This post contains 100 important Multiple-Choice Questions from Class 10 Science Chapter 2 Acids, Bases and Salts based on the latest NCERT Science Textbook syllabus and board pattern.
These MCQs are designed to help students understand key concepts such as the pH scale, properties of acids, bases, and salts, indicators, and important chemical reactions in a simple, easy way. Each question is provided with the correct answer. This is useful for students who are studying through the NCERT Science book.
Last updated: April 2026| New MCQs added as per the latest exam pattern
pH Scale and Indicators MCQs
Q3. pH of an acid is
(a) 7
(b)>7
(c)
<7
(d)14
Correct
answer- (c)
Explanation – The pH value of an acid is below 7 based on the PH scale.
Q4. The pH of a substance is a
(a) log [H+]
(b)- log
[H+]
(c) log [OH-]
(d)- log
[OH-]
Correct answer- (b)
Explanation – Formula to find PH value
is PH = -lig[H+].
Q5.In a neutral solution, pH is equal to
(a) zero
(b)greater than 7
(c) 14
(d)7
Correct
answer- (d)
Q 6.H+ion concentration of a solution is 10-4,
its pH
(a) 4
(b)- 4
(c)
-10
(d)10
Correct answer- (a)
Q 7.The highest pH (14) is given by
(a)
1 M HCI
(b)0.5 M H2SO4
(c) 0.005 M HCI
(d)1M NaOH
Correct answer- (d)
Explanation – Concentration of hydroxyl ions is maximum in 1 M NaOH, so it has the highest PH value.
Q
8.pH of a base is
(a) 7
(b)>7
(c) <7
(d)14
Correct answer- (b)
Explanation – A base has a PH value higher than 7.
Q9.POH of a solution is 9, its pH is
(a) 5
(b)2
(c) 9
(d)14
Correct answer- (a)
Q10.In a basic solution, the colour of phenolphthalein is
(a) purple
(b)pink
(c) red
(d)yellow
Correct answer- (b)
Q11.Acids
(a) produce H+ in an aqueous solution
(b)neutralise base
(c) mostly produce hydrogen with metals
(d)all the above
Correct answer- (d)
Q12.A weak acid is
(a) acetic acid
(b)hydrochloric acid
(c) nitric acid
(d)sulphuric acid
Correct answer- (a)
Explanation – Acetic acid produces fewer hydrogen ions in solution, so it is a weak acid.
Q13.Diprotic acid is
(a) acetic acid
(b)hydrochloric acid
(c)nitric acid
(d)sulphuric acid
Correct answer- (d)
Q14.In pickling, vinegar acts as
(a) an oxidant
(b)disinfectant
(c) preservative
(d)all the above
Correct answer- (c)
Q15.Vinegar contains
(a) acetic acid
(b)lactic acid
(c) citric acid
(d)tartaric acid
Correct answer- (a)
Q16.Lemon juice contains
(a) acetic acid
(b)lactic acid
(c) citric acid
(d)tartaric acid
Correct answer- (c)
Q17.Curds contain
(a) acetic acid
(b)citric acid
(c) lactic acid
(d)tartaric acid
Correct answer- (c)
Reactions of Acids with Metal and Carbonates
Q18.When zinc granules are added to dilute sulphuric acid, the gas produced is
(a) Hydrogen
(b) oxygen
(c) carbondioxide
(d)all the above
Correct answer- (a)
Explanation – When metals react with an acid, they produce Hydrogen gas.
Q19.The sum of pH and POH is
(a) 7
(b)10
(c) 9
(d)14
Correct answer- (d)
Q20.The colour of a neutral litmus solution is
(a) purple
(b)blue
(c) red
(d)yellow
Correct answer- (a)
Q21.Tamarind contains
(a) acetic acid
(b)lactic acid
(c) citric acid
(d)tartaric acid
Correct answer- (d)
Q22.In an acidic solution, the colour of litmus is
(a) purple
(b)blue
(c) red
(d)yellow
Correct answer- (c)
Q23.In a basic solution, the colour of litmus is
(a) purple
(b)yellow
(c) red
(d)blue
Correct answer- (d)
Q 24. In a basic solution, the colour of methyl orange is
(a) purple
(b)pink
(c) red
(d)yellow
Correct answer- (d)
Q25.When washing soda is reacted with dilute hydrochloric acid, the gas produced is
(a) hydrogen
(b)oxygen
(c) carbon dioxide
(d)all the above
Correct answer- (c)
Q26.Carbon dioxide is produced when dilute acids react with
(a) chalk
(b)limestone
(c) marble
(d)all the above
Correct answer- (d)
Common Salts and Their Names MCQs
Q27.Common name of Na2CO3 is
(a) bleaching powder
(b)baking soda
(c) plaster of Paris
(d)washing soda
Correct answer- (d)
Q28.Common name of (CaSO4)2. H2O is
(a) bleaching powder
(b)baking soda
(c) plaster of Paris
(d)washing soda
Correct answer- (c)
Q29.Common name of CaOCI2 is
(a) bleaching powder
(b)baking soda
(c) plaster of Paris
(d)washing soda
Correct answer- (a)
Q30.To maintain joints fixed after fracture, the compound used is
(a)CaOCI2
(b)CaCO3
(c) (CaSO4)2.H2O
(d)Ca (OH)2
Correct answer- (c)
Q31.For bleaching paper and clothes, the compound used is
(a) CaOCI2
(b)CaCO3
(c) (CaSO4)2.H2O
(d)Ca (OH)2
Correct answer- (a)
Explanation – The chemical formula of bleaching powder is CaOCl2.
Q32.For white-washing, the compound used is
(a) CaOCI2
(b)CaCO3
(c) (CaSO4)2.H2O
(d)Ca(OH)2
Correct answer- (d)
Explanation – For white-washing, slaked lime is used, and the formula of slaked lime is Ca(OH)2
Q33.Gypsum is
(a) CaSO4. ½ H2O
(b)CaSO2 . 2H2O
(c) CaSO4 . 3H2O
(d)CaSO4
Correct answer- (b)
Q34.Common name of NaHCO3 is
(a) bleaching powder
(b) baking soda
(c) plaster of Paris
(d)washing soda
Correct answer- (b)
Q35.The chlor-alkali process is used in the preparation of
(a) bleaching powder
(b)chlorine
(c) sodium hydroxide
(d)ammonia
Correct answer- (c)
Q36.Clouds of sulphuric acid are present in the atmosphere of
(a) earth
(b)mars
(c) venus
(d)moon
Correct answer- (c)
Q37.Washing soda is used in the manufacture of
(a) soap
(b)glass
(c) paper
(d)all the above
Correct answer- (d)
Q38.The statement is true for acids
(a) sour and turn red litmus to blue
(b)bitter and turn red litmus to blue
(c) sour and turn blue litmus to red
(d)bitter and turn blue litmus to red
Correct answer- (c)
Q39.The substance is acidic in nature
(a) antacid
(b)lime juice
(c) lime water
(d)human blood
Correct answer- (b)
Acid – Base Reactions and Concepts MCQs
Q40.When a small amount of acid is added to water, the phenomena occur, which are
(i) neutralisation
(ii)ionisation
(iii) salt formation
(iv)dilution
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
Correct answer- (c) (ii) and (iv)
Q41.When a solution of an acid is mixed with a solution of a base
(i)the temperature of the solution decreases
(ii)the temperature of the solution increases
(iii) Salt formation takes place
(iv) the temperature of the solution remains the same
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
Correct answer- (b)
Q42.Which of the following will not produce carbon dioxide with dilute HCI?
(a) limestone
(b)marble
(c) baking soda
(d)lime
Correct answer- (d)
Q43.Which of the following is not a mineral acid
(a) nitric acid
(b)sulphuric acid
(c) citric acid
(d)hydrochloric acid
Correct answer- (c)
Explanation – Citric acid is found in fruits and vegetables. It is not a mineral acid.
Q44.Which of the following is not a base
(a) C2H5OH
(b)NaOH
(c) KOH
(d)Ca(OH)2
Correct answer- (a)
Q45.An aqueous solution turns red litmus blue. Addition of which of the following solutions will reverse the reaction
(a) antacid
(b) hydrochloric acid
(c) baking powder
(d)lime water
Correct answer- (b)
Q46.Equal volumes of hydrochloric acid and sodium hydroxide solutions of the same concentration are mixed, the pH of the resulting solution will be
(a) zero
(b)6
(c) 5
(d)7
Correct answer- (d)
Explanation – Equal amounts of an acid and a base of the same concentration are mixed; they neutralise each other, so the pH of the resulting solution will be 7.
Q47.In the slaking of lime, lime reacts vigorously with water to form lime water by the liberation of heat. Which statement (s) is/are true about the reaction?
(i)it is an exothermic reaction
(ii)it is an endothermic reaction
(iii)the pH of the resulting solution is
>7
(iv)the pH of the resulting solution is <7
(a) (ii) and (iii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)
Correct answer- (b)
Q48.A dilute aqueous solution of hydrochloric acid contains
(a) H2O+ and OH-
(b) CI- and OH-
(c) H3O+ and CI-
(d)unionised HCl
Correct answer- (c)
Q49.The acid used to dissolve gold is
(a) Aqua regia
(b) Hydrochloric acid
(c) Nitric acid
(d)Sulphuric acid
Correct answer- (a)
Q50.The correct statement about an aqueous solution of an acid or a base is
(i)Lower the pH, stronger the acid
(ii) The higher the pH, the stronger the acid
(iii) The higher the pH, the stronger the base
(iv) The higher the pH, the weaker the base
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Correct answer- (b)
Q51.The salt, having no water of crystallisation, is
(a) washing powder
(b)baking soda
(c) blue vitriol
(d)gypsum
Correct answer- (b)baking soda
Q52.Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b)strong acid and weak base
(c) weak acid and strong base
(d)weak acid and weak base
Correct answer- (c)
Q53.Ammonium chloride is an acidic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) weak acid and strong base
(d) strong acid and weak base
Correct answer- (d)
Q54.Sodium hydrogen carbonate is one of the constituents of baking powder. Its other component is?
(a) acetic acid
(b)hydrochloric acid
(c) carbonic acid
(d)tartaric acid
Correct answer- (d)
Q55.To prevent tooth decay, we use toothpaste. The nature of toothpaste is
(a) acidic
(b)basic
(c) neutral
(d)None of the above
Correct answer- (b)
Q56. What happens to pH when an acid is diluted with water?
(a) Increases
(b) Decreases
(c) Same
(d) Becomes 7
Correct answer -
(a) Increases
Q57. Acid present in an ant sting is
(a) Citric acid
(b) Acetic acid
(c) Formic acid
(d) Lactic acid
Correct answer -
(c) Formic acid
Q58. Tooth enamel starts decaying below pH
(a) 7
(b) 6.5
(c) 5.5
(d) 4.5
Correct answer
-(c) 5.5
Q59. Which base is used for making soap?
(a) KOH
(b) NaOH
(c) Ca(OH)2
(d) NH4OH
Correct answer -
(b) NaOH
Q60. Which gas is formed when an acid reacts with a metal carbonate?
(a) H2
(b) O2
(c) CO2
(d) N2
Correct answer -
(c) CO2
Q61. Which indicator is colourless in acid and pink in base?
(a) Litmus
(b) Methyl orange
(c) Phenolphthalein
(d) Turmeric
Correct answer -
(c) Phenolphthalein
Q62. What is the formula of washing soda?
(a) Na2CO3.10H2O
(b) NaHCO3
(c) Na2CO3
(d) NaOH
Correct answer -
(a) Na2CO3.10H2O
Q63. Plaster of Paris is obtained by heating
(a) Gypsum
(b) Limestone
(c) Slaked lime
(d) Quick lime
Correct answer -
(a) Gypsum
Q64. Which salt is used to soften hard water?
(a) Baking soda
(b) Washing soda
(c) Bleaching powder
(d) POP
Correct answer -
(b) Washing soda
Q65. What is the nature of the solution when HCl reacts with NaOH?
(a) Acidic
(b) Basic
(c) Neutral
(d) Salty
Correct answer -
(c) Neutral
Q66. Which statement about water of crystallisation is correct?
(a) It is chemically inactive water only
(b) It gives shape and colour to the crystal
(c) It is always removed during melting
(d) It is present only in acids
Correct answer - (b) It gives shape and colour to the crystal
Q67. The phenomenon of passing electricity through brine is called?
(a) Neutralisation
(b) Electrolysis
(c) Distillation
(d) Chlorination
Correct answer -
(b) Electrolysis
Q68. Which of the following indicators is a synthetic indicator?
(a) Turmeric
(b) China rose
(c) Phenolphthalein
(d) Red cabbage
Correct answer - (c) Phenolphthalein
Q69. Bleaching powder is prepared by passing chlorine gas over:
(a) Calcium hydroxide
(b) Calcium carbonate
(c) Calcium oxide
(d) Sodium chloride
Correct answer-
(a) Calcium hydroxide
Q70. Which of the acids is responsible for acid rain?
(a) Hydrochloric acid
(b) Nitric acid and sulphuric acid
(c) Acetic acid
(d) Carbonic acid
Correct answer -
(b) Nitric acid and sulphuric acid
Q71. The pH value of a strong basic solution at room temperature will be
(a) Less than 7
(b) Equal to 7
(c) Greater than 7
(d) Equal to 0
Correct answer -
(c) Greater than 7
Q72. What is the function of a universal indicator in a solution?
(a) To produce smell
(b) To show colour change according to pH
(c) To release gas
(d) To change the temperature
Correct answer -
(b) To show colour change according to pH
Application of Acids, Bases and Salts in Daily Life MCQs
Q73. What is the chemical name of ‘milk of magnesia’?
(a) Magnesium hydroxide
(b) Sodium hydroxide
(c) Potassium hydroxide
(d) Calcium hydroxide
Correct answer -
(a) Magnesium hydroxide
Q74. An antacid tablet or syrup is taken to reduce excess
(a) Base in the stomach
(b) Acid in the stomach
(c) Salt in the stomach
(d) Water in the stomach
Correct answer -
(b) Acid in the stomach
Q75. Identify the weak base among the following
(a) NaOH
(b) KOH
(c) NH4OH
(d) Ca(OH)2
Correct answer -
(c) NH4OH
Q76. Which acid is present in tomatoes?
(a) Oxalic acid
(b) Citric acid
(c) Lactic acid
(d) Tartaric acid
Correct answer -
(a) Oxalic acid
Q77. Blue vitriol is the common name of
(a) Copper sulphate
(b) Zinc sulphate
(c) Iron sulphate
(d) Sodium sulphate
Correct answer -
(a) Copper sulphate
Q78. The approximate pH of human blood is
(a) 5.5
(b) 6.0
(c) 7.4
(d) 8.0
Correct answer -
(c) 7.4
Q79. Which of the following represents a strong acid?
(a) CH3COOH
(b) HCl
(c) H2CO3
(d) HCOOH
Correct answer -
(b) HCl
Q80. Which of the following salts will show acidic nature in aqueous solution?
(a) NaCl
(b) NH4Cl
(c) Na2CO3
(d) KCl
Correct answer -
(b) NH4Cl
Q81. Lime water turns milky when a particular gas is passed through it. The gas is
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) Nitrogen
Correct answer -
(c) Carbon dioxide
Q82. Baking soda is chemically known as
(a) Sodium carbonate
(b) Sodium hydrogen carbonate
(c) Sodium hydroxide
(d) Sodium chloride
Correct answer -
(b) Sodium hydrogen carbonate
Q83. On heating baking soda, the main product formed is
(a) Sodium carbonate
(b) Sodium hydroxide
(c) Sodium nitrate
(d) Sodium chloride
Correct answer -
(a) Sodium carbonate
Q84. The sour test of curd is due to the presence of
(a) Acetic acid
(b) Lactic acid
(c) Citric acid
(d) Formic acid
Correct answer -
(b) Lactic acid
Q85. The nature of a solution that turns blue litmus paper red is
(a) Basic
(b) Acidic
(c) Neutral
(d) Saline
Correct answer -
(b) Acidic
Q86. A solution that turns red litmus paper blue is
(a) Acidic
(b) Basic
(c) Neutral
(d) Distilled water
Correct answer -
(b) Basic
Q87. What is the nature of the aqueous solution of sodium carbonate?
(a) Acidic
(b) Basic
(c) Neutral
(d) All
Correct answer -
(b) Basic
Q88. The acid used in car batteries is
(a) Hydrochloric acid
(b) Nitric acid
(c) Sulphuric acid
(d) Acetic acid
Correct answer -
Sulphuric acid
Q89. The pH of lemon juice is close to
(a) 2
(b) 5
(c) 7
(d) 9
Correct answer -(a) 2
Q90. What is the formula of slaked lime?
(a) CaO
(b) Ca(OH)2
(c) CaCO3
(d) CaCl2
Correct answer - (b) Ca(OH)2
Q91. Quick lime is chemically known as
(a) Calcium oxide
(b) Calcium hydroxide
(c) Calcium carbonate
(d) Calcium phosphate
Correct answer - (a) Calcium
oxide
Q92. Which of the following salts is neutral in nature?
(a) NH4Cl
(b) NaCl
(c) Na2CO3
(d) NH4NO3
Correct answer - (b) NaCl
Q93. Identify the natural indicator from the following
(a) Phenolphthalein
(b) Litmus
(c) Methyl orange
(d) China rose
Correct answer - (d) China
rose
Q94. Methyl orange turns which colour in an acidic medium?
(a) Yellow
(b) Pink
(c) Red
(d) Blue
Correct answer - (c) Red
Q95. Methyl orange shows which colour in a basic medium?
(a) Yellow
(b) Pink
(c) Red
(d) Blue
Correct answer - (a) Yellow
Chlor -Alkali Process and Other Important Facts MCQs
Q96. Which gas is obtained at the anode during the chlor-alkali process?
(a) Oxygen
(b) Nitrogen
(c) Chlorine
(d) Hydrogen
Correct answer - (c) Chlorine
Q97. How many molecules of water of crystalline in washing soda?
(a) 5
(b) 7
(c) 10
(d) 2
Correct answer -(c) 10
Q98. What is the nature of salt formed from a strong acid and a strong base?
(a) Acidic
(b) Basic
(c) Neutral
(d) Coloured
Correct answer - (c) Neutral
Q99. The pH scale generally ranges between
(a) 0 -7
(b) 1- 7
(c) 0- 14
(d) 1- 14
Correct answer -(c) 0-
14
Q100. Toothpaste is basic in nature because it helps to
(a) Clean tooth only
(b) Kill germs only
(c) Neutralise acids in the mouth
(d) Provide fragrance
Correct answer - (c) Neutralise
acids in the mouth
Related Topics
1. Important MCQs of Chemical Reactions and Equations
FAQs from Acids, Bases and Salts
Q1. What is the pH range of acids, bases and neutral
substances?
Answer
Acids have a pH less than 7, bases have a pH greater than 7
and neutral substances have a pH equal to 7.
Q2. What happens when an acid reacts with a metal?
Answer
Hydrogen gas is released, and a slat is formed.
Q3. Why is toothpaste basic in nature?
Answer
Toothpaste is basic to neutralise acids present in the
mouth and prevent tooth decay.
Q4. What is washing soda, and its chemical formula?
Answer
Washing soda is sodium carbonate decahydrate with the formula Na2CO3.10H2O.
Q5. What is the chlor-alkali process?
Answer
It is the process of electrolysis of brine to produce
sodium hydroxide, chlorine and hydrogen.
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