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ICSE Class X Prelims 2021 : Chemistry (Jankidevi Public School (JPS), Mumbai)

6 pages, 99 questions, 92 questions with responses, 93 total responses,

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SECOND PRELIMINARY EXAMINATION 2020-2021 STD: X TIME: 2 hrs. CHEMISTRY DATE: 16.02.2021 SCIENCE Paper 2 MARKS: 80 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 answers. This paper is divided into two sections. Attempt all the questions from section I and any four questions from section II. The intended marks for questions or parts of questions are given in brackets []. This paper consists of six printed pages. Nothing should be written on the question paper. Section I (40 marks) Attempt all questions from this section. Question 1 a) Choose the most appropriate answer from the following options: [5] i) Among the period 2 elements, the element which has high electron affinity is A. Lithium B. Carbon C. Chlorine D. Fluorine ii) Among the following compounds, identify the compound which has all three bonds (ionic, covalent and coordinate bond). A. Ammonia B. Ammonium chloride C. Sodium hydroxide D. Calcium chloride iii) Identify the statement which is incorrect about alkanes: A. They are hydrocarbons. B. There is a single covalent bond between carbon and hydrogen. C. They can undergo both substitution as well as addition reactions. D. On complete combustion, they produce carbon dioxide and water. iv) Which of these will act as a non-electrolyte? A. Liquid carbon tetrachloride C. Sodium hydroxide aqueous solution acid B. Acetic acid D. Potassium chloride aqueous solution v) Which one of the following will not produce an acid when made to react with water? A. Carbon monoxide B. Carbon dioxide C. Nitrogen dioxide D. Sulphur trioxide 1 Cont d on page 2 b) Match the following: Ions i) ii) iii) iv) v) Pb2+ Cu2+ Fe2+ Zn2+ Fe3+ [5] Colour of precipitate and solubility in excess of NH4OH A. Dirty green ppt. insoluble B. Chalky White ppt. insoluble C. Gelatinous White ppt. soluble D. Reddish brown ppt. insoluble E. Blue ppt. soluble c) Identify the gas evolved in the following reactions when: [5] i) Sodium propionate is heated with soda lime. ii) Potassium sulphite is treated with dilute hydrochloric acid. iii) Sulphur is treated with concentrated nitric acid. iv) A few crystals of KN03 are heated in a hard glass test tube. v) Concentrated hydrochloric acid is made to react with manganese dioxide. d) Write the balanced chemical equation for the following reactions: [5] i) Tri chloro methane is reacted with chlorine in the presence of uv light. ii) Dilute hydrochloric acid is added to sodium bicarbonate. iii) Ammonia is passed through copper (II) oxide. iv) Aluminium oxide is heated with sodium hydroxide solution. v) Potassium nitrite is obtained from potassium nitrate. e) What do you observe in the following cases? [5] i) Ethene is passed through an alkaline solution of KMnO4. ii) Ammonia is passed through Nessler s reagent. iii) Hydrochloric acid is added to silver nitrate solution. iv) Lead nitrate is strongly heated. v) Ammonia is passed over lead (II) oxide. f) i) Draw the structural formula of the following compounds: [3] A) Propan-2-ol B) 2-methyl propane. C) Ethanoic acid. ii) Rewrite the following using greater than or lesser than. [2] A) The ionization energy of sodium is--------potassium. B) The reducing power of sodium is--------magnesium. 2 Cont d on page 3 g) Correct the following statements by changing the highlighted words: [5] i) Ionic compounds undergo ionization when dissolved in water. ii) In a molecule of ammonia there are two bond pairs and two lone pairs of electron. iii) Argon has the highest ionization energy in the periodic table. iv) Molecular formula shows the simple whole number ratio between the atoms of the elements in the compound. v) The rocky impurities associated with the ore are called flux. h) M is a metal above hydrogen in the activity series and its oxide has the formula MO. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer the following: [5] i) What kind of bond is formed between M and O? ii) How many electrons are there in the outermost shell of M? iii) Name the group to which M belongs. iv) State the reaction taking place at the cathode. v) Name the product at the anode. SECTION II (40 Marks) Attempt any four questions from this section. Question 2 a) Give scientific reasons for the following statements. i) Iron is rendered passive with fuming nitric acid. ii) An aqueous solution of sodium chloride conducts electricity. iii) Cl- ions are larger in size than Na+ ions. iv) Alkali metals are good reducing agents. v) Hydrogen chloride gas cannot be dried over quick lime. b) Give the scientific terms for the following: i)The ability of carbon to form long chain. ii) Compounds containing carbon and hydrogen only. iii) The type of reaction undergone by alkenes. iv) The type of isomerism exhibited by but-1-ene and but-2-ene. v) The type of isomerism exhibited by n-butane and 2-methyl propane. [5] [5] Question 3 a) Give reasons for the following with respect to the process of electrolysis: [5] i) In the process of electroplating an article with silver, sodium silver cyanide is preferred as an electrolyte to silver nitrate. 3 Cont d on page 4 ii) When copper sulphate solution is electrolyzed using platinum electrode, the blue colour of the solution fades. iii) During the process of electrolysis of water, acidification is done by adding sulphuric acid and not by adding hydrochloric acid or nitric acid. iv) Silica crucible is used as voltameter in the electrolysis of molten lead bromide. v) Electrolysis is an example of redox reaction. b) The Diagram shows the laboratory preparation of HCl gas. Answer the questions given [5] below. i) Identify A, B and C. ii) What does the method of collection tell you about the density of hydrogen chloride? iii) Write the equation for the reaction. iv) Why nitric acid cannot be used for preparation of HCl gas? v) How would you check whether the gas jar is filled with hydrogen chloride? Question 4 a) Find the total percentage of nitrogen in magnesium nitrate crystals Mg(NO3)2.6H2O. [3] [H=1, N=14, O=16, Mg=24] b) A compound of carbon and hydrogen contains 92.3% C and has a vapour density 39. [C=12, H=1] i) What is its empirical formula? ii) What is its molecular formula? iii) Give the IUPAC and common name of the compound. iv) Give the IUPAC name of the compound formed if the above compound is hydrogenated in excess of hydrogen. v) Give the balanced chemical equation for the Q. (iv). 4 [2] [2] [1] [1] [1] Cont d on page 5 Question 5 a) Use the letters only written in the periodic table given below to answer the questions that follow :(Do not identify the element ) I II 1 2 Q 3 R 4 T 5 i) State the number of valence electron in E. ii) Which element shown forms an ion with triple positive charge? iii) Which metallic element is more reactive than R? iv) Which element has highest electron affinity? [4] III IV V A B C VI VII 0 L D E Z b) Define the following terms: i) Homologous series ii) Indicators. [2] c) The following table shows the electronic configuration of the elements M, N, O, P. Element M N O Electronic 2,8,1 2,8,7 2,5 configurations Answer the following questions based on the table above: P 1 i) What type of bond is formed between: A) M and N B) O and P [2] ii) What is the formula of the compound formed between: A) M and N B) O and P [2] Question 6 a) Answer the following questions with respect to the laboratory preparation of nitric acid. [4] 5 Cont d on page 6 i) What is A and B respectively? ii) What is the purpose of cold water? iii) Complete apparatus is made of glass. Give reason. iv) What should be the temperature of the reaction? b) Give a chemical test to distinguish between the following pairs of compound: i) Sodium chloride and Sodium nitrate. ii) Ethene and Ethyne iii) Calcium chloride and Zinc chloride [3] c) Classify the following as strong electrolyte, weak electrolyte and non- electrolyte: [3] i) Sucrose solution ii) Sodium nitrate solution iii) Molten sodium chloride iv) Lithium chloride solution v) Tartaric acid. vi) Ammonium hydroxide solution Question 7 a) What property of conc.H2SO4 is made use of in each of the following cases? Give [5] an equation for the following reaction in each case: i) In production of HCl gas when it reacts with a chloride. ii) In the preparation of CO from HCOOH. iii) As a source of hydrogen by diluting it and adding a strip of magnesium. iv) In the preparation of sulphur dioxide by warming a mixture of Conc. Sulphuric acid and copper turnings. v) Diluting the conc. sulphuric acid and reacting with Iron(II) oxide. b) Answer the following questions with respect to the metallurgy of Aluminium. i) Name the chief ore of Aluminium. ii) A layer of powdered coke is sprinkled over the electrolytic mixture. Give reason. iii) Give balanced chemical equation for the reaction taking place at cathode and anode respectively. iv) Cryolite is mixed with molten alumina during the extraction process. Give reason. v) Anode needs to be replaced periodically. Give reason. *************** 6 [5]

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