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CHEMISTRY SCIENCE Paper -2 ( Two Hours ) Answer 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 answer. Attempt all questions from Section I and any four questions from section II. The intended marks for questions or parts of questions are given in brackets. [ ] SECTION I (40 Marks) (Attempt all questions from this section) Question 1 (a) From the list given below. Select the word(s) required to correctly complete blanks (I) to (v) in the following passage. The words from the list are to be used only once. [Ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water] [5] A solution X turns red litmus blue so it must contain (i) Ions another solution Y turns blue litmus red and hence must contain (ii) ions . When solution X and Y Mixed together the products will be (iii) and (iv) if a piece of magnesium was put Into a solution Y (v) gas would be evolved (b) Name the gas in each of the following (i) The gas produced on reaction of sodium bicarbonate with dil sulphuric acid (ii) The gas produced on reaction of copper sulphide with dil hydrochloric acid (iii) The gas produced when copper reacts with concentrated nitric acid 1 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III [5] (iv) The gas produced when copper reacts with concentrated sulphuric acid. (v) The gas produced when zinc react with dil sulphuric acid (c) Choose the correct answer from the option given below. (i) An element with atomic number 19 will most likely combine chemically with the element whose atomic number is (ii) (iii) (a) 17 (b) 11 (c) 18 (d) 20 The two main metals in bronze are: (a) Copper and zinc (b) Copper and Lead (c) Copper and nickel (d) Copper and tin The ratio of number of moles in 2g of Hydrogen and 32g of Oxygen is (a) 1:2 (b) 1:16 (c) 1:1 (d) 0.01:1 (iv) The particles present in strong electrolyte are: (a) Only molecule (b) Mainly ions (c) Irons and molecules (d) Only atoms (V) The aim of fountain experiment is prove that (a) Ammonia turns blue litmus red (b) Ammonia is denser then air (c) Ammonia is highly soluble in water (d) Ammonia fumes in moist air. (d) Consider the following reaction: (5) (NH 4 ) 2 Cr 2 O 7----- N 2 (g) +4H 2 O (g) +Cr 2 O 3 2 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III [5] If 63g of (NH ) Cr O 4 2 2 7 is heated calculate: i) The quantity in moles of (NH ) Cr O ii) The quantity in moles of nitrogen formed. iii) The volume in litre of nitrogen evolved at S.T.P 4 2 iv) 2 7. The mass in grams of Cr 2 O 3 formed at same time (Atomic mass: H=1, Cr=52, N=14) (e) State the observation in each of the following cases (5) (i) When excess sodium hydroxide is added to calcium nitrate solution (ii) Ammonium hydroxide solution is added to copper (ii) nitrate solution in small quantity then in excess. (iii) Ammonium hydroxide solution is added to Zinc nitrate solution in minimum quantity then in excess. (iv) sodium hydroxide solution is added to ferric chloride solution at first a liitle and then in excess. (v) Excess ammonium hydroxide solution is added to lead nitrate solution. (f) From the list choose the salt that most appropriately fits the description given in following (AgCl, MgCl 2, NaHSO 4 ,PbCO 3 , ZnCO 3 ,KNO 3 , Ca(NO 3 ) 2 ) i) A deliquescent salt ii) An insoluble chloride iii) On heating this gives a yellow residue when hot and white when cold iv) On heating this salt a brown colored gas evolved. g) Write the IUPAC name of following: (6) I) CH3-CH(CH3)-CH(CH3)-CH3 II) CH3-CH2-CH2-CHO III) CH2=CH-CH2-CH=CH2 IV) CH3-CH2-CH=CH-CH3 V) CH3-CH2-CHOH-CH3 VI) CH3-C(CH3)(OH)-CH3 3 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III h) Mr Aniket wants electroplate his keychain with Nickel to prevent rusting. For this electroplating (5) i) Name the electrolyte ii) Name the anode iii) Name the cathode iv)Give reaction at cathode v)Give reaction at anode Question 2 (A) A group of elements in the periodic table is given below: Boron is the first member and Thallium is the last member of the group .[Boron,Aluminium,Gallium,Indium,Thallium] Answer the following questions i) Which element has the most metallic character. ii) Which element would have highest negativity. ssiii) If electronic configuration of Aluminium is 2,8,3. How many electrons are there in outer shell of Thallium? iv) The atomic number of Boron is 5. Write chemical formula of compound formed when Boron reacts with Cholorine. v) (B) Will the element in group to left of this boron group be more metallic or less metallic in character [5] An element Z has atomic number 15. Answer the following [4] (i) State the period and group to which Z belongs (ii) Is Z a metal or a non-metal? (iii) Stale the formula between Z and hydrogen (iv) What type of compound (iii) formed (C) Define electronegativity Question 3 4 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III [1] (A) Choose the most appropriate answer from the following : Each answer used only once (i) A basic oxide (ii) An oxide which dissolve in water forming and acid (iii) An amphoteric oxide [4] (iv) A covalent oxide of a metalloid (B) (C) Define the following with example (i) Efflorescence (ii) Deliquescence [4] How will you convert the following to their respective chloride, give equations only (i) Sodium oxide (ii) Copper oxide [2] Question 4 (A) The electrical conductivity of acetic acid is less in comparison to electrical conductivity of dil sulphuric acid at same concentration give reason (B) (C) Draw the structure of stable positive Ion formed when an acid dissolved in water [2] Give balanced chemical equations [4] (i) Zinc reacts with dil hydrochloric acid (ii) Zinc reacts with potassium hydroxide and heated (iii) Zinc oxide heated with potassium hydroxide (iv) (D) [2] Zinc oxide reacts with dil hydrochloric acid What is the volume of 7.0 gram of chlorine at S.T.P.? [2] Question 5 (A) A cylinder contains 85g ammonia gas at S.T.P. 5 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III [3] (i) What is the volume occupied by the gas. (ii) How many moles of ammonia are present in cylinder? (iii) How many molecules of ammonia are there in cylinder [N=14, H=1] (B) Copy and complete the following table (C) Some properties of sulphuric acid are listed below choose the role [2] played by sulphuric acid as a, b, c or d which is responsible for the reactions (I) to (v) some roles may be repeated. (a) Dilute acid (b) Dehydrating agent (c) Non-volatile acid (d) Oxidizing agent [5] (i) (ii) (iii) (iv) (v) Question 6 (A) (B) Differentiate between electrical conductivity of copper sulphate solution and copper metal [2] Answer the following question: [5] (i) Name the metal which is found abundantly in earth s crust. (ii) What is the difference between calcination and roasting? (iii) Name the process used for enrichment of sulphide ore (iv) Write formula of main one of aluminium 6 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III (v) (C) Write the constituents of electrolyte for the extraction of aluminium. Draw the chain isomer of C4H10 and write their IUPAC name [2] Name the following. [3] Question 7 (A) (B) (C) (i) A drying agent which is used to dry HCL. (ii) The gas obtained by treating sodium chloride with conc sulphuric acid. (iii) The chemical which dissolve gold. Draw the structure for the following (i) 3 Methyl pentane (ii) 2, 3 dichloro butane (iii) Ethanoic acid [3] Give balance reaction for the following: (i) [2] When sodium acetate reacts with sodium hydroxide in the presence of calcium oxide. (ii) When ethanol reacts with conc sulphuric acid at 170 (D) 0 C What is esterification write a balanced chemical equation to explain it. 7 ICSE (Grade : X) | CHEMISTRY (SCIENCE Paper-II) | Pre Board Exam-III [2]
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