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BREl's Blue Ridge Public School Secondary Section Name: Std:X Date:25/03/2022 Subject: Chemistry Time: 1hr 30min Max. Marks: 40 Pre-Boards 2021-2022 Ar swer to this paper must be written on the paper provided separately The paper is divided into two Sections Attempt all questions from Section A and any three questions from SectionB. The intended marks for questions or parts of questions are given in brackets [ ]1 SECTION A (10 Marks) Attempt all questions from this section Question 1. Choose the correct answers to the questions from the given options. (Do not copy the question. Write the correct answer only.) i. An alloy of aluminiurn is a . Magnalium b. Bronze c.oider d. Stainless steel ii. In the Ostwald's process, ammonia and air are mixed in the ratio of: a. 1:3 by volume b. 3:1 by volume c . 1:10 by volume d. 10:1 by volume ii. The constituents of Duralium are: a. Al, Mg. Mn Al, Mg AI, Mn d. Al, Mg, Mn, Cu iv. Which of the following will undergo substitution reaction? a. . c. d. Propene Propane Propyne Propanal [101 v. The chain isomer of 1-buteneis a.2-butene b. 2.2 dimethyl propene C. 2 methyl butene d . 2- methyl propene Vvi. Which of the following statement is True for alkenes? a. They are saturated hydrocarbons. b. They have general formula CnH2n-2 C. They are more reactive than alkynes. d. They turn reddish brown bromine solution colourless. Vii. The metal which liberates hydrogen gas when reacted with dil. sulphuric acid is: a. Copper b. Silver V. Magnesium d. Mercury vii. In a homologous series the difference in the molecular weight of two adjacent members is a. 15 b. 12 C 16 d . 14 ix. Hydrated copper sulphate on strong heating produces a a. buff yellow residue b. black residue C.white residue d. residue which is yellow when hot and white when cold x. The second member of homologous series with general formula CnHzn+2 is: va. Ethane b. Ethene C. Ethyne d. Ethanol SECTION B (30 Marks) Altempt any three questions from this section Question2 [21 i. Define: a. Alloy b. Isomers ii. Name the a. (21 following: Ihe ore of D.At anode iron with chemical name triferic tetraoxide Hall Heroult's process. during electrotysis reduction ofalumina by [31 ii. State the relevant reason for the fllowing: for the laboratory a. A special funnel arrangement is used preparation of hydrochloric acid. maintained in the laboratory b. A temperature of around 200 C is preparation of nitric acid. of in the laboratory preparation C. Ammonium nitrate is not used ammonia gas. conversions: iv. Write balanced chen ical equations for the following a. Ethane from ethyne b. Sulphuric acid from nitric acid an alkali. C. Ammonia from ammonium chloride, using Question 3 to concentration of bauxite i. Answer the following questions with respect ore by Baeyer's process a. Why b. Write is caustic alkali used in the above process? heat on aluminium an equation for the action of ii. Name tha gas evolved in each of the following 2] hydroxide. cases: a. A compound in aqueous state which is used to distinguish between dilute hydrochloric acid and dilute nitric acid b. A gaseous impurity which may poison the catalyst in Haber's process. i. Draw structural formula for each of the following: a. 3-methyl pent-2-ene b. 3-chloro butanoic acid 31 c. Propanol iv. Distinguish between the following pairs of compounds using the reagent given in the bracket: a. Copper(l) oxide and Manganese dioxide (using conc. HCI) b. Dilute HNO3 and dil. H2SO4 (using barium chloride solution) c. Ferrous chloride and ferric chloride (using ammonium hydroxide solution) 31 Question4 i. ldentify the anion present in the following compounds. acid liberates Compound X which on reaction with concentrated sulphuric a. colourless gas. The gas forms dense white fume when a glass rod dipped in a ammonia solution is brought near it. b. Compound M which on reaction with dilute sulphuric acid liberates a gas which turns acidified potassium dichromate solution green. ii. Give the IUPAC name for the folowing compounds: H [31 H HH H-C-C-C-C-CI H H OH H H H H-CEC- C-C-H CH3 H C. H H H-C-C0 H ii. a. b. c. State one relevant observation for each of the following: Sodium sulphite is treated with dilute hydrochloric acid. Dry ammonia gas is passed over heated lead (11)oxide. Cane sugar is treated with conc. sulphuric acid. iv.Compiete and balance the foilowing chemical equation: a. C2H4 +H2 b. NH3 +CuO 31 21 Question 5 i. State the formula of the a. Nitre following [21 compounds b.Cryolite S n o w by balanced equation how would vou carry out the conversions A, 5, B NHsNO NO2 C N2 the Write a balanced chemical equation for each of a. Complete combustion of ethane b. Formation of oleum in Contact processS I1. following: [21 iv. Match the following: Compound Property Compound 1. Turns methyl orange a.HCI yellow 2. Heavier than air b.H2SO4 3. Oxidising agent c.NH3 Question 6 i. With reference to the diagram given, answer the following: Dry lICl a Jet tube | Dropper iitmis olulon a. State a property of hydrogen chloride demonstration by this experiment? bottomed flask. b. State the colour of water that has entered the round 21 Write the chemical equations for the reactions at the electrode during the [21 extraction of aluminium by electrolysis. a. At anode b. At cathode questions ii. Answer the following a. Why is a mixture of cryolite and fluorspar added to alumina during Hall Heroult's process? b. Why is an allglass apparatus used in the laboratory preparation of nitric acid? C. State one test for identification of conc. sulphuric acid. iV. 131 Copy and complete the following table: Functional group (a) UPAC Name Trivial Name Methanal Formaldehyde Ethyne (b) (C) Formic acid CHCH H-COOH 3]
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