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HIRANANDANI FOUNDATION SCHOOL SECOND PRELIMINARY EXAMINATION JANUARY,2023 CHEMISTRY STDX READING TIME: 15 min WRITING TIME: 2Hrs Marks: 80 17 / 01123 ----------------------- oate: ----------- ns must be written on the paper provided separately. A wer to this Paper You will be not allowed to write during thefirst 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 answer. Th is questio n paper is divided into two sections... Section A is compulsory. Attempt any 4 questionsfrom Section B. . Th e intended marks for questio are given in brackets [J SECTION A (40 Marks) (Attempt all questions from this section} QUESTION 1: Choose one correct answer to the questions from the given options: (i) [15] Addition reaction is the characteristic property ofAldehydes (A) Alkanes (B) Alkynes (C) Alcohols (D) Visit https://testpaperz.com for Question Papers (ii) The constituents present in the ore duralumin areAl, Mn (A) Al, Mg (B) Al, Cu, Mg, Mn (C) Al, Cu ,Zn, Mn (D) This paper consists of 11 printed pages Hfs, Powai 2nc1 Prelim, Jan 2023 std 10, chem (iii) The basicity ofH3PQ3 is4 (A) 2 (B) 3 (C) 1 (D) (iv) For the same concentration of ions in the solution containing Mg2+, eu2+ , Al3+, Zn2+ Which of the following will be discharged at the cathode Zn2+ (A) (B) Al3+ + (C) Cu2 Mg2+ (D) (v) When a metal becomes an ion , the It gains electrons & is reduced (A) It loses electrons & is reduced (B) It loses electrons & is oxidised (C) It gains electrons & is oxidised (D) (vi) Hot cone Nitric acid oxidises sulphur to Nitrogen dioxide (A) Sulphur dioxide (B) Visit https://testpaperz.com for Question Papers Sulphuric acid (C) Sulphurous acid (D) (vii) If an element has a low ionization energy then it is likely to be (A) Non-metallic (B) Metallic (C) Electronegative (D) Both A and C Hfs, Powai 2nd Prelim, Jan 2023 ' std 10, chem I (viii) The products obtained when zinc reacts with excess caustic soda solutionZinc hydroxide & Water (A) Zinc oxide & Water (B) Zinc hydroxide & Hydrogen (C) Sodium zincate & Water (D) (ix) An organic weak acidFormic acid (A) Nitric acid (B) Phosphoric acid (C) Sulphuric acid (D) (x) The most non metallic element in the periodic tableNitrogen (A) Chlorine (B) Fluorine (C) Visit https://testpaperz.com for Question Papers Oxygen (D) (xi) The number of C-H bonds present in penta ne molecule areJl (A) 10 (B) 16 (C ) 12 (D) Hfs, Powai 2 nd Prelim, Jan 2023 std 10, chem (xii) The chemical fonnula of bauxite ore is Ah03 (A) Ah03.2H20 (B) Ah 03. l/2H20 (C) Ah03.H20 (D) (xiii) A compound is formed by 24 grams of 'A' and 64 gms oxygen, If at masses of A=l2 and 0=16, then the empmcal . formula of the compound will be (A ) A02 (B) OA2 (C) AO (D) A204 (xiv) The aim of the fountain experiment is to prove that HCl is heavier than air (A) (B ) HCl is lighter than air HCl is a polar covalent compound (C) HCl is highly soluble in water. (D) Visit https://testpaperz.com for Question Papers (xv) Catalytic oxidation of ammonia gives the following productNitric oxide and water (A) Nitric oxide and Hydrogen (B ) Nitrogen dioxide and Hydrogen (C) Nitrous oxide and water (D) Hfs, Powai 2 nc1 Prelim, Jan 2023 std 10, chem Question 2: The figure gi en elow depicts : ammonia gas passed through red hot opp e [II] ox.id Ill a ha rd glass tube. With reference to this, answer the ll OWIIlg questio ns 10 [4] DRY A 1MONIA L. ,,._.__.__...,<.= - = HEAT WATER COLD WATER Visit https://testpaperz.com for Question Papers (a) Give balanced chemical equation for the above experiment. (b) State the pr operty of ammonia exhibited. (c) State your observation when copper[II] oxide is replaced by Lead[II] oxide in the above figure. (d) State your observation when Cu[II]O is dissolved in dil sulphuric and the solution is treated with excess ammonia solution . std 10, chem 2nd Prelim, Jan 2023 Hfs, Powai (ii) Match the following Column A with Column B. Column A Indicator [4] ColumnB Colour in acidic medium Remains colourless Pink to colourless Blue turns red (iii) Fill in the blanks (5) (a) The formula of chief ore of iron is ---(b) The hydrocarbon which cont_ributes towards green house effect lS (c) (d) (e) --- The chemical name for sal ammoniac is ____ and ___ nitrates do not liberate nitrogen dioxide on heating. The ___ indicator is a mixture of indicator dyes that gives a spectrum of colours depending on how acidic or alkaline a Visit https://testpaperz.com for Question Papers solution is. (iv) Draw the electron dot structures of the following (a) (b) (c) [4] Carbon tetrachloride Water Formation ofHydronium ion Hfs, Powai 2nd Prelim, Jan 2023 std 10, chem (v) Identify the following(a) The element having highest ionization potenti . al m the modem dic tabl e. peno [3] (b) The gas produced when excess ammonia rea cts with chlorine . (c) The gas evolved which turns acidified ferrous sulphate solution brown, wh en copper metal is dropped in con nitric acid . (vi) Draw the structural formula for the foll owing[5] (a) Dime yl acetylene (b ) Ethyl chloride 2,2-dimethyl pentanoic acid (c ) Isopropyl alcohol (d) 3,3-dichloro butanal (e ) SECTIONB ( Attempt anyfour questions) Question3: Visit https://testpaperz.com for Question Papers Identify the cation present in the following(i) [3] (a) To salt 'X' calcium hydroxide solution is added and on heating it liberates a pungent smelling gas which turns moist red litmus paper blue. (b) Compound, 'Y' on treating with ammonia solution gives a reddish brown ppt , insoluble in excess ofthe reagent. (c) Compound 'Z' on treating with caustic soda solution gives a gelatinous white ppt soluble in excess ofthe reagent. Give balanced chemical equations for the followfng- [3] (ii) (a) Complete oxidation ofmeth ne. (b) Metal aluminium reacts with boiling caustic soda solution. 2nd Prelim, Jan 2023 Hfs, Powai std 10, chem Dilute Hydrochloric acid is added to calcium bicarbonate solution. (c) [3] (iii) Name the following(a) The method used to prepare Hydrochloric acid from Hydrogen chloride (b) The first member of olefinic series (c) The IUPAC name of the hydrocarbon which has its common name as formaldehyde. (iv) Compare the vapour density of Hydrogen chloride gas with air. [1] Question 4: (i) Visit https://testpaperz.com for Question Papers A white crystalline soluble substance 'P' on heating produces a reddish-brown gas 'Q' and a gas which rekindles a glowing splinter. It gives a buff yellow residue 'R'. When caustic soda solution is added to substance 'P', it gives a chalky white ppt. Identify the substance 'P', residue 'R' and write the formula of the precipitate formed. [3] (ii) With reference to Bayer's process give balanced chemical equations for the conversion of impure bauxite to pure alumina. [3] (iii) State which of the two - a solution of HCl in water & a solution of HCl in toluene is an electrolyte. Justify your statement. [2] (iv) Calculate the percentage of carbon in a 55% pure sample of calcium carbonate. [2] [Ca'- 40, C=l2, 0==16] Hfs, Powai 2nd Prelim, Jan 2023 std 10, chem Question 5: / (i) (a) (b) ( c) (ii) (a) (b) ( c) Name the catalyst used in the following industrial process: [3] Hab er's process Contact process Ostwald's process Classify the following as non electrolyte, weak electrolyte and Strong electrolyte [3 J MoltenKCI Methane Acetic acid State your observation for the following[4] Bromine vapours are passed into a solution of (a) ethyne in carbon tetrachloride. Zinc nitrate crystals are heated in a hard glass (b) test tube. Ammonia bums in oxygen (c) Magnesium is dropped in dilute sulphuric acid. ( d) (iii) Visit https://testpaperz.com for Question Papers Question 6: A compound weighing 1.30 g on analysis gave the following composition,Al= 0.2675 g ; P= 0.3505 g ; O= 0.682 g. If th molecular weight of the compound is 122 . Calculate the molecular formula of the compound. Al 27,P=31,0=16 [ ] 4 2 nd Prelim, Jan 2023 Hfs, powai (ii) (a) (b) (c) (iii) std 10, chem Follow the mstruction given in the bracket for each and write the reaction [3] Aqueous copper sulphate using platinum electrodes[ anode reaction] Electr olytic diss ociation of alumina. Molten lead bromide. [cathode reaction] With reference to first three periods of the modem periodic table , answer the following questions[3] (a) State the common property of the elements present along with fluorine in the same group. (b) Two elements X and Y belonging to the same period, what would be common in the m. ( c) A metal M for ms an oxide having the formula M2O3 . It belongs to the third period. Write the atomic number and valency of the metal. Question 7: (i) Solution 'X' is a strong acid, solution 'Y' is a weak acid, Solute 'Z' is a strong alkali. [3) (a)Which of the above solutions will give a white ppt with calcium nitrate solution. Visit https://testpaperz.com for Question Papers (b) Which of it would be a solution of acetic acid. (c) Which of it would be a solution of dilute sulphuri.c acid (ii) With respect to Contact process give the following reactions, (a)Absorption of sulphur trioxide in sulphuric acid. (b) Dilution of oleum ,_ [2] Hfs, Powai 2nd Prelim, Jan 2023 std 10, chem . . (iii) 1500 ml of a gas at s T p weigh s 1.50 g .Calculate the vapour . d ens1ty and molecular weight of the gas . [1 lit of H2 at S.T.P weighs 0.09 g] [3] (iv) Writ the chemical formula of the two substan ces used in electrolytic reduction of pure alumina which lowers t e temperature of h the electrolyte and increases the conductivity of the sol ution. [2] Que stion 8: Give a chemical test to distinguish between the following [4] compounds(a) Sodium hydroxide and ammonium hydroxide solution (b) Sodium nitrate and sodium sulphate solution (c) Hydrogen sulphide and sulphur dioxide gas (d) Ethane and Ethene Give balanced chemical equations for the following (ii) organic preparation[3] Methane from sodium acetate. (a) Acetylene from calcium carbide. (b) Ethene from ethylbromide (c) [3] Give the terms defined in each of the following(iii) (a) The salts formed by the complete replacement of the ionisable hydrogen atoms of an acid by a metallic or an ammonium ion. which metals can be (b) Naturally occurring materials from extracted. s of an element through (c) Toe property of self- linking of atom covalent bonds in order to form straight chains, branched chains and cyclic chains of different size. (i) -----------x----------- Visit https://testpaperz.com for Question Papers
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