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ICSE Class X Mid-term 2024 : Biology

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Shlok Dubey
Parle Tilak Vidyalaya, Mumbai
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Time : 2 hr Prelim 3 Marks : 80 Section A Question 1: Choose one correct answer to the questions from the given options. [15] i) In Electro refining of copper using acidified copper, which of the following is /are correct? (I) Pure copper is used at cathode (II) Impure copper is used as anode . (III) Reduction takes place at cathode. (IV) Platinum electrode is used as anode. (a) I,II, and III (b) II,III, and IV (c) I,III,IV (d) I,II,IV ii) Some students were working in the lab, the teacher gave them a compound P and asked them to add conc. Sulphuric acid , then she asked them to test the gas formed using moist blue litmus paper. The students observed that the blue litmus changed its color to red. Help the students to identify the compound P: (a) Zinc sulphate (b) Ammonium Carbonate (c) Copper nitrate (d) Sodium chloride iii) Ammonia gas is passed through following solution. Which of the following observation is correct? Red litmus solution Phenolphthalein solution X Blue Pink Y Red Colorless Z Blue Blue M Red Green a) X b) Y c) Z d) M iv) The solution in which Aluminium ore dissolves (a) Calcium hydroxide (b) Sodium hydroxide (c) Copper sulphate v) An electrolyte which dissociated completely in to ions : (a) Acetic acid (b) Ammonium hydroxide (c) Sodium hydroxide (d) Silver nitrate (d) Oxalic acid vi) An element X; attracts the electron towards itself, it must belong to : (a) Group 1 (b) Group 17 (c) Group 2 (d) Group 18 vii) The molecular formula of an organic compound is C49H106 , the hydrocarbon will belong to : (a) Alkanes (b) Alkenes (c) Alkynes (d) None of the above vii) The molecular mass of a compound is 88 amu having empirical formula C2H4O. Its molecular formula would be. (a) C2H4O2 (b) C4H8O2 (c) C8H4O2 (d) C2H8O2 (ix) The role of CuO or PbO in the experiment shown in diagram is : a) Oxidizing agent (b) Dehydrating agent c) Reducing agent d) Catalyst x) The product formed at the cathode in electroplating of an article with nickel is : (a) Hydrogen gas (b) Nickel ions (c) Nickel atoms (d) Oxygen gas xi) Ammonia molecule contains _____ (a) A triple covalent bond and one lone pair of electrons (b) Three single covalent bonds and two lone pair of electrons (c) Three single covalent bonds and one lone pair of electrons (d) A double covalent bond and one lone pair of electrons xii) The method of preparation used for preparation of iron(II) chloride is : (a) Synthesis reaction (b) Displacement reaction (c) Double displacement reaction (d) Decomposition reaction. xiii) During the electrolysis of acidified water which of the following takes place: (a) Oxygen is released at cathode (b) Oxygen is released at anode (c) Sulphur dioxide is released at anode. (d) Hydrogen is released at anode. xiv) Carbon to carbon double bond is found in: (a) 2-butylene (b) Acetic acid (c) Acetaldehyde (d) Ethyl alcohol xv) Assertion:(A) Few drops of dilute acid is added to a solution of zinc sulphide , a colorless gas is formed with rotten egg odour. Reason (R ) Gas formed does not turn moist lead acetate paper silvery black. (a) Both A and R are true (b) A and R are true ,but R is the correct explanation of A (c) A is true , but R is not the correct explanation of A (d) Both A and R are false Question 2: (i) Match the columns : A 1) Iso butane 2) Neo -pentane 3) Iso pentane 4) n butane 5) 2 Butyne [5] a) b) c) d) e) B 2 methyl butane Position isomer Butane 2 methyl propane 2,2 dimethyl propane (ii) Complete the following statements : [5] 0 0 a) The atomic size of Boron is 0.88 A , and that of nitrogen is 0.70 A .h Nitrogen lies to the ________(left/right) of boron b) The correct order of increasing volatility of the acid is ________ 1. HCl < CH3COOH < HNO3 2. CH3COOH < HCl < HNO3 3. HNO3 < HCl < CH3COOH 4. HCl < HNO3 < CH3COOH c) Hydrocarbon X decolorizes bromine in carbon tetrachloride ,and hydrocarbon Y does not decolorize bromine water. Both of the compounds burn with a sooty flame. The molecular formula of X and Y is ________ (C5H12 and C4H8 / C5H8 and C4 H10) d) In an electrolyte solution two ions X1+ and Y1+ are present , X got discharged at cathode, the relative position of X in metallic series will be , X is _________(higher /lower ) than the position of Y e) An aqueous solution of X turns red litmus blue, so it must contain _______ ions. ( Hydrogen/Hydroxyl) (iii) Explain the following : [3] a) Ionization energies of 4 elements A, B,C,E, D are 496, 403, 520, 419 KJ/mol, respectively. If these elements belong to the same group in the periodic table, which element will occupy the top position in the group? Justify your answer. b)During the extraction of Aluminium bauxite , is reduced by the electrolytic method. c) A fuse wire is an alloy of tin and lead. It is a safety device that prevents the damage of electronic gadgets due to excessive flow of current, can copper replace tin when making alloys? Explain. (iv) Write the structural formula for the following organic compounds : (a) 2 methyl propene (b) 1,2 dichlro ethene (c) Propyne [3] (v) Give IUPAC names for the following compounds : 1) [2] 2) (vi) Identify the following terms/processes: [5] a) The property by which an element present in period 2 , group 14 forms a long chain of identical atoms. b) A substance which does not dissociate into free ions. c) The energy released on adding an electron to the outer most shell of an atom in its gaseous isolated state . d) The process used to extract Aluminium from Alumina by electrolytic reduction. e) Hydroxy derivatives of alkanes obtained by replacement of hydrogen atoms of alkanes by corresponding number of hydroxyl groups. (vii) Using the acid produced by contact process, how will you obtain Sulphur dioxide gas as one of the products using the following: [2] a) A yellow non metal b) An active metal below Aluminium in activity series of metals. Section B (Solve Any four questions from this section) Question 3: (a) Pertaining to the electrolysis of molten lead bromide, answer the following questions: i) Write the equation at cathode. ii) Write the observation at anode. iii) Which type of electrodes are used in this electrolysis. [3] (b) Distinguish between the following pair of compounds using the reagent given in the bracket: i) MnO2 and CuO ( using conc. HCl) ii) Calcium nitrate and lead nitrate ( using NaOH) [2] (c) Write balanced chemical equations for the following reaction. [3] i) Laboratory preparation of marsh gas using sodium acetate. ii) Reaction of ethene with chlorine iii) Laboratory preparation of a gas , which gives dense white fumes when glass rod dipped in hydrogen chloride is brought near it. (d) Galena when roasted reacts to according to the equation given below: 2PbS + 3O2 2PbO + 2SO2 [RMM of PbO = 223, RMM of PbS = 239 g] Calculate : i) The weight of PbO formed when 478 g of PbS ii) Weight of PbS required to produce 5.6 lit of SO2 at S.T.P [2] Question 4: (a) In 12 g of magnesium , calculate : (Atomic mass of Mg = 24) i) Number of gram atom ii) Number of mole. [2] (b) Calculate the vapour density of carbon monoxide [Atomic mass C= 12, O= 16] [2] (c) The hydrocarbon acetylene C2H2 burns in air to form carbon dioxide and water vapour. i) Write a balanced equation for the reaction. ii) Calculate the volume of oxygen required to burn 10 liters of acetylene. iii)Calculate the volume of carbon dioxide formed at the same time [3] (d) Identify the gas: i) That reacts with hydrogen chloride to give a white solid. ii) That is acidic in nature and forms mist in the air. iii) The gas which turns lead acetate paper shiny black [3] Question 5: (a) Observe the table and answer the following questions: [3] Element A B C Atomic mass number 24 16 19 Number of neutrons 12 8 10 i) Which element is more electronegative, B or C ? ii) Draw an electron dot diagram to show the formation of the compound between A and B iii) Identify element A; and write the balanced chemical equation for the reaction of the nitride of the element A with warm water. (b) Identify the substances: [3] i) Nitric acid reacts with compound Q to give a salt magnesium nitrate ,water and carbon dioxide Identify Q ii) The property of conc. Sulphuric acid when it reacts with copper to produce Sulphur dioxide gas. iii)The gas evolved when ethene undergoes hydrogenation. (c) Mention the role played by the following in the Hall Herold s process: i) Powdered coke ii) Cryolite [2] (d) Write the balanced chemical equations for the following : i) Preparation of ethene from bromoethane ii) Esterification reaction. [2] Question 6: (a) With reference to the electroplating with silver answer the following questions: [3] i) Why silver argentocyanide is preferred over silver nitrate. ii) Of what substance must cathode and anode be made up of. iii) Write equation taking place at cathode. (b) Observe the diagram answer the following questions: [3] i) Name the two gases which can be used in this experiment. ii) State the color of the fountain formed, if methyl orange is used in place of red litmus solution. iii) Give observation when ammonia burns in the atmosphere of oxygen in the absence of a catalyst. (c) State the particles present in : i) Acetic acid ii) Glucose solution. [2] (d) Element M and N for an electrovalent compound, answer the following questions; [2] i) Which physical state will the compound MN exist in normal condition.? ii) What is the condition required for MN to conduct electricity. Question 7: (a) A compound P consist of 4.8 % carbon and 95.2 % bromine by mass. [3] i) Determine the empirical formula of this compound working correct one decimal . ii) If the vapour density of the compound is 252 , calculate the molecular formula of the compound. [C = 12, Br = 80] (b) Name the drying agent used in the preparation of hydrogen chloride gas . Explain why this drying agent is used. [2] (c) From the list of salts : PbCl2, CuCl2, AgCl , CuCO3 , FeCl2( One salt can be used only once) [3] i) On heating the salt changes from green to black ii) A salt soluble in hot water but soluble in cold water. iii)A salt prepared by displacement reaction (d) An element belongs to the period 3 and group 2 of the periodic table. Answer the following i) Is the above element is a good oxidizing or reducing agent. ii) Which types of ions the above element will form ? [2] Question 8: (a) If a Compound has empirical formula CH2O and its molecular weight is 180, calculate its molecular formula. Find the amount of carbon in 1 mole of compound. [C = 12, H = 1, O = 16] [3] (b) Equation for the reaction when compound A is bubbled through bromine dissolved in carbon tetrachloride is as follows: [3] i) Draw the structure of A. ii) State your observation during this reaction. (c) Propanal, Propanol and Propanoic acid have three carbon atoms having different functional groups using this information complete the following: [3] i) _______ _____ has alcoholic functional group. ii) Draw the structural formula of Propanoic acid. iii)____ ______ is the functional group in Propanal. d) Identify the term : The ratio of mass of certain volume of a substance to the mass of equal volume of hydrogen . [1]

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