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MULTIPLE CHOICE QUESTIONS (MCQ) ON PRACTICAL SKILLS
1. Which one of the following solutions will tum blue litmus to red litmus?
(a) Lemon juice
(b) Acetic acid
(c) Hydrochloric acid
(d) Each one
2. Which one of the following solutions will not turn blue litmus to red litmus?
(a) Lemon juice
(b) Acetic acid
(c) Sodium hydroxide
(d) HCl
3. Which one of the following solutions will tum red litmus to blue litmus?
(a) Lemon juice
(b) Acetic acid
(c) Hydrochloric acid
(d) Sodium hydroxide
.
4. Which one of the following solutions with same concentrations has the lowest value of pH?
(a) Sodium bicarbonate
(b) Hydrochloric acid
\(c) Sodium hydroxide
(d) Ethanoic acid
5. Which one of the following solutions with same concentrations has the highest value of pH?
Ga)Sodium bicarbonate
(b) HCl
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(c) Sodium .hydroxide
(d) CH3COOH
6. which one is the correct method to find the plfof a solution?
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(c) II
(b) III
(d) I
CH3COOH
NaOH
(c) NaOf! HCl
CH}COOH
(d) CHJCOOH HCl
8. Which one is a suitable method to find the accurate pH value?
NaOH
NaOII
(a) pH meter
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7. The pH values of Hf.l, NaOH and CH3COOH of equal concentrations were measured using pH
papers. What is the correct increasing order of the pH values?
(a) HCl
nding
III
II
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CHjCOOII
(b) pH paper
(b) HCI
(c) Universal indicator
(d) Litmus solution
9. Which one is correct statement about universal indicator?
(a) It is a mixture of HCl and NaOH
(b) It is a mixture of many indicators
(c) It is a solution of phenolphthalein in alcohol
(d) It is a solution of phenolphthalein in water
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10. The pH values of distilled water, fruit juice and sodium bicarbonate were measured using pH
papers. What is the correct decreasing order of pH values?
(a) Water> Fruit juice> Sodium bicarbonate
(b) Sodium bicarbonate > Water > Fruit juice
(c) Fruit juice> Water> Sodium bicarbonate
(d) Water> Sodium bicarbonate> Fruit juice
11. When a drop of an unknown solution X is placed on a strip of pH paper, a deep red colour is .,
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produced. This sample is which one of the following?
(a) NaOH
(b) HCI
(c) Water
(d) CH3COOH
12. The pH of a sample Y is found to be 10. This sample may be which one of the following?
(a) NaOH
(b) HCl
(c) Water
(d) CH 3COOH
13. A student tests a sample of drinking water and reports its pH value as 6 at room temperature. Which
one of the following might have been added in water?
(a) Calcium chloride
(b) Sodium chloride
(c) Sodium bicarbonate
(d) Bleaching powder
14. Sometimes chlorine gas is passed through water for its purification. What is the pH value of such
a sample of water?
.
(a) Equal to 7
(b) More than 7
(c) Less than 7
(d) Very near to 8
15. When one drop of a sample is mixed with one drop of universal indicator a green colour is ;Jf
produced. The pH value of this sample is in which r a n g e ? i i
(a) 3 to 5
(b) 6 to 8
(c) 9 to 11
a
(d) 12 to 14
16. When one drop of a sample is mixed with one drop of universal indicator a red colour is produced. :~
The pH value of this sample will be in which range?
(a)4 to ,6
(b) 6 to 8
(c) 9 to 11
(d) 0 to 3
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17•.. Theplf of a sample of pure water is? at room temperature. What is its pH when a pinch of solid,
'sodium' bicarbonate is dissolved in it?;;:~- ... ,~-~."
(a) Very nearto 7
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(bY Less than.? .
. (c) More than 7
(d) Exactly 7
18. The pH of a solution of sodium hydroxide is 9. What will be its pH when more water is added to
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this solution?
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.
(a) Less than 9
(b) More than 9
(c) Equal to 9
(d) Equal to 10
19. The pH of a sample of hydrochloric acid is 3.5. What will be its pH when this solution is diluted
by adding water?
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(a) Less than 3.5
(b) Equal to 3.5
(c) More than 3.5
(d) Exactly 3
20. Four students a, b, c and d of class X measured the pH value of each one of the given samples of
distilled water, 0.1 M solution of ethanoic acid, 0.1 M solution of hydrochloric acid and 0.1 M
solution of sodium hydroxide using pH papers at 298 K. Tell which one of the following represents
a correct measurement?
one . ~~..Sqdi#fD;iJJd1~~~~:
1
1
1
1
13
1
13
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21. The chemicals in the Chemistry Lab should be used careful] y. TelJ what are the indications of the
symbols shown on the bottle of a chemical?
(a) Explosive and corrosive
(c) Flammable and corrosive
(b) Corrosive and flammable
(d) Flammable and oxidizing
22. Ethanoic acid, solution of sodium bicarbonate and distilled water are kept in three separate test
tubes marked as I, II and III respectively. A student finds the pH of each sample using pH paper.
What is the correct increasing order of their pH values?
(a) T, II, III
(b) I, III, II
(c) III, I, II
(d) III, II, I
23. The pH of which of the following samples cannot be found directly using pH paper?
(a) Lemon juice
(b) Dilute hydrochloric acid
(c) Solid sodium bicarbonate
(d) Solution of a detergent
24. Which one of the following is not required to fmd the pH of a solution..
\a) pH paper
(b) Litmus paper
.
-" (f) Universal indicator
(d) Standard value pH chart
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25. \lrop of a liquid sample was placed on a pH paper. The colour of the pH paper changed blue.
. ,irhe liquid sample may be which one of the following?
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1 (a) Lemon juice
(b) Hydrochlonc acid
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vapours formed
1 (b) Pour few
drops of solution from the test tube on the pH paper '
'(C) Drop the pH paper in 'the solution
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. (d) Put a drop of the solution on the pH paper using a dropper
to
ed
27. The pH value of a solution is in the range of 6 to 8. What is the colour developed when a student
adds 3 drops of universal indicator in the solution?
(a) Red
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(b) Blue
(c) Green
(d) Orange
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28. Four students (a), /(b), (c) and (d) measured the pH values of water, lemon juice and sodium
bicarbonate solution. What is the correct decreasing order of pH values?
(a) Water> Lemon juice> Sodium bicarbonate
(h) Lemon juice> Water> Sodium bicarbonate
(c) Sodium bicarbonate > Water )l Lemon juice
(d) Water> Sodium bicarbonate> Lemon juice
29. Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip
(a) 'umed blue
(b) did not change
(c) turned green and suddenly yellow
(d) turned light pink
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When a drop of ;'10 unknown solution X is placed .on a strip of pH paper, a deep blue colour is
produced. This sample should be which, one of the following?
(a) NaOH
(b) CH 3COOH
(c) Water
(d) HCl
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31. row drops of red litmus solution were added to each one of the following samples. Which one turns
red litmus solution blue?
(a) Alcohol
(b) Distilled water
(c) Sodium hydroxide solution
(d) Hydrochloric acid
32. A few drops of dilute hydrochloric acid are placed on a strip of pH paper. The colour of the pH '
paper turns to
(a) dark pink
(b) light green
(c) light blue
(d) light yellow
33. A colourless sample was tested with a strip of pH paper. The colour of the strip changed to reddish
pink. The sample should be
(a) tap water
(b) distilled water
(c) sodium hydroxide
(d) lemon juice
34. On introducing a strip of pH paper in 1.0 mL of the green solution, the pH paper changed to light
red. The given solution would be of
(a) sodium hydroxide
(b) sodium bicarbonate
(d) ethanoic acid
(c) a mixture of sodium hydroxide and sodium bicarbonate
35. A student takes a solution of dilute hydrochloric acid in a
test tube and adds a few drops of universal indicator in to it
as shown in the figure. He would observe that the colour of
the solution changes from colourless to
(a) Green
(b) Red
, (c) Yellow
(d) Violet
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Dropper
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Drops of universal
indicator
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Dilute Hel
36. On adding a few drops of universal indicator J three colourless solutions taken separately in three'
test tubes labelled P, Q, and R respectively, the colours developed in the solutions are marked in:
the following figures.
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•
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f-+--- universal;'
indicator
Drops of
----t-"--- universal
'indieator
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,,~t---- Drops on
universal ,',
indicator '"
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(Green)
(Red)
(Violet)
What is the correct decreasing order of the pH values of theses solutions?
(a) P> Q> R
(b) Q > P > R
(c) R> Q > P
(d) R > P > Q
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1. (d)
6. (a)
11. (b)
16. (d)
21. (c)
26. (d)
31. (c)
36. (d)
2. (c)
7. (b)
12. (a)
17. (c)
22. (b) ,
27. (c)
32. (a)
3. (d)
8. (a)
13. (d)
18. (a)
23. (c)
28. (c)
33. (d)
4.
9.
14.
19.
(b)
(b)
(c)
(c)
24. (b)
29. (b)
34. (d) ,
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5. (c)
10. (b)
15. (b)
20. (d)
25. (c)
30. (a)
35. (b)
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