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ICSE Board Exam 2016 : Chemistry

9 pages, 91 questions, 91 questions with responses, 693 total responses,    0    0
Srujan Deshpande
Sri Chaitanya Techno School, Bangalore
XI-XII PCM, IP, English
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CHEMISTRY SCIENCE Paper - 2 (Two hours) Answers 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 Section I allowedfor writing the answers. is compulsory. Attempt any four questions from Section IL The intended morksfor questions or Wrts of questions are given in brackets I J SECTION I (40 Marks) Attempt oll questions from this Section Question (a) 1 Fill in the blanks with the choices given in brackets. because they are (ii) electron Electrovalent compounds tsl (acceplors/ donors). have (high I low) melting points. (iii) Higher the pH value of a solution, the more (acidic / alkaline) it is. (iv) (AgCl / PbCl), a white precipitate is soluble in excess NH+OH. (v) Conversion of ethene to ethane is an example of (hydration / hydro genation). This Paper consists of 9 printed pages and T16 @ Copyright Reserved. 522 I blank page. Turn Over (b) Choose the comect answer from the options given below: (i) An element with the atomic number 19 will t5l most likely combine chemically with the element whose atomic number is: A. t7 B. lt c. D. (ii) l8 20 The ratio between the number of molecules in 29 of hydrogen and 32g oxygen is: A. l:2 B. I :0.01 C. l:l D. 0.01:l [Given that H=1, O:16] (iii) The two main metals in Bronze are: A. Copper and zinc B. Copper and lead C. Copper and nickel D. Copper and tin (iv) The particles present in strong elecrrolytes are: A. only molecules B. mainly ions C. ions and molecules D. (v) only atoms. The aim of the Fountain Experimenl is to prove that: A. HClturns blue litmus red B. HCI is denser than air C. HCI is highly soluble in water D. HCI fumes in moist air. T16 522 of (c) Write balanced chemical equotions for each of the following: (i) t5l Action of warm water on AlN. (ii) Action of hot and concentrated Nitric acid on copper. (iii) Action of Hydrochloric acid on sodium bicarbonate (iv) Action of dilute Sulphuric acid on Sodium Sulphite. (v) (d) Preparation of ethanol from EthylChloride. State (i) your observations when: t5] Dilute Hydrochloric acid is added to Lead nitrate solution and the mixture is heated. (ii) Barium chloride solution is mixed with Sodium Sulphate Solution. (iii) Concentrated Sulphuric acid is added to Sugar Crystals. (iv) Dilute Hydrochloric acid is added to Copper (v) (e) Dilute Hydrochloric acid is added to Sodium thiosulphate. Identify the term/substance in each of the (i) carbonate. following: t5l The tendency of an atom to attract electrons to itself when combined in a compound: (ii) The method used to separate ore from gangue by preferential wetting. (iii) The catalyst used in the conversion of ethyne to ethane. (iv) The type of reactions alkenes undergo. (v) (f) The electrons present in the outermost shell of an atom. (i) A gas of mass 32gms has a volume of 20 litres at S.T.P. Calculate the t5l gram molecular weight of the gas. (ii) How much Calcium oxide is formed when 82g of calcium nitrate is heated? Also find the volume of nitrogendioxide evolved: t (Ca:40, N: 2Ca(NOr)z Tt6 522 ZCaO + 4NOz + Oz 14, O: 16) Turn Over (g) Match the salts given in Column I with their method of preparation givenin t5l Column Il: Column I (i) Pb(NOr)z from PbO A) (ii) MgCl2 from Mg B) Titration (iii) FeCl: from Fe C) Neutralization (iv) NaNO: from NaOH D) Precipitation (v) (h) Column II E) Combination (i) Z,nCOt from ZnSO+ Simple displacement Write the IUPAC names of each of the following: tsl H HTI llt I. H-C_C-C_H I H HH tl 2. H*C_C = C-C_H tt HH HH tt 3. H-C-C=O I H (ii) Rewrite the following sentences by using the correct symbol > (greiler than) or < (less than) in the blanks given: I . 2. T16 522 The ionization poterrtial of Potassium is The electronegativity of lodine is that of Sodium. that of Chlorine. - II SECTION (40 Marks) Attempt any four questions from this Section Question 2 (a) Use the letters only written in the Periodic Table given below to answer the t41 questions that follow: I ll VMI III M GROUPS 0 t a a o3 i-r 4 5 (i) State the number (ii) Which element shown forms iozs with a single negative charge? of volence electrons in atom J. (iii) Which metallic element is more reactive than R? (iv) Which element has its electrons arranged infour shells? (b) l2l Fill in the blanks by selecting the correct word from the brackets: (i) If an element has a low ionization enelgy then it is likely to be (metallic / non metallic). (ii) If an element in its outermost shell then it is likely to has seven electrons (largest have the / smallest) atomic size among all the elements in the same Period. (c) The following table shows the electronic configuration of the elements W, X, Y, Z: Element w X Y Electronic configurations 2,8,1 2,8,7 )\ Z Answer the following questions based on the table above: (i) l. (ii) WandX 2. Y andZ What is the formula of the compound formed between 1. T16 522 tzl What type of Bond is formed between: XandZ 2. : t2) WandX Turn Over Question 3 (a) Write a balanced chemicol equation for each of the (i) t3l Burning of ethane in plentiful supply of air. (ii) following: Action of water on Calcium carbide. (iii) Heating of Ethanol at l70oC in the presence of conc. Sulphuric acid. (b) Give the structural formulae of each of the (i) (c) Ethanoic acid (iii) Butan t3l 2-methyl propane (ii) following -2-ol Equation for the reaction when compound A is bubbled through bromine 12) dissolved in carbon tetrochloride is as follows: A- Br2/CCla CHzBr | CHzBr (i) (ii) (d) Draw the structure of A. State your observation during this reaction. Fill in the blanks using the appropriate words given below: 12) (Sulphur dioxide, Nitrogen dioxide, Nitric oxide, Sulphuric acid) (i) Cold, dilute nitric acid reacts with copper to give (ii) Hot, concentrated nitric acid reacts with sulphur to form Question 4 (a) Identify the gas evolved and give the chemical test in each of the CASES: (i) (ii) Tt6 Dilute hydrochloric acid reacts with sodium sulphite. Dilute hydrochloric acid reacts with iron (ll) sulphide. 522 following t2) (b) State your observations when ommonium hydroxide solution is added drop drop and then in 12) to each of the following solutions: excess (i) copper sulphate solution (ii) (c) by zinc sulphate solution. Write equations for the reoctions toking place at the two electrodes t4l (mentioning clearly the name of the electrode) during the electrolysis of: (i) Acidified copper sulphate solution with copper electrodes. (ii) Molten lead bromide with inert electrodes. (d) (i) Name the product formed atthe onode during the electrolysis of acidified Lzl lvater using platinum electrodes. (ii) Name the metallic ions that should be present in the electrolye when an article made of copper is to be electroplated with silver. Question 5 (a) A gas cylinder contains 12 x l02a molecules of oxygen gas. l2l If Avogadro's number is 6x1023; Calculate: (i) (ii) (b) the mass of oxygen present in.the cylinder. the volume of oxygen at S.T.P. present in the cylinder. [O=16] A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour t3] density is 29, find its molecularformula. [C:12, H=l] (c) The equation 4Ntll +5Oz oxidation of ammonia. If .-----) 4NO + 6HzO, represents the catalytic 100 cm3 of ammonia is used calculate the volume [3] af orygen required to oxidise the ammonia completely. (d) By drawing an electron dot diagram show the formation of Ammonium [Atomic No.: N :7 and H lon 121 : l] Question 6 (a) Name the gas evolved when the following mixtures are heated: (i) Calcium hydroxide and Ammonium Chloride (ii) t21 Sodium Nitrite and Ammonium Chloride Tt6 s22 Turn Over (b) Write balanced chemical equotions for each of the following: (i) . When excess of ammonia is treated with chlorine. (ii) 12) An equation to illustrate the reducing nature of ammonia. (c) A, B, C and D summarize the properties of sulphuric acid depending on t3l whether it is dilute or concentrated. A: Typical acid property B = Non volatile acid C : D: Oxidizing agent Dehydrating agent 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. (d) Give reosons (i) why: t3l Sodium Chloride will conduct electiicity only in fused or aqueous solution state. (ii) tn the electroplating of an article with silver, the electrolyte sodium argentGcyanide solution is preferred over silver nitrate solution. (iii) Although copper is a good conductor of electricity, it is a non-electrolyte. Question 7 (a) (i) Name the solution used to react with Bauxite as a first step in obtaining pure aluminum oxide, in the Baeyer's process. (ii) Write the equation for the reaction where the aluminum oxide for the electrolyic extraction of aluminum is obtained by heating aluminum hydroxide. T16 522 8 t5l (iii) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina. (iv) l{rile the equation for the reaction that occurs at the cathode during the extraction of aluminum by electrolysis. (v) Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis. (b) State what would you observe when: (i) Washing Soda Crystals are exposed to the atmosphere. (ii) The salt ferric chloride (c) 12) is exposed to the atmosphere. Identify the cations in each of the following case: (i) t3l NaOH solution when added to the Solution (A) gives a reddish brown precipitate. (ii) NHaOH Solution when added to the Solution (B) gives white ppt which does not dissolve in excess. (iii) NaoH Solution when added to Solution (C) gives white ppt which insoluble in excess. Tt6 522 is

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