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TBayal Arademy Pre-Board Examination Class: X Subject: Chemistry Session: 2022 2023 Time 2 Hrs. Full Marks: 80 Section - A [Attempt all questions from this section] Question 1. [15] Choose the correct answer to the questions from the given options A. The blue colour of aqueous copper sulphate solution remains unchanged during electrolysis due to i) Platinum electrode ii) Zinc electrode iii) Graphite electrode iv) Copper electrode B. The non-metallic character of the elements down the group - i) First decreases the increases C. i) The main ore used in the extraction of iron is ii) Calamine Cryolite D. i) Colour of sulphuric acid is ii) A colourless liquid Green in colour E. The IUPAC i) Ethyne F. i) Which of the following is not a polar molecule? ii) HCI CCl4 G. What happens when blue litmus paper is introduced in dilute hydrochloric acid? name iii) Decreases ) Increases iv) Remains the same iv) Bauxite iii) Haematite iii) Yellow in colour iv) Blue in colour of ethylene is ii) Ethene - iv) Propere ii) Ethane iv) NH3 ii) H,0 i) No change in litmus paper iv) Litmus paper turns yellow i) Litmus paper turns green ii) Litmus paper turns red H. Hydroxide ofthis metal is soluble in sodium hydroxide solution ii) Silver ii) Lead i) Magnesium empirical formula of CHCOOH will be I. The i) CHO2 J. The catalyst used in the contact process isii) Iron Copper i) ii) C2HO K. An example of organic acid in the following ii) Acetic acid i) Hydrochloride acid iv) Copper - iv) C.H02 ii) CH,0 ii) Vanadium perexide iv) Manganese dioxide PCrlDxicle compound is - iii) Sulphuric acid iv) Nitric acid The method used for the collection of hydrogen chloride gas is ii) Upward displacement of air Downward displacement of air iv) Contact process West ward displacement of air - L. i) ii) M. A hydrocarbon which is a green house gas i) Acetylene ii) Ethylene iii) Ethane iv) Methane N. Alumina is reduced to aluminium by i) Alumina is highly stable iii) Alumina is not reduced by Fused electrolytic reduction, since drying agents 0. i) ii) Alumina is least stable iv) Alumina is not reduced by reducing agents Among the elements of period 2, the element which Lithium ii) Carbon has high electron affinity 1S iv) Fluorine iii) Chlorine Question 2. A. The diagram given below shows the electroplating of an article with silver. questions based on the process Answer the following Battery Areenelers Block of s er Arecle o be platecl Na Rac Soluion a) Name the cathode and anode used in this process. b) Why is Na[Ag(CN)2] preferred over AgNO; as electrolyte? c) Give the reactions occurring at cathode and anode. d) Give the dissociation reactions taking place. e) The overall strength of silver ions remains constant B. Match the Column A following Column A with Column B in the reaction. - Lower the fusion temperature b) Haber's process c) A strong alkali d) e) Metal which forms more than one type of positive ion Metal that evolves a gas (gives a pop sound) i) Iron ii) Na3AlF6 when reacts with dilute mineral acid ii) Zinc iv) Ammonia v) NaOH Complete the following by choosing the correct answers from the bracket a) Electrovalent b) A particular solution contains molecules and ions of the solute, so it is a compounds are soluble in The pink metal [5) (polar/ organic) solvents. salt solution/ strong acid) c) [5 Column B a) C. Why? (weak acid/ deposits at the cathode, during the electrolysis of the solution of its salt (Copper () sulphate / Lead bromide) d) The electron releasing tendency of zinc is e) Down the group, ionization potential (more/ less) than that of copper. (increases/decreases) Identify the following: [5 The first member of alkene series present in natural gas. b) A catalyst used in Haber's process. c) The element which has highest ionization potential. d) The catalyst that is used during oxidation of SO2. e)he amount of energy released while converting a neutral gaseous isolated atom into a negatively charged gaseous ion by the addition of electron. a) E. Answer the following - a) Draw the structural formula for the following: i) 2, 2-dimethylpropane ii) 2-methylpropene b) ii) Methanol Name the following organic compounds in IUPAC system. H H HO H H-C-C-C-H ii) H C-C-C -OH HH H Br H Section - [Attempt any FOUR H B questions from this section] [2+2+3+3] Question3. Identify the a) (i) A salt present in each salt "M' on treatment of the following: with conc. H2SO4 produces fumes with ammonia. dilute H2SO4 produces (ii) A salt 'D' on treatment with solution. dichromate effect on acidified potassium b) Write the i) c) and gas which fumes in moist air a Fe Cl3 a gas which turns lime water gives dense milky but has no products and balance the equation: + ii) Mgs Na NaOH > Arrange the following as per instruction given in the + H0 > brackets: hegaivty order of electron gativity) i) F, Cl, Br, I (decreasing of atomic size) order ii) F, Cl, Br, I (increasing order of atomnic size) ochormi cc ii) F, Cl, Br, I (Increasing d) Fill in the blanks i) ii) by selecting appropriate word from the given choice (H20, NH3) pairs of electrons covalent compound. is (HCI/N2) an example of nonpolar lone A molecule which has two formed iii) lonic bond is ionization enthalpy more easily between elements with comparatively (low/ high) Question 4 For each of the process a) [2+2+3+3] given below, whut i) Electroplating is the use of it? (ii) Electrolytie refining D)An organic compound on analysis was found to contain 10.06 % of carbon, 0.84 % of hydrogen and 89.10% of chlorine. What will be the empirical formula of the substance? ) Determine the molecular formula of the compound which has empirical formula CsH,N and vapour density is 39.5 c) The following questions are pertaining to the preparation of HCl gas in laboratory: i) Why hydrogen chloride gas is not dried by using phosphorus pentaoxide' ii) Hydrogen chloride gas is collected by the upward displacement of airf. Give reason. iii) Why hydrogen chloride gas is not collected over water? d) Explain the following i) Fuming nitric acid looks yellow or yellow brown. ) In the contact process SOj is dissolved in Conc. H,S04 and not in water. iii) Blue vitriol is treated with conc H2SO4 it becomes white. Question 5. a) [2+2+3+3] i) State the relevant observation. When erystals of copper nitrate are heated in a test tube? (ii) Give the balanced chemical equation for the action of dilute HhSO4 on sodium sulphite. b) Name the gas evolved in each ofthe following: (i) Water is added a calcium carbide. (ii) A brown coloured gas liberated on decomposition of nitric acid. c) Give the balanced chemical equations for the following reactions: (i) Lead nitrate reacts with dilute sulphuric acid. (ii) Barium chloride is treated with dilute sulphuric acid. (ii) Copper (1I) sulphate solution is treated with excess ammonium hydroxide solution. d) State one revelent observation for the following reactions (i) When aqueous copper sulphate solution is electrolyzed using Cu electrode. (ii) Ethene is bubbled through a solution of bromine in carbon tetrachloride. (ii) Glass rod dipped in ammonium hydroxide is brought near the mouth of the conc hydrochloric acid bottle. [2+2+3+3] Question 6. a) Define: (i) Ore i) Hydrocarbons b)Solve and organic compound with vapour density 94 contains C=12.67% Find the molecular formula [Atomic mass ofC =12, H=1, Br= 80] c)State the conditions required for the following reactions i) ii) Conversion of sodium chloride to sodium bisulphate. Conversion of sodium nitrate to nitric acid. i ) Conversion of olewn to H;S04 H=2.13% and Br=85.4% Give example of the following (i) Acid salt (i) Ore of aluminiunm metal (ii) Weak alkali Question 7. a) [2+2+3+3] Differentiate between following pairs with one example: electrolyte i) Strong electrolyte Vs Weak ii) Mineral Vs Ore b) ldentify the functional group in the following organic compounds : i) CH3-CH - CH3 ii) CH3 - CH2 -CH2 - CH = CH2 OH c) Answer the following questions i) What is the function of cryolite used along with alumina as the electrolyte? ii) Why is powdered coke sprinkled on the top of the electrolyte? i1) Name the electrode, from which aluminium is collected. d) etheme Choose the answer from the list which fits the description [Ethane, ethane, ethanoic acid, ethyne, ethanol diethyl ether] i) The compound with - OH as the part of its structure. ii) The compound with - COOH as the part of its structure. i) First member of homologous series with general formula CnH2n Question 8. a) [2+2+3+3] Draw the electron dot structure of the following (i) NH4 i) Mg Ch b) Distinguish between the following as directed i) Calcium sulphite and calcium carbonate using dil HCI. ii) Lead nitrate solution and zinc nitrate solution using ammonium hydroxide. c) Name the particles present in i) Hydrogen sulphide ii) Copper nitrate iii) Calcium carbonate d) An element X belongs to 3 period and 2" group Answerthe following questions: i) What is the atomic number and name of the element X? ii) What will be the valency of element 'X'? ii) It is a metal or non metal.
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