Acids Bases and Salts a class 10th science subject .

Class 10yh Science Acid bases and salts

1. 1 / 16
CBSE
ACIDS BASES AND SALTS WS 3
Class 10 - Science
a)No reaction takes place. b)H
2 and Fe
3O
4 are formed.
c)H
2 and Fe
2O
3 are formed. d)O
2 and Fe(OH)
3 are formed.
1. When steam is passed over red hot iron [1]
a)turned blue b)turned light pink
c)did not change d)turned green and suddenly yellow
2. Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip [1]
a) b)
c) d)
3. While demonstrating acid-base reactions, Ms. Rajnish, a science teacher added sodium oxide to HCI until it was
in excess. Which of the following graphs correctly represents the change in pH?
[1]
a)LiCl b)KCl
c)HCl d)NaCl
4. A solution reacts with crushed egg shells to give a gas that turns lime water milky. The solution contains[1]
a)Conc. HNO
3 b)Dil. HNO
3
c)
Both have same H
+
ion concentration
d)
No H
+
ion is present is HNO
3
5. Between dilute and concentrated samples of HNO
3 which sample of HNO
3 will have a higher H
+
ion
concentration?
[1]
a)the mixture becomes light yellow b)the mixture becomes warm
c)a solid settles at the bottom d)a gas evolves
6. Sodium bicarbonate solution is added to dilute ethanoic acid. It is observed that [1]
a)Spinach b)Curd
7. Formic acid is found in [1]

2. 2 / 16
c)Ascorbic acid d)Ant's sting
a)indicator scale b)pH scale
c)acid scale d)alkaline scale
8. A scale for measuring hydrogen ion concentration in a solution is called [1]
a)Marble b)Limestone
c)Lime d)Baking soda
9. Which of the following substance will not give carbon dioxide on treatment with dilute acid?[1]
a)it is dry b)
it does not ionize to form H
+
and Cl
−
ions
c)it is a polar covalent compound d)it is a gas
10. Dry HCl gas does not show acidic nature because [1]
a)PbSO
4 b)AgCl
c)Na
2SO
4 d)Na
2CO
3
11. An acid can react with [1]
a)Antacid b)Antiseptic
c)Antibiotics d)Analgesic
12. Which one of the following types of medicines is used for treating indigestion? [1]
a)(iv) only b)(ii) and (iv)
c)(ii) only d)(i) and (iii)
13. In an attempt to demonstrate electrical conductivity through an electrolyte, the following 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
iv. Bulb will not glow because it depends upon the type of electrolytic solution
[1]
14. A student adds a few drops of the universal indicator to a dilute solut
i
on of sodium bicarbonate taken in test
tube.
[1]

3. 3 / 16
a)Yellow b)Green
c)Blue d)Mustard
Which of the following colours, would be observe?
a)green b)violet
c)red d)yellow
15. A student adds a few drops of the universal indicator to a solution of dilute hydrochloric acid in the way shown
here. He would observe that the colour of the solution changes from colourless to
[1]
a)sodium carbonate should be taken in
solution form
b)thistle funnel is not dipping in acetic acid
solution and CO
2 gas escape.
c)solid acetic acid should be added d)apparatus is not air tight
16. What is wrong in the given set up if lime water does not change milky? [1]
a)I b)III
c)IV d)II
17. The figures below show set-ups for studying the reaction of zinc with sodium hydroxide.
The correct set-up is
[1]
18. On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes
labelled P, Q, R respectively the colours developed in the solutions are marked in the following figures.
[1]

4. 4 / 16
a)P > R > Q b)Q > R > P
c)R > P > Q d)P > Q > R
The correct order of their pH value is
a)Na
2CO
3 b)NaOH
c)either Na
2CO
3 or NaHCO
3 d)NaHCO
3
19. X is :
[1]
a)R > Q > P b)Q > P > R
c)R > P > Q d)P > Q > R
20. On adding a few drops of universal indicator to three unknown colourless solution (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 :
[1]
a)III b)I
c)IV d)II
21. Which of the following pairs of safety symbols are marked on the bottles of commercial acetic acid available in
the laboratory?
[1]
a)Red b)Blue
22. Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the
pH of the resulting solution is checked with a pH paper. What would be the colour obtained? (You may use
colour guide given in Figure
[1]

5. 5 / 16
c)Yellowish green d)Yellow
a)I b)II
c)IV d)III
23. Four set ups as given below were arranged to identify the gas evolved when dilute Hydrochloric acid was added
to Zinc granules. The most appropriate set up is :
[1]
a)Rapid reaction in both the test tubesb)No reaction in any of the test tubes.
c)Slow reaction in (A) and rapid reaction in
(B)
d)Rapid reaction in (A) but a slow reaction in
(B)
24. A student took two test tubes containing 2 ml of dilute hydrochloric acid and added zinc granules to test tube (A)
and solid sodium carbonate to test tube (B) as shown below:
The correct observation would be
[1]
a)III and IV b)I and III
c)II and IV d)I and II
25. Four experimental set-ups are shown below to study the reaction of HCl and NaOH on zinc and sodium
carbonate.

The set-ups that would results in a rapid evolution of gas would be
[1]
26. A student performed an experiment using zinc granules and sodium carbonate with sodium hydroxide and
hydrochloric acid under different conditions as shown here.
[1]

6. 6 / 16
a)II b)III
c)I d)IV
He would observe that no gas is evolved in the set up :
a)dilute sodium hydroxide b)dilute sodium bicarbonate solution
c)dilute hydrochloric acid d)water
27. A student placed a few drops of a liquid over a portion of the blue litmus paper as shown here. He observed that
the blue litmus paper turned red. The liquid could be
[1]
a)(ii), (iii) and (iv) b)(i) only
c)(i) and (ii) d)(ii) only
28. In the given experimental set-up, if the experiment is carried out separately with each of the following solutions
the cases in which the bulb will glow is/are:
i. Dilute hydrochloric acid
ii. Dilute sulphuric acid
iii. Glucose solution
iv. Alcohol
[1]
29. On putting few drops of an unknown liquid on the pH strip as shown here, the colour of pH strip changed to
violet.The liquid taken is likely to be :
[1]

7. 7 / 16
a)dilute acetic acid b)dilute sodium hydroxide
c)water d)dilute hydrochloric acid
a)I and III b)II and III
c)III and IV d)I and II
30. If burning candle is brought near each of the following test tube, in which of the following candle will get
extinguished?
[1]
a)I and II b)I, III and IV
c)II only d)I and III
31. In which of the following gas evolved will burn explosively? [1]
a)A b)C
c)B d)D
32. Four student studied reactions of zinc and sodium carbonate with dilute hydrochloric acid and dilute sodium
hydroxide
solutions and presented their results as follows. The fig represents evolution of gas, whereas '×' represents
absence of any reaction.
ṇThe right set of observation is that of student
[1]
33. Which one of the following set ups is the most appropriate for the evolution of hydrogen gas and its
identification ?
[1]

8. 8 / 16
a)III b)I
c)IV d)II
a)it turns milky due to carbon dioxide gas
liberated in the reaction and after sometime
it becomes colourless due to formation of
calcium carbonate.
b)the carbon dioxide liberated during the
reaction turns lime water milky due to
formation of calcium hydrogen carbonate
and after some time it turns colourless due
to formation of calcium carbonate which is
soluble in water.
c)it turns milky due to formation of calcium
carbonate and on passing excess of carbon
dioxide it becomes colourless due to
formation of calcium hydrogen carbonate
which is soluble in water.
d)it turns milky due to passing of carbon
dioxide through it. It turns colourless as on
further passing carbon dioxide, sodium
hydrogen carbonate is formed which is
soluble in water.
34. In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the
solution X the solution X first turns milky and then colourless.
The option that justifies the above stated observation is that X is aqueous calcium hydroxide.
[1]
a)evolution of gas b)no change
c)Zn granules turned green d)formation of a precipitate
35. A student added dilute HCl to Zn granules taken in a test tube. The correct observation would be [1]
36. 5 mL of acetic acid was added to equal volume of water and the mixture was shaken well for one minute and
allowed to settle. The correct representation of the observation made would be as given in test tube
[1]

9. 9 / 16
a)III b)I
c)II d)IV
a)5 b)9
c)10 d)8
37.
A solution turns blue litmus red, its pH is likely to be
[1]
a)1-A, 2-C, 3-B, 4-D b)1-D, 2-A, 3-C, 4-B
c)1-B, 2-D, 3-A, 4-C d)1-C, 2-B, 3-D, 4-A
38. Match the following with correct response.
(1) Citric acid (A) Vinegar
(2) acetic acid (B) tamarind
(3) Nitric acid (C) mineral acid
(4) Tartaric acid (D) Lemon
[1]
a)A- (ii), B - (i), C - (iv), D - (iii)b)A - (iii), B - (iv), C - (i), D - (ii)
c)A- (ii), B - (iv), C - (i), D - (iii)d)A - (iii), B - (ii), C - (iv), D - (i)
39. Match the chemical substances given in Column (A) with their appropriate application given in Column (B)
Column (A) Column (B)
(A) Bleaching powder (i) preparation of glass
(B) Baking soda (ii) Production of H
2 and Cl
2
(C) Washing soda (iii) Decolourisation
(D) Sodium chloride (iv) Antacid
[1]
40. Match the following with correct response.
Column A Column B
(i) Sodium carbonate (a) Fire extinguishers
(ii) Plaster of Paris (b) For ornamental casting
[1]

10. 10 / 16
a)(i) - (a), (ii) - (c), (iii) - (b), (iv) - (b)b)(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
c)(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)d)(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)
(iii) Calcium oxychloride (c) For water softening
(iv) Sodium bicarbonate (d) For bleaching wool
a)(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)b)(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
c)(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)d)(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
41. Match the following with correct response.
Column A Column B
(i) Strongly alkaline (a) Yellow
(ii) Weakly alkaline (b) Violet
(iii) Weakly acidic (c) Red
(iv) Strongly acidic (d) Blue
[1]
a)1-C, 2-B, 3-D, 4-A b)1-B, 2-D, 3-A, 4-C
c)1-A, 2-C, 3-B, 4-D d)1-D, 2-A, 3-C, 4-B
42. Match the following with correct response.
(1) Metal oxides (A) Hydroxyl Ions
(2) Non-metal oxides (B) Acidic
(3) Salts (C) Basic
(4) Bases (D) Neutral
[1]
a)(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)b)(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
c)(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)d)(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
43. Match the following with correct response.
Column A Column B
(i) Strong acid (a) H
2SO
4
(ii) Strong base (b) CH
3COOH
(iii) Weak acid (c) NaOH
(iv) Weak base (d) NH
4OH
[1]
44. Match the following with correct response.
Column A Column B
(i) Bleaching powder (a) Calcium oxychloride
(ii) Baking soda (b) Sodium carbonate
(iii) Washing soda (c) Sodium bicarbonate
[1]

11. 11 / 16
a)(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)b)(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
c)(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)d)(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
(iv) Plaster of Paris (d) Calcium sulphate hemihydrate
a)(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)b)(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
c)(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)d)(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
45. Match the following with correct response.
Column A Column B
(i) Acidic solution (a) pH 8
(ii) Basic Solution (b) pH 1
(iii) Neutral Solution (c) pH 7
(iv) Highly acidic solution (d) pH 5
[1]
a)tasteless b)sweet
c)bitter d)sour
46. Bases are ________ in taste. [1]
a)Hydrogen ions b)Sodium ions
c)Chloride ions d)Hydroxide ions
47. The basic nature of sodium hydroxide (NaOH) is due to the presence of ________ in solution.[1]
a)formic b)citric
c)tartaric d)lactic
48. Lemon contains ________ acid. [1]
a)tasteless b)sour
c)bitter d)sweet
49. Acids are ________ in taste. [1]
a)Statement A b)Neither A nor B
c)Statement B d)Both A and B
50. Statement A : HCl doesn’t show acidic properties in organic solvent.
Statement B : HCl shows acidic properties in aqueous solution.
Which of the statement is true?
[1]
a)Neither statement A nor statement B is trueb)Statement A is true, B is false
c)Statement B is true, A is false d)Both statements A and B are true.
51. Statement A : Sulphuric acid is diprotic acid and phosphoric acid is triprotic acid.
Statement B : Chlor-alkali process is involved in the manufacturing of bleaching powder
[1]
a)All metal oxides react with water to give
salt and hydrogen gas.
b)Some non-metal oxides react with water to
form acids.
52. Which one of the following statements is not correct? [1]

12. 12 / 16
c)Some of the metals react with acids to give
salt and hydrogen gas.
d)Generally, all metal carbonates react with
acids to give salt, water and carbon dioxide.
a)A and C b)C and D
c)A and B d)All of these
53. Which of the given statement is true about Sodium carbonate:
A. It is a transparent crystalline white solid
B. It has the chemical formula Na
2CO
3.10H
2O
C. It gives acidic solution when dissolved in water
D. It is prepared by reacting with chlorine
[1]
a)Sour and change red litmus to blue b)Sour and change blue litmus to red
c)Bitter and change red litmus to blued)Bitter and change blue litmus to red
54. Which of the following statements is true for acids? [1]
a)A and C b)All of these
c)B and C d)A, B and D
55. Which of the following statements are correct?
A. Chemical name of bleaching powder is calcium oxychloride.
B. Bleaching powder is used for sterilization of drinking water.
C. Bleaching powder is alkaline in nature hence it is used as antacid.
D. Bleaching powder is manufactured by Hasen Clever process.
[1]
a)Statement (A) b)Statement (C)
c)Statement (D) d)Statement (B)
56. Find the incorrect statement:
A. The pH of the stomach is approximately 4.5
B. Plants grow well in natural soil
C. The pH of acid rain is nearly 5.6
D. The pH of rainwater is nearly 7
[1]
a)Statement (c) is incorrect. b)Statement (a) is incorrect.
c)Statement (b) is incorrect. d)Statement (d) is incorrect.
57. Select the incorrect statement.
a. The formula of the compound is calcium sulphate dihydrate.
b. When mixed with water and left for half an hour, this compound sets into a hard mass.
c. If heated at higher temperature, the compound becomes dehydrated and is called dead burnt plaster.
d. Both (a) and (b)
[1]
58. Which of the following statements are correct abount an aqueous solution of an acid and of a base?
A. higher the pH, stronger the acid
B. higher the pH, weaker the acid
C. Lower the pH, Stronger the base
D. Lower the pH, weaker the base
[1]

13. 13 / 16
a)All of these b)A and D
c)B and C d)A and C
a)(B) and (D) only b)(A) and (B) only
c)(A), (B) and (D) d)(A), (C) and (D)
59. When sodium hydrogen carbonate is added to ethanoic acid a gas evolves.
Consider the following statements about the gas evolved?
A. It turns lime water milky.
B. It is evolved with a brisk effervescence.
C. It has a smell of burning sulphur.
D. It is also a by-product of respiration.
The correct statements are:
[1]
a)(iii) and (iv) b)(iii) only
c)(i) only d)(ii) and (iv)
60. Which of the following is(are) true when HCl (g) is passed through water?
i. It does not ionise in the solution as it is a covalent compound.
ii. It ionises in the solution
iii. It gives both hydrogen and hydroxyl ion in the solution
iv. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule
[1]
a)Some metals react with acids to give salt
and hydrogen.
b)Some non metal oxides react with water to
form an acid.
c)All metal carbonates react with acid to give
a salt, water and carbon dioxide.
d)All metal oxides react with water to give
salt and acid.
61. Which of the following statements is not correct? [1]
a)2NaCl (aq) + 2H
2O(aq)  2NaOH (aq) +
Cl
2 (g) + H
2 (g)
b)2NaCl (aq) + 2H
2O(l)  2NaOH(aq) + Cl
2
(aq) + H
2 (aq)
c)2NaCl (l) + 2H
2O(l)  2NaOH(l) + C1
2 (g)
+ H
2 (g)
d)2NaCl (aq) + 2H
2O (l)  2NaOH (aq) +
Cl
2 (g) + H
2 (g)
62. Identify the correct representation of reaction occurring during chloralkali process [1]
→ →
→ →
63. Given below are the observations reported by four students I, II, III and IV for the changes observed with dilute
HCl or dilute NaOH and different materials.
Material Dil. HCl Dil. NaOH
I. Moist litmus paper Blue to red Red to blue
II. Zinc metal
React at room
temperature
Does not react
at room temperature
III. Zinc metal on
heating
Liquid becomes
milky
Remains clear and
transparent
[1]

14. 14 / 16
a)IV b)II
c)III d)I
IV. Solid sodium
bicarbonate
No reaction Brisk effervescence
The incorrectly reported observation is
a)A b)B
c)D d)C
64. Four students added a small amount of ethanoic acid to sodium bicarbonate. The gas evolved was tested for its
behaviour with burning splinter and lime water.
StudentGas evolvedAction of burning splinter Action of lime water
A CO
2 The flame of splinter extinguishes and gas does not burnTurned milky
B SO
2 The splinter burns brightly and the gas burns with a popTurned green
C NO
2 The gas does not burn but the splinter burns with a hissing soundTurned black
D O
2 The gas burns with a yellow flame and the splinter extinguishesTurned purple
They reported their observations as given below:
The correct observations have been reported by student:
[1]
a)II b)IV
c)I d)III
65. In an experiment to test the pH of a given sample using pH paper, four students recorded the following
observations :
Sample taken turned to pH paper color
(I) Water Blue
(II) Dilute HCl Red
(III) Dilute NaOH Blue
(IV) Dilute Ethanoic Acid Orange
Which one of the above observations is incorrect?
[1]
66. 2 mL of ethanoic acid was taken in each, test tube I and test tube II. A red litmus paper was introduced in test
tube I and a pH paper was introduced in test tube II. The experiment was performed by four students A, B, C, D
and they reported their observations as given in the table:
Student Action on Red Litmus Action on pH paper
A Turned blue Turned pink
B Remains unchanged Turned green
[1]

15. 15 / 16
a)B b)C
c)A d)D
C Turned blue Turned blue
D Remains unchanged Turned pink
The correct set of observations were made by student
a)IV b)III
c)II d)I
67. Ethanoic acid was added to Sodium bicarbonate solution and the gas evolved was tested with a burning splinter.
The following four observations were reported:
I . The gas burns with the pop sound and the flame gets extinguished.
II . The gas does not burn but the splinter burns with a pop sound.
III. The flame extinguishes and the gas does not burn.
IV. The gas burns with a blue flame and the splinder burns brightly.
The correct observation is reported in
[1]
a)Dilute hydrochloric acid b)Red litmus
c)Blue litmus d)sodium carbonate solution
68. Ayush and Ishoo were given one test tube each. One of the test tube contained water and the other contained a
solution of sodium hydroxide. They were asked to identify the test tube containing NaOH solution. Which one
of the following can be used for correctly identifying the required test tube?
[1]
a)Sodium carbonate solution b)Blue litmus
c)Dilute carbonate solution d)Red litmus
69. A teacher gave two test tubes, one containing water and the other containing sodium hydroxide solution, to the
students and asked them to identify the test tube containing sodium hydroxide solution. Which one of the
following can be used for correctly indentifying the test tube containing sodium hydroxide solution ?
[1]
a)(C) b)(A)
c)(D) d)(B)
70. 10 ml of HCl and 10 ml of NaOH solutions are contained 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 but not so in beaker II
C. gas is evolved in beaker II but not in beaker I
D. no gas is evolved in either of the two beakers
[1]
a)blue to pink b)pink to blue
c)green to pink d)pink to green
71. 1.0 ml of lemon juice was taken in a test tube. Its pH was determined by using a pH paper. Excess of sodium
hydroxide solution was then added to the lemon juice in the test tube and the pH of the resulting solution was
again determined. It was observed that the colour of the pH paper changed from:
[1]

16. 16 / 16
a)B and C b)A and B
c)A and D d)B and D
72. To distinguish between two given colourless solutions, one of which is distilled water and the other is dilute
sodium hydroxide, the following chemicals are available in the laboratory
A. Blue litmus solution
B. Red litmus solution
C. Granulated zinc
D. Sodium bicarbonate solution
Which two chemicals, out of the four, will a student use to distinguish these solutions?
[1]
a)8ml b)12ml
c)4ml d)16ml
73. 10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we
take 20 mL of the same solution of NaOH, the amount HCl solution (the same solution as before) required to
neutralise it will be
[1]
a)C < B  < A  < D   b)A  < B < C  < D
c)A < D <  C < B d)B < C <  A  < D
74. A student was given four unknown colourless samples labelled A, B, C and D and asked to test 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
[1]
a)red b)orange
c)blue d)green
75. A student tested the pH of distilled water using pH paper and observed green colour. After adding a few drops of
dilute NaOH solution, the pH was tested again. The colour change now observed would be
[1]