Acids, Bases and Salts Class 10 Science Multiple Choice Questions & Answers

Question-1. Which one of the following will turn red litmus blue?

1. Vinegar
2. Baking soda solution
3. Lemon juice
4. Soft drinks

Question-2. A calcium compound reacts with dilute hydrochloric acid to produce effervescence

1. The gas evolved extinguishes a burning candle. Identify the compound and the gas evolve
2. Calcium Carbonate, Carbon dioxide
3. Calcium chloride, carbondioxide
4. Calcium oxide, hydrogend) Calcium carbonate, hydrogen

Question-3. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

1. Lemon juice
2. Vinegar
3. Common salt
4. An antacid

Question-4. A strong acid:

1. Completely gets ionized in water
2. Partially gets ionized in water
3. Do not get ionized in water
4. All the these

Question-5. Acid present in apple is :

1. Oxalic acid
2. Malic acid
3. Acetic acid
4. Formic acid

Question-6. Acids react with bases to form salt and water. This reaction is known as

1. Combination
2. Decomposition
3. Neutralisation
4. reduction

Question-7. Acids react with metal carbonates to liberate…............gas

1. Carbon dioxide
2. Carbon monoxide
3. Hydrogen
4. Water

Question-8. Acids react with metals to liberate…........gas

1. Carbon dioxide
2. Carbon monoxide
3. Hydrogen
4. Water

Question-9. Alkalis are

1. acids, which are soluble in water
2. acids, which are insoluble in water
3. bases, which are insoluble in water
4. bases, which are soluble in water

Question-10. Ammonium sulphate salt is

1. Basic salt
2. Acidic salt
3. Neutral salt
4. Complex salt

Question-11. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

1. Baking powder
2. Lime
3. Ammonium hydroxide solution
4. Hydrochloric acid

Question-12. An aqueous solution with pH-zero is

1. Acidic
2. Alkaline
3. Neutral
4. Amphoteric

Question-13. An indicator is one kind of the following compound

1. Strong acid only
2. Reducing agent
3. Weak base or acid only
4. Complex salt

Question-14. Black ash is

1. Dry KOH
2. Barium sulphide
3. Charcoal
4. Hydrated KOH

Question-15. Bleaching powder is used as a disinfectant for water to:

1. Make water tastier
2. Remove all the dirt from water
3. Make water germ-free
4. Make water clear

Question-16. Bleaching powder is:

1. CaO2Cl2
2. CaOCl2
3. CaClO2
4. CaCl2 + O2

Question-17. Brine is an

1. aqueous solution of sodium hydroxide
2. aqueous solution of sodium carbonate
3. aqueous solution of sodium chloride
4. aqueous solution of sodium bicarbonate

Question-18. Calcium phosphate is present in tooth enamel. Its nature is [NCERT Exemplar Problems]

1. basic
2. acidic
3. neutral
4. amphoteric

Question-19. Common salt besides being used in kitchen can also be used as the raw material for making(i) washing soda (ii) bleaching power (iii) baking soda (iv) slaked lime

1. i and ii
2. i, ii and iv
3. i and iii
4. i, iii and iv

Question-20. Dilute acid does not produce carbon dioxide on being treated with:

1. Marble
2. Lime
3. Baking soda
4. Limestone

Question-21. Due to excess passing of CO2 through an aqueous solution of slaked lime, its milkiness fades because

1. Calcium carbonate is produced
2. Calcium bi-carbonate is produced
3. Calcium oxide is produced
4. Due to the production of more heat

Question-22. Egg shell is made up of

1. CaCO3
2. CaO
3. Ca(OH)2
4. CaCl2

Question-23. How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

1. Increases
2. Decreases
3. Remains the same
4. Becomes zero

Question-24. Identify the correct representation of reaction occurring during chlor-alkali process

1. 2NaCl(l) + 2H2O(l)→2NaOH(l) + Cl2(g) + H2(g)
2. 2NaCl(aq) + 2H2O(aq) → 2NaOH(aq) + Cl2(g) + H2(g)
3. 2NaCl(aq) + 2H2O(l) →2NaOH(aq) + Cl2(aq) + H2(aq)
4. 2NaCl(aq) + 2H2O(l) →2NaOH(aq) + Cl2(g) + H2(g)

Question-25. If a few drops of a concentrated acid accidentally spills over the hand of a student, what should be done?

1. Wash the hand with saline solution
2. Wash the hand immediately with plenty of water and apply paste of sodium hydrogen carbonate.
3. After washing with plenty of water, applies solution of sodium hydroxide on the han
4. d) Neutralize the acid with a strong alkali.

Question-26. If pH of solution is 13, it means that if is

1. Weakly acidic
2. Weakly basic
3. Strongly acidic
4. Strongly Basic

Question-27. Lime water is

1. CaO
2. Ca(OH)2
3. CaCO3
4. CaCI2

Question-28. Lime water reacts with chlorine to give

1. bleaching powder
2. baking powder
3. baking soda
4. washing soda

Question-29. Lime water turns milky when carbon dioxide is passed due to the formation of…......

1. CaCO3
2. CaO
3. CO2
4. CaSO4

Question-30. Many salts absorbs water from atmosphere. This property is called

1. deliquescence
2. efflorescence
3. hydration
4. addition

Question-31. Metal hydrogen carbonates react with acids to give

1. salt, water, chlorine
2. salt, water and carbon dioxide
3. salt and carbon dioxide
4. salt, hydrogen and carbon dioxide

Question-32. Methyl orange is

1. Pink in acidic medium, yellow in basic medium
2. Yellow in acidic medium, pink in basic medium
3. Colourless in acidic medium, pink in basic medium
4. Pink in acidic medium, colourless in basic medium

Question-33. Na2CO3 . 10H2O is

1. washing soda
2. baking soda
3. bleaching powder
4. tartaric acid

Question-34. Name the salt formed in the above reaction

1. copper carbonate
2. copper chloride
3. copper citrate
4. copper citrate

Question-35. Nettle sting is a natural source of which acid?

1. MetiWanoic acid
2. Lactic acid
3. Citric acid
4. Tartaric acid

Question-36. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

1. hydrochloric acid
2. tartaric acid
3. acetic acid
4. sulphuric acid

Question-37. pH of a solution having hydrogen ion concentration of 1M is

1. 1
2. 10
3. 14

Question-38. Phenolphthalein's colour in basic medium is…........but in acid it is…....

1. Pink, Colorless
2. Yellow, Pink
3. Pink, Orange
4. Blue, Red

Question-39. Rain is called acid rain when its

1. pH falls below 7
2. pH falls below 6
3. pH falls below 5.6
4. pH is above 7

Question-40. Setting of Plaster of Paris takes place due to

1. Oxidation
2. Reduction
3. Dehydration
4. Hydration

Question-41. Sodium carbonate is a basic salt because it is a salt of

1. strong acid and strong base
2. weak acid and weak base
3. strong acid and weak base
4. weak acid and strong base

Question-42. Sodium hydroxide is a

1. weak base
2. weak acid
3. strong base
4. strong acid

Question-43. Sodium hydroxide turns phenolphthalein solution

1. pink
2. yellow
3. colourless
4. orange

Question-44. The milkiness (on passing excess carbondioxide gas through lime water) disappears due to the formation of

1. Calcium carbonate CaCO3
2. Calcium hydrogen carbonate CaHCO3
3. Calcium oxide CaO
4. Calcium Nitrate Ca(NO3)2

Question-45. The nature of copper oxide is

1. acidic
2. basic
3. neutral
4. amphoteric

Question-46. The odour of acetic acid resembles that of

1. Rose
2. Burning Plastic
3. Vinegar
4. Kerosene

Question-47. The pH of the gastric juices released during digestion is

1. less than 7
2. more than 7
3. equal to 7
4. equal to 0

Question-48. The phenomenon of copper getting tarnished is

1. corrosion
2. rancidity
3. displacement
4. none of these

Question-49. Tooth enamel is made up of

1. calcium phosphate
2. calcium carbonate
3. calcium oxide
4. potassium

Question-50. What happens when a base is added to vanilla?

1. Color of vanilla changes into red
2. Vanilla becomes colorless
3. Vanilla loses its smell
4. Nothing happens

Question-51. What is formed when zinc reacts with sodium hydroxide?

1. Zinc hydroxide and sodium
2. Sodium zincate and hydrogen gas
3. Sodium zinc-oxide and hydrogen gas
4. Sodium zincate and water

Question-52. What is the pH value of sodium chloride?

1. 7
2. More than 7
3. Less than 7
4. Zero

Question-53. When copper oxide and dilute hydrochloric acid react, colour changes to

1. white
2. bluish-green
3. blue-black
4. black

Question-54. When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

1. absorb the evolved gas
2. moisten the gas
3. absorb moisture from the gas
4. absorb Cl? ions from the evolved gas

Question-55. Which of the following acid is also known as vinegar?

1. Dilute hydrochloric acid
2. Dilute sulphuric acid
3. Dilute acetic acid
4. Dilute tartaric acid

Question-56. Which of the following acids is present lemon?

1. Formic acid
2. Acetic acid
3. Citric acid
4. Hydrochloric acid

Question-57. Which of the following gives the correct increasing order of acidic strength ?

1. Water < Acetic acid < Hydrochloric acid
2. Water < Hydrochloric acid < Acetic acid
3. Acetic acid < Water < Hydrochloric acid
4. Hydrochloric acid < Water < Acetic acid

Question-58. Which of the following is acidic in nature ?

1. Lime juice
2. Human blood
3. Lime water
4. Antacid

Question-59. Which of the following is not a acidic salt?

1. CuSO4
2. NH4Cl
3. FeCl3
4. CH3COONa

Question-60. Which of the following is not a mineral acid ?

1. Hydrochloric acid
2. Citric acid
3. Sulphuric acid
4. Nitric acid

Question-61. Which of the following salts does not contain water of crystallization ?

1. Blue vitriol
2. Baking soda
3. Washing soda
4. Gypsum

Question-62. Which of the following statements is true for acids ?

1. Bitter and change red litmus to blue
2. Sour and change red litmus to blue.
3. Sour and change blue litmus to re
4. d) Bitter and change blue litmus to red)

Question-63. Which one of the following types of medicines is used for treating indigestion?

1. Antibiotics
2. Analgesic
3. Antacid
4. Antiseptic

Question-64. Which one of the given is true, if a substance has a pH value of 4?

1. The substance is a base
2. The substance is an acid
3. The substance is a neutral substance
4. Either (1) or (2)

Question-65. Why does dry HCl gas not change the colour of the dry litmus paper?

1. Blue litmus becomes dry in presence of dry HCl gas
2. No H3O+ ions will be present, litmus changes colour only in the presence of H3O+ ions
3. HCl gas acts asa dehydrating agent
4. None of the above

Question-66. You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.

1. Acid
2. Base
3. Water
4. All of the above

Question-67. Chemical formula of baking soda is:

1. MgSO4
2. Na2CO3
3. NaHCO3
4. MgCO3

Question-68. The chemical formula of caustic potash is

1. NaOH
2. Ca(OH)2
3. NH4OH
4. KOH

Question-69. Which among the following is not a base ?

1. NaOH
2. KOH
3. NH4OH
4. C2H5OH