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FOoUNDATION'S) MUMBAI MERCHANTS EDUCATIONAL (NAVI ANCHORWALA EDUCATION ACADEMY FIRST PRELIMINARY ASSESSMENT 2023-2024 MARKS: 80 TIME: 2 Hours GRADE: 10 SUBJECT: CHEMISTRY NAME OF THE STUDENT: DATE:08.12.2023 Answers to this paper must be written on the paper provided separately. the first 15 minutes. You will not be allowed to write during This time is to be spent in reading the question paper. writing the answers. time allowed for The time given at the head of this paper is the four questions from Section ll. Atempt all questions from Section I and any questions are given in brackets [] The intended marks for questions or parts of SECTION I(40 Marks) (Attempt allquestions from this section) Question 1 below: a. Choose the correct answer from the options given calcium sulphite: (i) The gas evolved when dil sulphuric acid reacts with a. Hydrogensulphide. b. Carbon dioxide C. Sulphur dioxide. d. Nitrogen dioxide. [15] ( ))Which of the folowing willnot affect the brown colour of bromine solution in carbon tetrachloride? a. CsHo b. C,H2 c.CzH,* d. CaHs nitric (ii) Which of the following substances reacts with cold and dil nitric acid to evolve Oxide? a. Carbon b. Sulphur c. Sodium carbonate d. Copper. (iv) Sodium chloride is preferred for the preparation of HCl over other metal chlorides because: aSodium chloride is crystaline c. It is cheap. b. It is amorphous d. It is an ionic compound 1 (v) ldentify one statement that does a not hold true for Electrolyte is acidified CuSO, solution b.Cathode is a thin strip of impure c. Anode gets d. Anode electrorefining of copper : copper thinner dissolves in the electrolyte (Vi) Which of the statements is not correct about the trends when left to right acrossfollowing the periods of the periodic going trom table? a The b. The elements become less metallic in number of valence electrons C. The nature increases atoms lose their electrons more easily d, The oxides become more acidic (vi)The process by which a. Leaching sulphide ore is concentrated : b. Hydraulic washing c.Magnetic separation d. Froth floatation. vii) Assertion (A): Electron affinity is maximum in halogens. Reason (R):The of addition shell. an electron to the atom results in the a. (A) is true and (R) is not completely filled correct explanation of (A) b. (A)is true and (R) (A) correctly. explains C. (A) is false but (R) is a correct d. Both (A) and (R) are statement. incorrect statements. (ix) What is the product of the given reaction P,0, + H,0 a.H,PO, (x) The b. H,PO, C. HPO, d. H,PO, . reagent which forms deep blue solution with copper a. Sodium hydroxide C. Ammonium hydroxide. d. Zinc hydroxide molecular formula b. CzH2 sulphate: b. Potassium hydroxide <(xiy The hydrocarbon contains 17.2% of H. If the a.CzH, : cCaHo vapour density is 29. , calculate its d. CHa 2 (Xi) The atomicweight of chlorine is 35.5. What is its vapour density? a. 35.5 b.71 C. 142 d. None of these (Kimn) Ahydrocarbon having the general formula C,Han:2 reacts with halogens. The reaction is known as: a. Substitution b. Addition d. Hydrohalogenation (Xiv) Which of the following shows the Oxidizing nature of sulphuric acid: c. Polymerization a. S + 2H,SO, 3S0, + 2H,0" b. NaCl + H,SO, NaHSO, + HCI c. CuO+ H,SO, CuSO, + H,0 d. Na,CO, +H,S0, Na,SO, +H,0 +CO, (xv)The mass of 7 litres of CO, at S.T.P is : a. 13.75 b. 15.75 C. 12.75 d. 10.75 Question 2 Ethene.Answer the a. The diagram shows an apparatus for the laboratory preparation of [5] questions that follow: B C NUH sdutue i. ldentifyA and B ii. Write the equation for the reaction. ii, Mention the purpose of NaOH solution. iv. Mention the method of collection of gas, explain the reason. v. What is the common name of the gas'C ,Mention its importance for plants. b.Write equations for the following reactions: i. Silver nitrate is heated strongly i.Cane sugar is dehydrated using Conc sulphuric acid. i, Propane is heated in sufficient supply of air 0v. Ammonia is reactingwith excess chlorine. v. Decomposition of sulphides by acids. c. Name the following: [5] i. The chemical tests for the identification of unknown substances in a given sample. ii. An alloy used in electrical wiring. ii. The technique for dissolving hydrogen chloride gas in water. iv, The chemical name for the brown ring. V. Weak inorganic acid d. A)Draw the structural formula for the following : [5] i. 2-ethyl pentan1-ol. ii, 2-methyl 2-butene. ii. 2,3 -dichloro hex 2-ene. B)Write the IUPACnomenclature for the following compounds OH HyC=CH-CH-CH2 CH3 0V. H,C-CH-CH- H-CH CHg HC e. Match the following: [5] Column -| Column -|| i. Reduced by heating. a. K,Cr,0, i. Reduced by heating with carbon b. Al,0, ii,. Reduced by electrolysis c. BaSO, iv. Insoluble sulphate d. HgO v. Oxidising agent e. ZnO 4 Question 3 SECTION I(40 Marks) (Attempt any four questions from this section) d. Complete and balance the following equations, State the conditions wherever necessary. (4) i. C,H, + Br, ii. CaC, + H,0 ii, CH,COONa + NaOH iv. C,H, +HCI a white 0. A given greenish coloured solution 'A' on reaction with bariumchloride gives 'A' solution coloured precipitate that insoluble in the mineral acids and another part of (21 on treating with ammonium hydroxide gives dirty green precipitate. ldentifty: i. Anion ii. Cation in the given solution A to contain C. An organic liquid having carbon, hydrogen, nitrogen and oxygen was found molecular the Calculate oxygen. C= 41.37%, H = 5.75%, N = 16.09% and the rest formula of the liquid if the vapour density is 43.5. [H=1, 0 =16,C= 12, N=14]14) Question 4 a. Write the balanced equation for the following: (3] i. Copper sulphate from copper carbonate ii. Sulphuric acid from acidic oxide ii. Basic oxide by decomposition of metal nitrate. b. Copper sulphate solution is electrolyzed using copper electrodes: Copper cathode Copper anode copper(ll) sulfate solution 5 [3] Whichelectrode is known as the oxidizing electrode and why? VVrife the equations taking place at both the electrodes. Slate two appropiate observatlons lor the above electrolysis reactionS c. During the extraction of aluminium: i. Write the composition of the eleclrolyte. 14) I. Why is SO much graphite required for the electrolytic process? ii. Write the equation to show the dissociation of cryolite. 0v. Mention two reasons whypowdered coke is sprinkled. Question 5 a. In the preparation of ammonia: (3] Gas collected Mixture Drying 2gent Heat i.Which reactant is taken in a higher ratio and why? Name the ammonium salt that cannot be used for the above reason. reaction. Explain the ii. ii, Give the balanced b. Answer the following : equation of the above reaction. i. (3] Ethene is insoluble in water but in soluble ii. Write the reason. equation between acetic acid andalcohol.Give ethyl alcohol.Name the ii. Explain the reaction. reaction between acetic acid and calcium C. Calculate hydroxide. i. Write the i. The vapour densities of first two empirical mass of benzene. members of the alkanes series. (2] d. i. A student added calcium nitrate and zinc ammonium hydroxide solution to each of the salt solutions solution gives an insoluble Explain the observation innitrate.Which precipitate. excess of ammonium hydroxide. (2] 6 of Question 6 14) a.Write the balanced equations : Iron () chloride Sodium Chloride A C Hydrogen Ammonium chloride chloride D Lead chloride exhibited in each of the following 0.Mentionthe property of conc H,SO, reactions (3) with: i. sugar ii. Metals ii. Sodium chloride. the balanced equation: c. Name the process and write obtained from ethene. i. Process by which ethane is compound is formed. bigger molecule of the same a which by Process 0. ii. Process by which hydrogen [3] alkanes. isadded to the alkynes togive Question 7 is burnt for every 500cc of a. What volume of propane under O,. used in the reactions (2) the same conditions. following: b. Differentiate between the sulphate ( with an alkali) i. Ammonium sulphate and sodium sulphate ii. Sodium carbonate and sodium (with dil HCI). following: acid, write the equation for the c. In the preparation of Sulphuric conditions ). i. Oxidation of sulphur dioxide (Mention the d. desired compound. i. Absorption of sulphur trioxide to form the in the bracket. Arrange the following as per the instruction given i. Na, K, CI, Si, S (Increasing order of electronegativity ) i. Be, Li, F.C, B, N, O (Increasing order of metalic character) 7 [4] (2] Question 8 aAnswer the followingquestions (3) i. The bottle of liquor ammonia should be opened very carefully.Give reason for the above statement. i. Write the equation to show the reducing property of ammonia withmetallic oxide. i.Ammonia dissolved in water is useful for qualitative analysis. Explain. b. Name allthe type of bonds present in the following compounds: (3] i. Calcium carbonate i. Sulphuric acid i. Ammonium hydroxide cA gas cylinder contains 24 x10 24 molecules of nitrogen gas. If avogadro's number is 6x 1023 and relative mass of nitrogen is 14 calculate: i. Mass of nitrogen as in the cyllinder. i. Volume of nitrogen gas 8 [4]
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