GRADE: 10 CHEMISTRY MCQ (TERM-1)

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1 GRADE: 10 CHEMISTRY MCQ (TERM-1) 1 When ferrous sulphate crystals are heated, the colour of the residue formed is : (a) red (b) brown (c) orange (d) green. 2 A small amount of quick lime is taken in a beaker. Water is added slowly to the beaker. Which of the following observations were noted? (a) Hissing sound and the solution becomes hot. (b) No characteristic sound and solution turns cold (c) Hissing sound and the solution becomes cold. (d) No characteristic sound and the solution become hot. 3 The colour of ph strip turned red when it was dipped in a sample. The sample could be : (a) dilute NaOH solution (b) tap water (c) dilute HCl solution (d) dilute NaHCO 3 solution. 4 The correct method of finding ph of solution is to : (a) heat the solution in the test tube and expose the ph paper to the vapours formed. (b) pour solution from the test tube on ph paper (c) drop the ph paper into the solution. (d) add a drop of solution on the ph paper using a dropper ml of HCl and 10 ml of NaOH solutions are taken in two separate beakers labelled I and II respectively. On adding Zinc granules to both, it is observed that at room temperature (a) Gas is evolved vigorously in both. (b) Gas is evolved vigorously in beaker I and not in the beaker II. (c) Gas is evolved vigorously in beaker II but not in the beaker I. (d) No gas is evolved in either of the two beakers. 6 A new iron nail is placed in a beaker containing aqueous copper sulphate solution. When the nail is taken out after 15 minutes, its surface is coated with: (a) reddish deposit (b) greenish deposit (c) black deposit (d) white deposit. 7 A piece of granulated Zn was dropped into copper sulphate solution. After some time the colour of solution changed from: (a) light green to blue (b) blue to colourless (c) light green to colourless (d) blue to green. 8 When iron nails are kept in copper sulphate solution for 30 minutes, the colour of solution changes into: (a) red (b) pink (c) orange (d) light Page 1 of 11

2 green 9 The colour of the precipitate formed when barium chloride solution reacts with sodium sulphate solution is: (a) yellow (b) orange (c) green (d) white 10 A student adds a few drops of universal indicator to a solution and observes colour changes to orange. The solution would be: (a) strong acid (b) strong base (c) weak acid (d) weak base 11 Observe the following figures and choose the correct option. (a) ph of I is greater than of II and III (b) ph of IV is less than of I and II (c) ph of IV is greater than of I, II and III (d) ph of I is less than of III of and IV 12 When hydrochloric acid reacts with zinc: (a) surface of zinc becomes white. (b) surface of zinc becomes black and dull. (c) zinc becomes powder. (d) the reaction mixture turns red. 13 Freshly prepared iron sulphate solution was taken in each of four test tubes. Strips of Cu, Fe, Zn and Al were introduced in different test tubes, a black residue was observed in two test tubes. The pair of metals forming the residue is: (a) Cu and Zn (b) Al and Cu (c) Fe and Al (d) Zn and Al 14 A student added a piece of zinc metal to four test tubes I, II, III, IV which respectively contain aqueous solution of aluminium sulphate, zinc sulphate, ferrous sulphate and copper sulphate. In which solution he observed that the reaction has taken place. (a) I, II (b) II, III (c) III, IV (d) I, IV 15 Aluminum strip was placed in a solution of copper sulphate. After one hour, it was observed that the colour of solution changes. The colour of solution would become. (a) light green (b) colourless (c) dark brown (d) deep blue ml of freshly prepared iron sulphate solution was taken in each of four test tubes I, II, III and IV. Strips of copper, iron, zinc and aluminium were respectively introduced in the test tubes I, II, III, and IV. A black residue was obtained in two of them. These test tubes are : Page 2 of 11

3 (a) I, III (b) I, IV (c) II, IV (d) III, IV 17 A student dipped strip of ph paper in solutions taken in beakers A and B. The colour of strip changed to red in breaker A and green in breaker B. The samples in A and B respectively are: (a) HCl, water (b) HCl, lemon juice (c) lemon juice, HCl (d) water, HCl 18 Bottle X contains NaOH solution and bottle Y contains distilled water. On dipping ph paper strips in each of the solutions, the colour seen in X and Y respectively are: (a) blue, red (b) blue, green (c) green, blue (d) red, blue 19 Which one of the following substances will be required to identify the gas evolved, when dil. HCl reacts with solid sodium carbonate? (a) red litmus solution (b) lime water (c) blue litmus solution (d) zinc granules ml of freshly prepared iron sulphate solution was taken in each of four test tubes I, II, III and IV. Strips of copper, iron, zinc and aluminium were respectively introduced in the test tubes I, II, III, and IV. A black residue was obtained in two of them. These test tubes are : (a) I, III (b) I, IV (c) II, IV (d) III, IV 21 In an experiment each of the metals Al, Zn, Cu and Fe are reacted with ZnSO 4, CuSO 4, Al 2 (SO 4 ) 3 and FeSO 4, solutions. The results are tabulated as follows where means that the reaction occurs and Х means no reaction occurs. On the basis of the above result the order of the reactivity of the metals may be Page 3 of 11

4 concluded as: (a) Zn > Fe > Al > Cu (b) Al > Fe > Zn > Cu (c) Zn > Al > Fe > Cu (d) Al > Zn > Fe > Cu 22 Some iron nails were dropped in an unknown solution taken in a beaker and left for 10 minutes. It was then observed that a brown coating is formed on nails. The solution is of: (a) Al 2 (SO4) 3 (b) Cu SO 4 (c) Fe SO 4 (d) ZnSO 4 23 Bottle A contains acetic acid and bottle B contains sodium carbonate solution. When ph paper is dipped in each of the solution, the colour seen in A and B respectively will be: (a) blue, orange (b) orange, green (c) orange, blue (d) green, blue 24 On adding a few drops of universal indicator to three unknown colourless solutions (X), (Y) and (Z) taken separately in three test tubes shown in the following diagrams, a student observed the changes in colour as green in (X), red in (Y) and violet in (Z). Arrangement of solution in the decreasing order of ph is: (a) X, Y, Z (b) Z, X, Y (c) Y, X, Z (d) Z, Y, X ml of HCl and 10 ml of NaOH solutions are contained in two separate beakers labeled I and II respectively. On adding zinc granules to both, it is observed that at room temperature: (a) gas is evolved in beaker II but not in beaker I b) no gas is evolved in either of the two beakers c) gas is evolved vigorously in both. (d) gas is evolved vigorously in beaker I but not so in beaker II. 26 Solutions of ferrous sulphate, zinc sulphate, copper sulphate and aluminium sulphate were separately taken in four test tubes and some iron nails were placed in each of the solutions. After few minutes, it would be observed that the colour of: (a) Solutions of zinc sulphate, copper sulphate and aluminium sulphate changed and that of ferrous sulphate did not change. Page 4 of 11

5 (b) Solutions of zinc sulphate and aluminium sulphate only changed. (c) Copper sulphate solution only changed. (d) All the four solutions changed 27 Four test tubes containing solutions are shown along with colours. FeSO 4 is contained in : (a) (II) (b) III (c) I (d) IV 28 During the experiment of heating of Ferrous sulphate crystals, four students recorded their observations as : (i) green colour, of crystals changes to brown black colour (ii) brownish yellow gas is evolved (iii) blue colour of crystals changes to green colour (iv) smell of burning sulphur is felt Which of the above observations are correct? (a) (i), (ii) (b) (i), (iv) (c) (ii), (iii) (d) (iii), (iv) 29 An iron nail is placed in a solution of copper sulphate. The nail is taken out after 10 minutes. The nail will be found to be covered with: (a) brown deposit (b) black deposit (c) white deposit (d) gray deposit 30 A dilute solution of sodium bicarbonate is taken in a test tube and a few drops of the universal indicator is added to it. The colour observed will be: (a) blue (b) yellow (c) orange (d) green 31 A student dips ph papers in solution X and Y and observes that the ph paper turns blue and orange respectively in them. He infers that: (a) X is HCl solution, Y is NaOH solution. Page 5 of 11

6 (b) X is acetic acid, Y is sodium carbonate solution (c) X is sodium carbonate solution, Y is acetic acid. (d) X is oxalic acid, Y is sodium carbonate solution 32 On bringing a lighted match stick near the mouth of the test tube in which NaOH and Zn react: (a) the matchstick gets extinguished (b) the matchstick burns faster (c) a pop sound is heard (d) no effect is observed on matchstick. 33 Four test tubes containing solution of different colour marked I, II, III and IV are shown below. The test tubes containing copper sulphate solution and Ferrous sulphate solution, could be the tubes : (a) I and II (b) II and III (c) III and IV (d) II and IV 34 An iron nail was kept immersed in aluminium sulphate solution. After about an hour, it was observed that: (a) the solution becomes warm (b) the colourless solution changes to light green (c) the solution remains colourless and no deposition is observed on iron nail. (d) grey coloured deposit form on iron nail. 35 On heating Ferrous Sulphate crystals, one would get- (a) Sweet smell (b) rotten egg smell (c) Irritating choking smell (d) no smell 36 Four students were asked to study the reaction between aqueous solutions Barium chloride and Sodium sulphate. They reported their experiment as follows. On mixing the solutions of the two salts in a test tube (i) The colour of the mixture becomes brown. (ii) The solutions form separate layer (iii) a colourless mixture is obtained. (iv) a white substance settles at the bottom. The correct report is: (a) i (b) (ii) (c) (iii) (d) iv 37 A student observed that the colour of ph paper changed to green when he dipped it in water, He added a few drops of concentrated hydrochloric acid to the water. The Page 6 of 11

7 colour of P H : (a) will remain green (b) will become blue (c) will become red (d) will become yellow 38 On putting few drops of an unknown liquid on the ph strip, the colour of the ph strip changed to violet. The liquid taken is likely to be: (a) dilute sodium hydroxide (b) dilute hydrochloric acid (c) dilute acetic acid (d) Water 39 Two test tubes containing 2 ml of dilute HCl are taken. Zinc granules are added to test tube (A) and solid sodium carbonate is added to test tube (B) as shown The correct observation would be :- (a) Slow reaction in (A) and rapid reaction in (B) (b) Rapid reaction in (A) but a slow reaction in(b) (c) Rapid reaction in both the test tubes. (d) No reaction in any of the test tubes. 40 Rahul added some zinc granules to freshly prepared Ferrous sulphate solution. He observed that on the granules : (a) a dull brown coating is formed (b) a black coating is formed. (c) a grayish coating is formed (d) no coating is formed 41 When an Aluminium strip is kept immersed in freshly prepared Ferrous sulphate solution taken in a test tube, the change which is observed is :- (a) the green solution turns brown. (b) the lower end of the test tube becomes slightly warm. Page 7 of 11

8 (c) a colourless gas with smell of burning sulphur is observed. (d) light green solution changes to blue. 42 Four groups of students were assigned separately the experiment of interaction of iron nails with a solution of copper sulphate. Each group recorded the observations as given below in the table. Which group of students recorded all the observations correctly? 43 Which of the following is a correct observation when water is added to quick lime? (a) Vigorous bubbling and a hissing sound (b) Slow bubbling with no sound (c) Vigorous bubbling with evolution of heat and a hissing sound. (d) No change and a hissing sound. 44 On introducing a strip of ph paper in the given solution, the ph paper changed to light red. The given solution could be of: (a) sodium hydroxide (b) sodium bicarbonate (c) a mixture of sodium hydroxide and sodium bicarbonate. (d) ethanoic acid. 45 The correct method to find the ph of a solution is : 46 The figures below show set ups for studying the reaction of zinc with sodium hydroxide Page 8 of 11

9 The correct set up is: (a) I (b) II (c) III (d) IV 47 Iron nails were dipped in a solution kept in a test tube. After half an hour, it was observed that the colour of the solution had changed. The solution in the test tube was that of: (a) Zinc sulphate (b) Iron sulphate (c) Copper sulphate (d) Aluminium sulphate 48 Two beakers A and B contain Iron (II) sulphate solution. In the beaker A is placed a small piece of copper and in the beaker B is placed a small piece of zinc. It is found that a grey deposit forms on the zinc but not on the copper. From these observations it can be concluded that: (a) zinc is most active metal followed by iron and copper. (b) zinc is most active metal followed by copper and then Iron. (c) Iron is most active metal followed by zinc and then copper. (d) Iron is most active metal followed by copper and then zinc. 49 On mixing solutions of Barium chloride and sodium sulphate a white precipitate is obtained. This reaction can be categorized as: (a) Combination reaction. (b) Decomposition reaction. (c) Double displacement reaction. (d) Displacement reaction 50 Four students in a class were asked to observe the effect of heating ferrous sulphate crystals. They started heating ferrous sulphate in a test tube. The teacher stopped three of them for adopting a wrong procedure for heating. Which of the following set - ups shows a correct way of heating? Page 9 of 11

10 (a) a (b)b (c)(c (d) d 51 A student has four samples A, B, C and D containing dil.hcl, aq KCl, dil. NaOH and distilled water respectively. The solutions with equal ph are : (a) A and B (b) B and C (c) C and D (d) B and D 52 Four students measured the ph values of water, lemon juice and sodium bicarbonate solution. Correct sequence of solutions in decreasing order of ph value would be: (a) water, lemon juice, sodium bicarbonate. (b) lemon juice, water, sodium bicarbonate. (c) sodium bicarbonate, water lemon juice. (d) water, sodium bicarbonate, lemon juice 53 A solution in test tube A turns red litmus blue, evolves hydrogen on reaction with Zn and does not react with sodium carbonate, whereas solution in test tube B turns blue litmus red, liberates hydrogen on reaction with Zn and CO2 with Na2CO3. Solution taken in A and B are: (a) acid in A base in B (b) base in A acid in B. (c) base in both A and B (d) Acid in both A and B 54 Four strips labelled A, B, C and D along with their corresponding colours is shown below. Which of these could be made up of Aluminium? (a) A (b) B (c) C (d) D 55 Students in a lab were assigned the experiment to study the reaction of Zn with FeSO 4 solution. The following set of observations was made. Identify the set where all observations were correct. Page 10 of 11

11 56 When ferrous sulphate crystals are heated in a test tube, we observe: (a) a colourless gas with no smell is evolved. b) a brown gas is evolved. (c) green colour of the salt fades and a gas with the smell of burning sulphur is evolved. (d) green color of the salt fades and no gas is evolved. 57 The reaction between iron nails and copper sulphate solution is: (a) decomposition reaction. (b) double displacement reaction. (c) displacement reaction. (d) combination reaction. 58 Bottle A contains aqueous solutions of sodium bicarbonate and bottle B contains water. When ph solution is added to each of the solutions, the colour of solutions observed in A and B respectively are: (a) blue and green. (b) green and yellow. (c) yellow and green. (d) green and blue. 59 ph values of four solutions A, B, C and D are 7, 8, 9, 10 respectively. Put them in a sequence according to their nature: (a) acidic, acidic, neutral, basic. (b) acidic, neutral, basic, basic. (c) acidic, acidic, acidic, neutral. (d) neutral, basic, basic, basic. 60 A base is a substance which shows the following set of properties: (a) sour taste, produces hydrogen gas when reacted with a metal and change colour of red litmus to blue. (b) bitter to taste, produces hydrogen gas when reacted with a metal and changes colour of blue litmus to red. (c) sour to taste, produces hydrogen gas when reacted with a metal and changes colour of blue litmus to red. (d) bitter to taste, produces hydrogen gas when reacted with a metal and changes colour of red litmus to blue. Page 11 of 11