Grade 10- Practical skills- MCQ- SA1CODE-060

On heating ferrous sulphate in a test tube it undergoes.(a) Combination reaction.(b) Decomposition reaction.(c) Displacement reaction.(d) Double displacement reaction.When a cleaned iron nail is placed in copper sulphate solution, the colour of solution changes to(a) blue (b) red (c) pale violet (d) pale greenOn introducing a strip of pH in 1.0 mL of the given solution, the pH paper changed to light red. The given solution could be(a) Sodium hydroxide(b) Sodium bicarbonate(c) Ethanoic acid(d) A mixture of sodium hydroxide and sodium bicarbonateA drop of a liquid is poured on a pH paper, such that the colour of pH paper changes to green. The pH of the liquid is(a) 7 (b) 9 (c) 5 (d) 4A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the colour of the litmus paper.(a) Changed to red. (b) Changed first to red and then to blue.(c) Changed blue to colourless. (d) Remained blue in both the solution.Which one of the following will not be observed when Zinc pieces are added to a solution of copper sulphate?(a) The solution is blue in the beginning.(b) The solution in the test tube becomes pale green after some time.(c) A reddish brown mass is deposits on the surface of zinc.(d) The final solution becomes colourless.A strip of copper was placed in a beaker containing zinc sulphate solution. On observing the strip the next day, it was noticed that.(a) The copper strip remained as it was.(b) The copper strip became thinner.(c) The copper strip became thicker.(d) The colour of the solution in the beaker changed to blue.

CODE-061When we mix aqueous solution of barium chloride to aqueous solution of sodium sulphate we observe that(a) a white precipitate is formed almost immediately(b) a white precipitate is formed after some time(c) a colourless and odourless gas is evolved(d) a yellow precipitate is formed after sometimeA student dissolves some crystals of CuSO4 in distilled water. The colour of the solution obtained would be(a) Dark green (b) Pale Green(c) Blue (d) BrownA student determines the pH value of a sample of fruit juice between 2.5 and 3.6. He may conclude that the fruit juice is(a) Acidic (b) Highly acidic(c) Neutral (d) AlkalineA drop of liquid is poured on a pH paper such that the colour of pH paper changes to green the liquid is

(a) Dilute hydrogen chloride solution(b) Dilute sodium hydroxide solution(c) Sodium chloride solution in distilled water(d) Ammonium chloride solution in waterWhen dilute HCl acid is added to granulated zinc placed in a test tube, The observation made is(a) The surface of the metal turns shiny(b) The reaction mixture turns milky(c) Odour of chlorine is observed(d) A colourless and odourless gas evolvedA thin plate of zinc was placed in a beaker containing aqueous ferrous sulphate solution . When the zinc plate was taken out of the ferrous sulphate solution after about 30 minutes, on observation it was noticed that is surface is coated with a substance which appear(a) Blue (b) Grey(c) Reddish brown (d) BlackSolutions of CuSO4, FeSO4, Zn SO4 and Al2 (SO4)3 were separately taken in four test tubes and some pieces of iron were dipped in each of the four solutions. After about 15 minutes it was observed that the colour of(a) All the four solutions changed (b) Solution of ZnSO4, CuSO4 and Al2 (SO4)3 changed and that of FeSO4 did not change (c) Solution of ZnSO4 and Al2 (SO4)3 only changed (d) Solution of Cu SO4 only change

CODE-062A student was asked by his teacher to heat some of ferrous sulphate in a boiling tube. The type of reaction he performed was -(a) Combination reaction (b) Decomposition reaction(c) Displacement reaction (d) Double displacement reactionA student took some dry quick lime in a Petri dish and added a small amount of water to it. He immediately heard a sound which was :(a) a popping sound (b) a crackling sound.(c) a hissing sound (d) a crashing sound.Mihir dipped a pH paper first in distilled water and then in the dilute solution of lemon juice. He found that the colour of pH paper has changed from.(a) Indigo to orange. (b) Green to blue.(c) Green to orange (d) Indigo to greenA student added few drops of the universal indicator to a dilute hydrochloric acid solution as shown in the diagram.

He observed that the colour of the solution changed from colourless to(a) Yellow (b) Red (c) Green (d) Violet.On adding a drop of red litmus solution to an aqueous solution of sodium carbonate the colour of red litmus solution changes to blue. On the basis of this observation the nature of the solution should be –(a) alkaline (b) acidic.(c) neutral (d) highly acidicA group of students performed an activity in laboratory. They dipped an iron nail in an aqueous solution of copper sulphate. After one hour they observed that the colour of the solution changed from.

(a) blue to pale green (b) green to blue.(c) blue to colourless (d) colourless to pale green.On adding Zn granules to freshly prepared ferrous sulphate solution, a student observed that after some time a coating is formed on the zinc granules which is(a) dull brown (b) greyish.(c) black (d) reddish brown

CODE-063The precipitate formed when aqueous solutions of Sodium Sulphate and Barium Chloride are mixed is of :(a) Barium sulphide (b) Sodium sulphide.(c) Sodium chloride (d) Barium sulphateWhen we dip an iron strip in aqueous solution of CuSO4 the blue colour of the solution is gradually changed to pale green. The reaction represents :(a) Decomposition reaction (b) Combination reaction(b) Displacement reaction (d) Double displacement reaction.Two colours seen at the extreme ends of a pH chart are:(a) Red and green (b) Green and blue.(c) Red and orange (d) Red and blue.A student tested the pH of distilled water and found that the colour of pH paper changed to green and when he checked the pH again after dissolving a pinch of common salt in it , the colour of pH paper this time was:(a) yellow (b) red (c) green (d) blue.Zn metal in the laboratory for doing experiments is available in the form of :(a) filings (b) turnings (c) granules (d) pelletsWhen an iron strip is dipped in aqueous solution of zinc sulphate, the solution after 15 minutes appears:(a) light blue (b) pale green (c) colourless (d) light pink.An iron nail is placed in a beaker containing copper sulphate solution. After 15 minutes a deposit is formed on the iron nail. The colour of the deposit on the nail and that of the solution respectively are :(a) blue and pale green. (b) reddish brown and blue.(c) reddish brown and pale green. (d) blue and reddish brown.

CODE-064The colour of precipitate formed when aqueous solution of sodium sulphate is added to the aqueous solution barium chloride is: (a) Yellow (b) White (c) Green (d) OrangeThe colour change observed when the ferrous sulphate crystals are heated in a dry boiling tube is(a) Green → orange → brown. (b) Green→ white → brown.(c) Blue→ green→ white. (d) Green→ brown → black.The substance used to determine the pH of a solution is(a) Litmus solution (b) Methyl orange solution.(c) Universal indicator (d) Turmeric solutionWhen pH paper strip was dipped in sodium bicarbonate solution, the colour of the strip :(a) turned blue (b) did not change.(c) turned green (d) turned light pinkWhich of the following is observed when dilute hydrochloric acid is added to solid sodium carbonate?(a) No change takes place (b) A loud sound is produced. (c) The solution turns blue (d) Brisk effervescence occursWhen an aluminium foil is placed in zinc sulphate solution and taken out after some time it is observed that the surface of aluminium foil is coated with:(a) a blue deposit (b) a white deposit.(c) a silvery grey deposit (d) a black deposit.When you place a zinc plate in copper sulphate solution you observe a reddish brown coating formed on the zinc plate. This coating is:(a) Soft and dull (b) Smooth and shiny.(c) Hard and flaky (d) Rough and granular

CODE-066An iron nail was suspended in copper sulphate solution and kept for a while. The solution:(a) remained blue and a coating was found on the nail.(b) remained blue and no coating was found on the nail

(c) turned pale green and a coating was found on the nail(d) turned pale green and no coating was found on the nail.On adding quick lime to water in a beaker a student would observe that the type of reaction is:(a) combination and exothermic(b) combination and endothermic(c) decomposition and exothermic(d) decomposition and endothermicA student observed that the colour of pH paper changed to green when she dipped in water. She added a few drops of concentrated hydrochloric acid to the water. The colour of pH paper would turn to :(a) light red (b) apple green.(c) dark blue (d) lemon yellow.A student was given three test tubes I, II, and III containing ethanoic acid, sodium bicarbonate solution and water respectively. On dipping a pH paper in them, he observed that the colour turned orange in I, blue in II and green in III. If arranged in increasing order of their pH, the sequence of three test tubes should be:(a) I, II, III (b) II, III, I (c) III, I, II (d) I, III, IIThe figures below show set ups for studying the reaction of Zinc with sodium hydroxide.

(a) I (b) II (c) II (d) IVTwo 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 is formed on the Zinc but not on the copper. From these observation it can be concluded :(a) zinc is most reactive metal followed by iron and then copper.(b) zinc is most reactive metal followed by copper and then iron.(c) iron is most reactive metal followed by zinc and then copper.(d) iron is most reactive metal followed by iron and then zinc.A student put four big iron nails, one each in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed. Only on the surface of one iron nail that was put in the solution of :(a) Zinc sulphate. (b) Aluminium sulphate.(c) Copper sulphate (d) Iron sulphate.

CODE-067On adding quick lime to water we observe:(a) evolution of heat, vigorous bubbling and hissing sound.(b) slow bubbling with no sound.(c) no change in temperature but a hissing sound.(d) change in temperature but no wising sound.When we heat ferrous sulphate crystals a gas evolves which has a smell of: (i) rotten eggs (ii) pleasant smell (iii) irritating smell (iv) burning sulphurFour students were asked to test the pH of four samples as shown. Whose result is reported correctly?

The colours obtained on a pH paper for a highly acidic, basic and neutral solutions respectively are:(a) blue, orange, green. (b) yellow, blue, green.(c) red, blue, green. (d) red, green, blue.Rahul took some zinc granules in a test tube and added dilute HCl to it. He observed that the colour of the zinc granules changed to:(a) yellow (b) brown (c) black (d) white.Iron filings were added to an aqueous solution of copper sulphate. After sometime on observation it was found that the colour of the solution has changed from:(a) blue to pale green (b) blue to dark green,(c) blue to colourless (d) blue to reddish brown.When an iron nail, rubbed with sand paper, is dipped in copper sulphate solution, we observe that copper gets deposited.(a) first on the lower part of the nail and proceeds to the upper part.b) first on the upper part of the nail and proceeds to the lower part.c) on the entire surface of the nail(d) on the nail in small patches.

CODE-068When sodium sulphate solution is added to barium chloride solution(a) brown precipitate appears after sometimes. (b) red precipitate appears almost instantaneously.(c) white precipitate appears immediately. (d) the solution turns pink.The coating which is observed on iron metal when it is kept immersed in a solution of copper sulphate appears(a) reddish brown (b) grey (c) green (d) blackOn adding a few drops of universal indicators to three unknown colourless solutions (P), (Q), and (R) taken separately in three test tubes shown in the following diagrams, a student observed the changes in colour as green in (P), red in (Q) and violet in (R).

The decreasing order of pH of the solutions taken is:(a) P > Q > R (b) R > P > Q (c) Q > P > R (d) R > Q > PWhich of the following will turn pH paper to red?(a) Milk of Magnesia (b) Baking soda(c) Oxalic acid solution (d) NaCl solutionRahul took some zinc granules in a test tube and added dilute HCl to it. He observed that the colour of the zinc granules changed to:(a) yellow (b) brown (c) black (d) whiteSolutions of ferrous sulphate, zinc sulphate, copper sulphate and aluminium sulphate were separately taken in four

test tubes and a few iron filings were added to each of the solutions. After few minutes, it was observed that the colour of :(a) all the four solutions changed(b) solutions of zinc sulphate and aluminium sulphate only changed(c) solutions of zinc sulphate, copper sulphate and aluminium sulphate changed and that of ferrous sulphate did not change(d) copper sulphate solution only changedA student added zinc granules to copper sulphate solution taken in a test tube. Out of the following the correct observation (s) make by the student wereI. Zinc granules have silvery grey colour. II. Zinc granules have no regular shape.III. The colour of zinc granules changed to brownish black.(a) I only (b) II only (c) I, II, and III (d) III only

CODE-069Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that the color of the solution changes and a layer gets deposited on iron filings. The color of the solution and that of the coating would, respectively, be:(a) yellow and green(b) brown and pale green(c) red and greenish blue(d) pale green and reddish brownStudents were asked to study the reaction between barium chloride and sodium sulphate. Four different reports of the experiment are given below.

The correct report was (a) A (b) B (c) C (d) DFour students (a), (b), (c) and (d) measured the pH value of water, lemon juice, and sodium bicarbonate solution. What is the correct decreasing order of the pH values?(a) water>lemon juice>sodium bicarbonate(b) lemon juice>water>sodium bicarbonate(c) sodium bicarbonate > water > lemon juice(d) water > sodium bicarbonate > lemon juiceIn an experiment to test the pH, of a given sample using pH Paper, four students recorded the following observations:

Which one of the following students recorded incorrect observations?(a) I (b) II (c) III (d) IVWhen a student added zinc granules in dilute HCl, a colorless and odourless gas was evolved. On testing with a

burning match stick it was observed that the match stick:(a) continued to burn brilliantly(b) burnt slowly with a blue flame(c) extinguished and gas burnt with pop sound(d) continued to burn brilliantly and gas burnt with pop sound.To show that zinc is more reactive than copper, the correct procedure is to(a) prepare zinc sulphate solution and dip copper in it(b) heat zinc and copper strips(c) prepare copper sulphate solution and dip zinc strip in it(d) prepare ferrous sulphate solution and dip both the strips in it.A zinc granule was placed in a beaker containing copper sulphate solution. On observing the granule the next day, it was noticed that(a) the zinc granule remained as it was(b) the colour of the granule changed(c) the zinc granule became thinner(d) the zinc granule became thicker

CODE-073A clean iron nail is placed in a beaker containing aqueous copper sulphate solution. The nail is taken out after an hour. The colour of copper sulphate solution changes to :(a) Pale green.(b) Light Blue (c) Deep green.(d) Almost colourless.What happens when ferrous sulphate crystals are heated?(a) No gas is evolved.(b) Brown coloured gas is evolved.(c) A gas having smell of burning sulphur is evolved.(d) Red coloured gas is evolved.A pH paper is first dipped in distilled water and then in dilute solution of lemon juice. The colour of pH paper changes from colourless.(a) colourless to green. (b) indigo to orange.(c) green to pink (d) green to orange.On adding a few drops of universal indicator to three unknown colourless solutions P, Q and R taken separately in three test – tubes as shown in the following diagrams, a student observed the changes in colour as green in (P), red in (Q) and violet in (R). The decreasing order of pH of the solutions taken is :

(a) P > Q > R(b) R >P > Q(c) Q > P > R(d) R > Q > PWhen a student added zinc granules to dilute HCl, a colourless and odourless gas was evolved, which was then tested with a burning match stick ; it was observed that the match stick(a) continued to burn brightly.(b) burnt slowly with a blue flame.(c) extinguished.(d) burnt with pop sound.Zinc pieces were placed in each of the four test tubes containing different salt solutions as shown below:

A colour change would be observed in solutions(a) I and II(b) I and III(c) III and IV(d) I and IVIron nails were dipped in a solution kept in a test – tube. After an hour, it was observed that the colour of the solution had changed. The solution in the test – tube that of(a) aluminum sulphate (b) copper sulphate(c) iron sulphate (d) zinc sulphate

CODE-075The chemical reaction between barium chloride solution and sodium sulphate solution is an example of :(a) decomposition reaction (b) combination reaction(c) displacement reaction (d) double displacement reactionAn iron nail was placed in a test tube containing aqueous copper sulphate solution. When the nail is taken out after about half an hour, its surface is coated with :(a) greenish deposit (b) white deposit.(c) reddish brown deposit (d) black depositA student determined the pH of the given four samples using pH paper.Sodium bicarbonate Hydrochloric acid Lemon juice Distilled water I II III IVThe pH paper will turn red/pink with the following:(a) I and II only (b) II and III only.(c) I, II, III, IV (d) IV only.A few drops of a liquid ‘A’ were added to distilled water. The water now turned pH paper blue. The liquid ‘A’ is –(a) lemon juice (b) sodium hydroxide solution(c) common salt solution (d) hydrochloric acidA pinch of sodium carbonate was added to two test tubes – one containing dil HCl (A) and the other containing dilute NaOH (B). The correct observation was(a) A brown coloured gas liberated in test tube A. (b) A brown coloured gas liberated in test tube B.(c) A colourless gas liberated in test tube A. (d) A colourless gas liberated in test tube B.Zinc granules are placed in each of the four solutions I, II, III and IV as shown:

The colour change would be observed in :(a) I and II (B) II and III. (c) III and IV (d) I and IV.Uma took an aluminium strip and dipped it in freshly prepared ferrous sulphate solution taken in a test tube. After some time, she observed some changes. One of her correct observations is :(a) The green solution remained green.(b) A black coating deposited on the aluminium strip.

(c) A brown gas is evolved. (d) A colourless gas with smell of burning sulphur is evolved.

CODE-076The colour of the precipitate formed when barium chloride solution is mixed with sodium sulphate solution is : (a) blue (b) black (c) white (d) greenA student heated small amount of ferrous sulphate in a test tube. She made the following observations.(i) colour of Ferrous sulphate changes to brown. (ii) A gas having a smell of burning sulphur is evolved (iii) Water droplets collect on the upper side of the test tube. (iv) Brown coloured gas is evolved The correct set of observations is: (a) (i), (ii), (iv) (b) (i) (ii) (iii) (c) (i), (iii), (iv) (d) (ii), (iii), (iv)A drop of a liquid sample was put on the pH paper. It was observed that the colour of the pH paper turned blue. The liquid sample is: (a) lemon juice (b) sodium bicarbonate solution (c) distilled water (d) hydrochloric acid.Two solutions X and Y were found to have pH value of 4 and 10 respectively. The inference that can be drawn is : (a) X is a base and Y is an acid (b) Both X and Y are acidic solutions. (c) X is an acid and Y is a base (d) Both X and Y are basesWhich one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal?(a) red litmus solution (b) blue litmus solution (c) a burning splinter / match stick (d) lime water.An iron nail was suspended in copper sulphate solution. After about one hour it was observed that the solution.(a) remained blue and a reddish brown coating was formed on the nail(b) remained blue and no coating was formed on the nail(c) turned pale green and a reddish brown coating was formed on the nail(d) turned pale green and no coating was formed on the nailFreshly prepared aqueous solutions of ferrous sulphate and zinc sulphate respectively appear:(a) pale green and colourless (b) blue and colourless (c) colourless and pale green (d) pale green and light blue