, O = 26.01%, H2O = 51.22% [R.A.M : Mg=24, S=32, O=16, H=1 ] EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY [4] 7 Question-4 a. Complete the following equation: - [3] (i) S + conc. HNO3 (ii) C + conc. H2SO4 (iii) Mg + conc. HNO3 b. Name the following organic compounds: - [3] (i) The compound with 3 carbon atoms functional group is a carboxyl. (ii) The first homologue whose general formula is CnH2n. (iii) CH3 -CH2 -CH2 -CH3 (c) A compound has the following percentage composition: [4] Na = 18.60 %, S = 25.80%, H = 4.03% and O = 51.58%. Calculate the molecular formula of the crystalline salt assuming that all the hydrogen in the compound is in combination with the oxygen as water of crystallization. Molecular weight of the compound is 248. [Na = 23, S = 32, H = 1, O = 16] Question-5 a. Draw the electron dot structure of: - [3] (i) Nitrogen molecule [N=7] (ii) Sodium Chloride [Na = 11, Cl = 17] (iii) Ammonium ion [N = 7, H = 1] EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 8 b. Draw the structures of the following organic compounds: - [3] (i) 2,2, Dimethylpropane (ii) 2-methyl hexanal (iii) 3-chloro, 2-methyl butane c. The molecules of the alkene family are represented by a general formula CnH2n. Now answer the following: [4] (i) What do n and 2n signify? (ii) What is the lowest value which can be assigned to n? (iii) What is the molecular formula and name of the alkene when n=4? (iv)What is the molecular formula for the alkene if there are 6H atoms in it? EISB/BOOSTER EXAMINATION/DECEMBER-20/GRADE 10/CHEMISTRY 9

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