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IKAT Academy, 109,1stFloor,PratapComplex,NearMunirkaMetroGateNo3, , CLASS 10 - SCIENCE, Acids, bases and salts, Time Allowed: 1 hour and 30 minutes, , Maximum Marks: 40, , General Instructions:, IKAT Academy, There are total 40questions., All questions are compulsory., Total time allotted is 90 minutes., Please give the test honestly and seriously., All the best!, , 1., , The raw materials that are required for the manufacturing of washing soda by the Solvay, , [1], , process are:, , 2., , a) NH4OH, CaCO3, NaCl, , b) NaCl, CaCO3, NH3, , c) NaCl, NH4OH, CaO, , d) NH3, CaCl2, CaCO3, , In an attempt to demonstrate electrical conductivity through an electrolyte, the following, , [1], , apparatus was set up Which among the following statement(s) is(are) correct?, , i. Bulb will not glow because electrolyte is not acidic, ii. Bulb will glow because NaOH is a strong base and furnishes ions for conduction, iii. Bulb will not glow because circuit is incomplete, , Contact No. 9555561066, 9142935757, , 1/6

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iv. Bulb will not glow because it depends upon the type of electrolytic solution, , 3., , a) (iv) only, , b) (ii) and (iv), , c) (ii) only, , d) (i) and (iii), , A student was given four unknown colourless samples labelled A, B, C and D and asked to test, , [1], , their pH using pH paper. He observed that the colour of pH paper turned to light green, dark, red, light orange and dark blue with samples A, B, C and D respectively. The correct sequence, of increasing order of the pH value for samples is, , 4., , 5., , a) C < B < A < D, , b) A < B < C < D, , c) A < D < C < B, , d) B < C < A < D, , Which of the following salts does not contain water of crystallisation?, a) Washing soda, , b) Blue vitriol, , c) Baking soda, , d) Gypsum, , When HCl reacts with granulated zinc, a) odour of chlorine is observed, , [1], , [1], b) the surface of the metal turns, shining, , c) the reaction mixture turns milky, , d) a colorless and odorless gas evolves, with bubbles., , 6., , Which of the following salt is used in lab to seal air gaps in apparatus so as to make the air, , [1], , tight arrangement?, , 7., , 8., , a), , CaS O4 . 2 H2 O, , b), , ZnS O4 . 7 H2 O, , c), , MgS O4 . 7 H2 O, , d), , CaS O4 ., , 1, 2, , H2 O, , Sodium carbonate is a basic salt because it is a salt of, a) Weak acid and strong base, , b) Weak acid and weak base, , c) Strong acid and weak base, , d) Strong acid and strong base, , Acetic acid was added to a solid X kept in a test tube. A colourless, odourless gas Y was, , [1], , [1], , evolved. The gas was passed through lime water, which turned milky. It was concluded that, , 9., , 10., , 11., , a) X is sodium bicarbonate and Y is SO2, , b) X is sodium bicarbonate and Y is CO2, , c) X is sodium acetate and Y is CO2, , d) X is sodium hydroxide and Y is CO2, , A scale for measuring hydrogen ion concentration in a solution is called, a) indicator scale, , b) pH scale, , c) acid scale, , d) alkaline scale, , Which of the following statements is true for acids?, a) Sour and change red litmus to blue, , b) Sour and change blue litmus to red, , c) Bitter and change red litmus to blue, , d) Bitter and change blue litmus to red, , Which is a base and not an alkali?, , Contact No. 9555561066, 9142935757, , [1], , [1], , [1], , 2/6

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12., , 13., , 14., , 15., , 16., , 17., , a) Fe(OH)3, , b) NH4OH, , c) NaOH, , d) KOH, , Which gas is liberated when HCl is added to a sample of solid Na2CO3?, a) Carbon dioxide, , b) Nitride, , c) Carbon monoxide, , d) Carbide, , Which one of the following types of medicines is used for treating indigestion?, a) Antacid, , b) Antiseptic, , c) Antibiotics, , d) Analgesic, , Name an indicator which indicates the various levels of hydrogen ion concentration., a) Universal indicator, , b) Phenolphthalein, , c) pH paper, , d) Litmus paper, , Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip, a) turned blue, , b) turned light pink, , c) did not change, , d) turned green and suddenly yellow, , Plaster of Paris hardens by, , [1], , [1], , [1], , [1], , [1], , a) Releasing out a molecule of water, , b) Changing into CaCO3, , c) Combining with water, , d) Passing of CO2 gas, , One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent, , [1], , is, , 18., , a) Acetic acid, , b) Sulphuric acid, , c) Tartaric acid, , d) Hydrochloric acid, , Dry HCl gas does not show acidic nature because, a) it is dry, , [1], , b) it does not ionize to form H+ and Cl−, ions, , c) it is a polar covalent compound, 19., , Identify the correct representation of reaction occurring during chloralkali process, a) 2NaCl (aq) + 2H2O(aq) → 2NaOH (aq), + Cl2 (g) + H2 (g), , [1], , b) 2NaCl (aq) + 2H2O(l) → 2NaOH(aq) +, Cl2 (aq) + H2 (aq), , c) 2NaCl (l) + 2H2O(l) → 2NaOH(l) + C12, (g) + H2 (g), 20., , d) it is a gas, , d) 2NaCl (aq) + 2H2O (l) → 2NaOH (aq), + Cl2 (g) + H2 (g), , As the pH value of solution increases from 7 to 14 , it represents, a) a decrease on the concentration of, OH– ions, , [1], , b) an increase in the concentration in, OH– ion, , c) no change in the concentration of, , d) an increase in the concentration of, , Contact No. 9555561066, 9142935757, , 3/6

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OH– ions, 21., , 22., , 23., , H3O+ ions., , The H+ ion concentration of a solution is 1.0 × 10-5 m. The solution is, a) Acidic, , b) Neutral, , c) Alkaline, , d) Amphoteric, , Washing soda is a, , [1], , a) acidic salt, , b) neutralized salt, , c) amphoteric salt, , d) basic salt, , During the electrolysis of NaCl, a) hydrogen gas at the anode and, chlorine gas at the cathode, c) hydrogen and chlorine gas at the, anode, , 24., , [1], , [1], b) chlorine and hydrogen gas at the, cathode, d) chlorine gas is formed at the anode, and hydrogen gas at the cathode., , Which of the following salts contains water of crystallization?, , [1], , A. Gypsum, B. Epsom salt, C. Blue vitriol, D. Glauber’s salt, , 25., , a) C and D, , b) A, B, C and D, , c) A and B, , d) B and D, , During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed, , [1], , through the guard tube containing calcium chloride. The role of calcium chloride taken in the, guard tube is to, , 26., , 27., , 28., , 29., , a) Absorb moisture from the gas, , b) Absorb the evolved gas, , c) Absorb Cl- ions from the evolved gas, , d) Moisten the gas, , The basic nature of sodium hydroxide (NaOH) is due to the presence of ________ in solution., a) Hydrogen ions, , b) Sodium ions, , c) Chloride ions, , d) Hydroxide ions, , Washing soda has the formula, , [1], , a) Na2CO3.7H2O, , b) Na2CO3, , c) Na2CO3.H2O, , d) Na2CO3.10H2O, , The most commonly used indicator in the laboratory is, a) Phenolphthalein, , b) Methyl Orange, , c) Universal Indicator, , d) Litmus, , What happens when two drops of phenolphthalein are added to a dilute solution of NaOH?, a) solution turns colourless, , [1], , [1], , [1], , b) solution turns red, , Contact No. 9555561066, 9142935757, , 4/6

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c) solution turns orange, 30., , d) solution turns pink, , Which one of the following solutions would you use to test the pH of a given sample?, a) Universal indicator solution, , b) Blue litmus solution, , c) Red litmus solution, , d) Mixture of red and blue litmus, , [1], , solution, 31., , Assertion (A): Weak acids have low electrical conductivity., , [1], , Reason (R): Strong acids and weak acid have an equal concentration of hydrogen ions in their, solutions., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 32., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): The acidity of Mg(OH)2 is two., , [1], , Reason (R): The acidity of a base is equal to the number of hydroxyl ions., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 33., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): HCl gas does not change the color of dry blue litmus paper., , [1], , Reason (R): HCl gas dissolves in the water present in wet litmus paper to form H+ ions., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 34., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): On adding H2SO4 to water the resulting aqueous solution gets corrosive., , [1], , Reason (R): Hydronium ions are responsible for corrosive action., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 35., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): While dissolving an acid or base in water, the acids must always be added, , [1], , slowly to water with constant stirring., Reason (R): Dissolving an acid on a base in water is a highly exothermic reaction., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 36., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): The Plaster of Paris is stored in moisture., , [1], , Reason(R): Plaster of Paris sets into a hard mass on wetting with water to form anhydrous, calcium sulphate., a) Both A and R are true and R is the, correct explanation of A., , b) Both A and R are true but R is not the, correct explanation of A., , Contact No. 9555561066, 9142935757, , 5/6

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c) A is true but R is false., 37., , d) A is false but R is true., , Assertion (A): If the pH inside the mouth decreases below 5.5, the decay of tooth enamel, , [1], , begins., Reason(R): The bacteria present in mouth degrades the sugar and leftover food particles and, produce acids that remains in the mouth after eating., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 38., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): During electrolysis of a concentrated aqueous solution of sodium chloride,, , [1], , hydrogen is produced at the anode and chlorine gas is produced at the cathode., Reason (R): Ions get attracted to oppositely charged electrodes., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 39., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): In water, Hydrochloric acid behaves as a weak monobasic acid., , [1], , Reason (R): In water, Hydrochloric acid acts as a proton donor., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., 40., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Assertion (A): The aqueous solution of glucose and alcohol does not show acidic character., , [1], , Reason (R): Aqueous solutions of glucose and alcohol do not give H+ ions., a) Both A and R are true and R is the, correct explanation of A., c) A is true but R is false., , b) Both A and R are true but R is not the, correct explanation of A., d) A is false but R is true., , Contact No. 9555561066, 9142935757, , 6/6