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ICSE Class 8 Sample / Model Paper 2023 : Chemistry

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VIBGYOR HIGH Second Term Examination AY 2023-2024 CHEMISTRY SAMPLE PAPER Grade: VIII Max. Marks: 80 Date: dd/mm/2024 Time allowed: 2 hour __________________________________________________________________________________ INSTRUCTIONS: 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 allowed for writing the answers. Attempt all questions from Section A and any four questions from Section B. The intended marks for the questions or parts of questions are given alongside in brackets [ ]. This question paper contains 11 printed pages. _________________________________________________________________________________ SECTION- A (40 Marks) Attempt all questions from this Section Question 1 Choose the most appropriate answer for each of the following: (i) (ii) Hairspray is an example ofa) True solution b) Colloidal solution c) Solution d) Suspension Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid (iii) Evaporation of water 1 P.T.O [15] (iv) Sublimation of camphor (crystals) (iii) a) (i) and (ii) b) (ii) and (iii) c) (i) and (iv) d) (ii) and (iv) What type of chemical reactions take place when electricity is passed through water? a) Displacement b) Decomposition c) Combination d) Double displacement (iii) Which among the following statement(s) is (are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to(i) the formation of silver by decomposition of silver chloride (ii) sublimation of silver chloride (iii decomposition of chlorine gas from silver chloride (iv) oxidation of silver chloride a) (i) only b) (i) and (iii) c) (ii) and (iii) d) (iv) only (iv) Bituminous is a common type ofa) calcium b) borax c) coal d) coke (v) A metal which does react vigorously with cold water isa) Cu b) Mg c) Na d) Pb (vi) Basic oxides area) Non- metallic oxide b) Amphoteric oxide c) Metallic oxide d) Acidic oxide (vii) In the combined state, carbon occurs asa) Coal b) Diamond c) Petroleum d) Graphite (viii) The reaction between nitrogen and hydrogen is an example of(i) Exothermic, catalytic, reversible reaction (ii) Reversible, endothermic, combination reaction (iii) Exothermic, irreversible, decomposition reaction (iv) Catalytic, endothermic, displacement reaction (ix) Which of the following is known as the Black lead? a) Charcoal b) Diamond c) Graphite d) Fullerenes (x) It is an example of (i) Chemical reaction (ii) Decomposition reaction (iii) Oxidation reaction 3 P.T.O a) (i) and (ii) b) Only (ii) c) (i) and (iii) d) All of these (xi) Magnesium ribbon is rubbed before burning because it has a coating ofa) basic magnesium carbonate b) basic magnesium oxide c) basic magnesium sulphide d) basic magnesium chloride (xii) Which among the following contains the highest percentage of carbon? a) Peat coal b) Anthracite coal c) Bituminous coal d) (xiii) Lignite coal Name the products formed when iron filings are heated with dilute hydrochloric acid. a) Fe (III) chloride and water b) Fe (II) chloride and water c) Fe (II) chloride and hydrogen gas d) Fe (III) chloride and hydrogen gas (xiv) Tyndall effect is seen in which type of solution? a) True solution b) Suspension c) Colloidal d) Supersaturated solution (xv) Give the ratio in which hydrogen and oxygen are present in water by volume. a) 1:2 b) 1:1 c) 2:1 d) 1:8 Question 2 (i) Complete the following by choosing the correct word from the [5] bracket provided: a) Solubility of sugar in water _____________with increase in temperature. (increases/ decreases) b) __________ reaction processes with absorption energy in form of heat. (Endothermic/ Exothermic) c) ___________ is stable to heat. (Sodium carbonate/ Sodium nitrate) d) Coke is prepared by _________ distillation of coal. (fractional/ destructive) e) Carbon dioxide is slightly ________ in nature. (acidic/basic) (ii) Answer the following questions: [5] a) What is the effect on boiling point of water when pressure is increased? b) Why carbon dioxide is used in fire extinguisher? c) Why carbon monoxide is called as silent killer? d) What is anhydrous crystals? e) What are the factors on which rate of reaction depends? (iii) State one relevant observation for the following: [5] a) Action of heat on mercuric oxide. b) Addition of water to calcium oxide. c) Action of heat on copper carbonate. d) When copper metal is added to a trough of water. e) When a piece of wood charcoal and copper oxide is heated. 5 P.T.O (iv) Match the following: [5] Column A Column B a) Gypsum 1. Carbon dioxide b) Slightly sour taste 2. Electrodes c) Calcium bicarbonate 3. Dihydrate d) Anhydrous Calcium chloride 4. Heptahydrate e) Diamond 5. Drying agent 6. Temporary hardness in water 7. Tetrahedral (v) Complete and balance the following chemical reactions: a) Al + H2O (steam) b) FeCl3 + NaOH c) NH3 + CO2 (g) d) CH4 + O2 (g) Heat e) Ca (NO3)2 (s) Heat [5] SECTION-B (40 Marks) Attempt any four questions from this section Question 3 (i) Which one from the following is a/an- [2] ZnO, Al(OH)2, Na2O2, Pb3O4 a) Amphoteric oxide b) (ii) Mixed oxide State whether the following statement is True or False: [2] a) Graphite is the purest form of carbon. b) Lampblack oxidizes heated metallic oxide to their respective metals. (iii) Identify the types of following chemical reactions: a) ZnSO4 (aq) + 2NH4OH(aq) (NH4)2SO4 (aq) + Zn(OH)2 (s) [3] b) 2Pb3O4(s) Heat 6PbO (s) + O2(g) c) 2NaOH + H2SO4 (iv) Na2SO4 + H2O Answer the following questions in short: [3] a) How do the solubility of a solid and a gas gets affected by increase in temperature? b) State any two characteristics of potable water. c) Starting from carbon dioxide, how would you obtain black particles of carbon? Question 4 (i) Complete the statements given by filling in the blanks by [2] choosing the only word given in the bracket: a) A solution which can dissolve any more of a solute at a given temperature, is called ____________________. (saturated / unsaturated) b) Direct combination reaction of phosphorus with oxygen gives __________________. (P2O3/ P2O5) (ii) Write a balanced chemical equation for the formation of calcium [2] bicarbonate starting from carbon dioxide (iii) Answer the following questions: [3] a) Why is diamond very hard? b) How wood charcoal finds its application in gas masks? c) Graphite is used in refractory crucible. Justify. (iv) Write a balanced chemical equation for the following conversions: a) Conversion of lead carbonate to lead oxide. b) Reduction of solid zinc oxide to zinc. c) When solid zinc hydroxide is heated strongly. 7 P.T.O [3] Question 5 (i) Give one word or phrase for the following statements: [2] a) A mixture of 95% oxygen and 5% carbon dioxide. b) An extreme condition caused by lack of oxygen resulting in unconsciousness or death. (ii) (iii) Name the products obtained in the following reaction: a) Addition of dil. hydrochloric acid to aqueous KOH. b) Addition of water to Sulphur dioxide. State a relevant reason for the following statements: a) [2] [3] A chilled soft drink bottle does not produce a lot of effervescence on opening. b) As both CO2 and SO2 gas turns lime water milky. Aqueous potassium permanganate solution helps in distinguishing the two gases. c) (iv) It is dangerous to be in the vicinity of smokers. Differentiate the following terms: (Any one point each) a) [3] Thermal decomposition and Thermal dissociation reaction. b) Permanent and temporary hard water. c) Catalyst and promoter. Question 6 (i) Answer the following questions based on the given diagram in template given below : [3] Before heating After heating Colour of the substances a) _______ b) ________ Shape of the crystal c) _______ d) ________ Nature of the substances e) _______ f) ________ (Crystalline/ amorphous) (ii) Fill in the blanks: [2] a) Carbon monoxide is collected by _____________of water. b) Carbon monoxide burns in air with a ____________ flame to form carbon dioxide. (iii) Answer the following questions with reference to the given [3] diagram: a) Name the element from which both diamond and graphite are formed b) Write two differences between the physical property of graphite [1] [2] and diamond. (iv) Name the following: [2] a) A spherical form of carbon containing 60 atoms. b) A gaseous product obtained during destructive distillation of wood. Question 7 (i) Distinguish between true solution and colloidal as indicated in the brackets: (Size of solute and type of mixture) 9 P.T.O [2] (ii) Match the description given below (a) and (b) with the following [2] compounds (1 to 3): (iii) (iv) a) Alcohol, phosphoric acid b) Iron, Vanadium pentoxide, Platinum, pepsin 1. Promoter 2. Positive catalyst 3. Negative catalyst Write a word equation for the following chemical reactions: a) Passage of nitrogen and oxygen through electric arc. . b) Formation of methyl alcohol using carbon monoxide. c) Catalytic oxidation of ammonia. Observe the diagram given below and answer the questions [3] [3] pertaining to the preparation of carbon monoxide: a) Name the reactants labeled as X and Y. [2] b) Why potassium bicarbonate is used in the laboratory preparation [1] of gas? Question 8 (i) Write a balanced chemical equation for the following conversions shown for E and F: [2] (ii) The representation shows the laboratory preparation of Carbon [2] monoxide: a) Write a balanced chemical equation for the above reaction. b) Name the reactants labeled as X and Y. (iii) Define the following terms: [3] a) Destructive distillation of wood b) Adsorption c) Water of crystallization (iv) Answer the following questions: [3] a) Baking powder is prepared by the reaction between baking [1] soda, potassium hydrogen tartrate and starch. Give reason how the mentioned reaction makes dough fluffy and light? b) State one property of carbon monoxide used in the metallurgy for extraction of Iron from its ore. Support your answer with a balanced chemical equation. ***** 11 P.T.O [2]

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