Which of the following are present in a dilute aqueous solution of hydrochloride acid?

HCl is a strong acid. When HCl is mixed with water, its molecules dissociate completely to furnish H+ ions and Cl– ions. This H+ ion combines with water molecules to produce hydronium ions.

Which of the following statement is true for acids?

Acids turn blue litmus solution to red. They have a sour taste as in case of vinegar and are sticky to touch. On the other side, bases turn red litmus solution to blue. They are bitter in taste as in case of baking soda and are slippery to touch.

Anoop appeared in class test where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

Here, all the statements are correct. Hence, your answer will be option [D].

Match the chemical substances given in “Brackets”.

Firstly, Bleaching powder (CaOCl2) is used bleach clothes and removes colour from clothes. It decomposes on reaction with water and releases chlorine which acts as oxidising, bleaching and disinfecting agent. Baking soda is a natural antacid. It is used to relieve acidity in stomach and heart burn. Washing soda is used in the preparation of glass, soap and paper industries. Sodium chloride is used to produce H2 and Cl2 gases. And lastly, Aqueous sodium chloride on electrolysis yields hydrogen and chlorine.

In which of the following statements is or are incorrect?

The solutions having pH of 4, 5 and 6 are considered to be weak acid solutions.

Pornima is writing some statements but she confused to know whether the statements are correct or not? Would you help her?

Here, all the statements are correct. Hence, your answer will be option [D].

Which among the following is not a base?

C2H5OH is not a base. C2H5OH or ethyl alcohol has a functional OH– group. It cannot dissociate ions in a solution. Thus it cannot be a basic compound.

Consider the given statements and choose the incorrect one:

Sodium oxide (Na2O) is a metal oxide, so it is a base; and sodium hydroxide (NaOH) is a metal hydroxide, so it is also a base.

Nishant is writing some statements but he confused to know whether the statements are correct or not? Would you help him?

Here, all the statements are correct. Hence, your answer will be option [D].

Which of the following is acidic in nature?

Lime juice is acidic in nature. It has high amount of citric acid present in it.

Which of the following substances will not give carbon dioxide on treatment with dilute acid?

Lime (CaO) is the base that reacts with a dilute acid such as HCl to form a salt called “Calcium Chloride”. It is an exothermic reaction and releases water but no carbon dioxide. Mable or limestone (CaCO3) or baking soda (NaHCO3) react with HCl to release CO2.

The pH of the gastric juices released during digestion is

When we eat, our stomach releases hydrochloric acid that helps in digestion. Acids always have pH less than 7.

Parmindar is writing some statements about polyester. In which of the following statements is or are incorrect? Help him.

Generally, acids are stored in containers made of glass and ceramics because they are not attacked by acids. Acids are never stored in metal containers because they gradually corrode and eat up the metal container.

In a science exam, you are asked a question where you have to choose the statement which is/ are incorrect?

Here, all the statements are correct. Hence, your answer will be option [D].

Payal is writing some statements, choose the correct statement and help him:

Here, all the statements are correct. Hence, your answer will be option [D].

Which of the following salts does not contain water of crystallization?

Baking soda does not contain water of crystallization. The chemical formula of baking soda is NaHCO3. Its formula does not show any association with water molecules. Other three contain water of crystallization blue vitriol (CuSO4.5H2O), washing soda (Na2CO3.10H2O) and gypsum (CaSO4.2H2O).

Class 10 Science Chapter 2 MCQ of Acids, Bases and Salts for 2025-26

Updated on January 27, 2022
by Tiwari Academy

Class 10 Science Chapter 2 MCQ (Multiple Choice Questions) of Acids, Bases and Salts. All the MCQs are taken from NCERT Textbooks issued for session 2025-26. Answers and explanation of MCQ tests are given just below each questions. MCQs are important for the CBSE and other boards final exams. It also clears the concepts about Acids, Bases and salts. So, practice here with MCQ test and prepare for school exams and board exams.

Class 10 Science Chapter 2 MCQ with Answers

Class: 10	Science
Chapter: 2	MCQ (Multiple Choice Questions) test

Class 10 Science Chapter 2 MCQ Test 2025-26

CBSE Class 10 Science Chapter 2 MCQ tests with answer and complete explanation of each answer. MCQs are important for most of the boards like UP Board, Bihar Board, MP Board as well as CBSE board. So, prepare your chapter with the following 20 sets of MCQs containing about 100 questions.

Paheli is writing some statements. She wants to know in which of the following statements is or are correct?

[A]. When a person happens to touch the leaves of a nettle plant accidently, the stinging hair of nettle leaves inject methanoic acid into the skin of the person causing burning pain.

[B]. An ant’s sting injects methanoic acid into the skin of a person causing burning pain.

[C]. When a wasp stings, it injects an alkaline liquid into the skin.

[D]. All the above

Identify the correct representation of reaction occurring during chloralkali process

[A]. 2NaCl(l) + 2H2O(l) → 2NaOH(l) + Cl2(g) + H2(g)

[B]. 2NaCl(aq) + 2H2O(aq) → 2NaOH(aq) + Cl2(g) + H2(g)

[C]. 2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(aq) + H2(aq)

[D]. 2NaCl (aq) + 2H2O (l) → 2NaOH (aq) + Cl2(g) + H2(g)

Consider the following statements, choose the incorrect one:

[A]. Dilute hydrochloric acid causes indigestion of food.

[B]. Tooth decay starts when the pH of acid formed in the mouth falls below 5.5.

[C]. Being basic in nature, antacids react with excess acid in the stomach and neutralize it.

[D]. The bacteria present in our mouth break down the sugar to form acids (such as lactic acid).

Which of the following is/are true when HCl (g) is passed through water?

[A]. It does not ionise in the solution as it is a covalent compound.

[B]. It gives both hydrogen and hydroxyl ion in the solution.

[C]. It ionises in the solution, and it forms hydronium ion in the solution due to the combination of hydrogen ion with a water molecule.

[D]. It gives both hydrogen and hydroxyl ion in the solution, and it forms hydronium ion in the solution due to the combination of hydrogen ion with a water molecule.

Equal volumes of hydrochloric acid and sodium hydroxide solution 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 of NCERT Book (Science Class X) on page 26).

[A]. Red

[B]. Yellow

[C]. Yellowish green

[D]. Blue

The property which is not shown by acids is:

[A]. They have sour taste

[B]. They feel soapy

[C]. They turn litmus red

[D]. Their pH is less than seven

Which of the following is used for dissolution of gold?

[A]. Hydrochloride acid

[B]. Sulphuric acid

[C]. Nitric acid

[D]. Aqua- regia

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 of HCl solution (the same solution as before) required to neutralize it will be:

[A]. 4 mL

[B]. 8 mL

[C]. 12 mL

[D]. 16 mL

Which of the following statement is or are correct?

[A]. Sulphuric acid (H2SO4) and nitric acid (HNO3) are also weak acids.

[B]. Carbonic acid (H2CO3) and sulphurous acid (H2SO3) are also strong acids.

[C]. Strong acids also have a low electrical conductivity.

[D]. An acid which is partially ionised in water and thus produces a small amount of hydrogen ions is called a weak acid.

Q10

Mohan is writing some statements, choose the incorrect statements and help him:

[A]. In the absence of water, a substance will not form hydrogen ions and hence will not show its acidic behaviour.

[B]. Hydrochloric acid is completely ionised in water, so it is a weak acid.

[C]. Dry, HCl gas does not change the colour of dry blue litmus paper because it has no hydrogen ions.

[D]. The HCl gas turns ‘wet’ blue litmus paper red because it dissolves in the water present in wet litmus paper to form hydrogen ions.

Q11

Which of the following phenomena occur when a small amount of acid is added to water?

[A]. Ionisation, Neutralisation

[B]. Ionisation, Dilution

[C]. Neutralisation, Dilution

[D]. Neutralisation, Formation

Q12

Consider the following statements, choose the incorrect one:

[A]. The strong bases (or alkalis) such as sodium hydroxide are also very corrosive, and attack and destroy our skin.

[B]. An acid is a substance which dissociates on dissolving in water to produce hydrogen ions.

[C]. The compounds such as glucose and alcohol also contain hydrogen but they do not show acidic character.

[D]. Only sulphuric acid and hydrochloric acid solution conducts electricity.

Q13

Which of the following statements is correct about an aqueous solution of an acid and a base?

[A]. Higher the pH, stronger the acid, and Lower the pH, stronger the base.

[B]. Higher the pH, weaker the acid, and Lower the pH, stronger the base.

[C]. Higher the pH, stronger the acid, and Lower the pH, weaker the base.

[D]. Higher the pH, weaker the acid, and Lower the pH, weaker the base.

Q14

Consider the following statements and choose the correct statement(s):

[A]. Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride, carbon dioxide and water.

[B]. Calcium carbonate reacts with dilute sulphuric acid to form calcium sulphate, carbon dioxide and water.

[C]. When hydrochloric acid reacts with sodium hydroxide solution, then a neutralisation reaction takes place to form sodium chloride and water.

[D]. All the above

Q15

One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

[A]. Hydrochloric acid

[B]. Tartaric acid

[C]. Acetic acid

[D]. Sulphuric acid

Q16

Common salt besides being used in kitchen can also be used as the raw material for making:

[A]. Washing soda, Bleaching soda

[B]. Washing soda, Bleaching soda, Slaked lime

[C]. Washing soda, Bleaching soda, Baking soda

[D]. Washing soda, Baking soda, Slaked lime

Q17

Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?

[A]. It turns lime water milky, and it extinguishes a burning splinter.

[B]. It turns lime water milky, and it extinguishes a burning splinter, and it dissolves in a solution of sodium hydroxide.

[C]. It extinguishes a burning splinter, it dissolves in a solution of sodium hydroxide, and it has a pungent odour.

[D]. It turns lime water milky, and it has a pungent odour.

Q18

Which of the following statement is or are incorrect?

[A]. The acids present in plants materials and animals are called organic acids.

[B]. Organic acids are weak acids, so it is not harmful to eat or drink.

[C]. The acids prepared from the minerals of the earth are called mineral acids.

[D]. Concentrated mineral acids are weak acids, so they are not very dangerous.

Q19

If a few drops of concentrated acid accidentally spill over the hand of a student, what should be done?

[A]. Wash the hand with saline solution.

[B]. Wash the hand immediately with plenty of water and apply a paste of sodium hydrogen carbonate.

[C]. After washing with plenty of water apply solution of sodium hydroxide on the hand.

[D]. Neutralise the acid with a strong alkali.

Q20

Which of the following gives the correct increasing order of acid strength?

[A]. Water < acetic acid < hydrochloride acid.

[B]. Water < hydrochloride acid < acetic acid.

[C]. Acetic acid < water < hydrochloride acid.

[D]. Hydrochloride acid < water < acetic acid.

Q21

Consider the following statement and choose the incorrect one:

[A]. An indicator is a dye that changes colour when it is put into an acid or a base.

[B]. The most common indicators to test for acids and bases are litmus, methyl orange and phenolphthalein.

[C]. The most common indicator used for testing acids and bases in the laboratory is phenolphthalein.

[D]. None of the above

Q22

Calcium phosphate is present in tooth enamel. Its nature is

[A]. Basic

[B]. Acidic

[C]. Neutral

[D]. Amphoteric

Q23

Sodium carbonate is a basic salt because it is a salt of:

[A]. Strong acid and strong base

[B]. Weak acid and weak base

[C]. Strong acid and weak base

[D]. Weak acid and strong base

Q24

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

[A]. Baking Powder

[B]. Lime

[C]. Ammonium hydroxide solution

[D]. Hydrochloric acid

Q25

During the preparations of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of the calcium chloride taken in the guard tube is to:

[A]. Absorb the evolved gas.

[B]. Moisten the gas.

[C]. Absorb moisture from the gas.

[D]. Absorb Cl- ions from the evolved gas.

Start a New Test

Find the correct answer of MCQ

Consider the following statements and choose the incorrect one:

[A] The red cabbage extract is also a natural indicator.
[B] The red cabbage extract remains red in acidic solution, but turns green on adding two basic solution.
[C] Those substances whose smell changes in acidic or basic solution are called olfactory indicators.
[D] The smell of the onion cannot be detected when it is added to an acidic solution.

ANSWER: [D]
Explanation: Onion has a characteristic smell. An acidic solution like hydrochloric acid, does not destroy the smell of onions. When a basic solution like sodium hydroxide solution is added to a cloth strip treated with onions, then the onions smell cannot be detected.

Find the correct answer of MCQ

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?

[A] Lemon Juice
[B] Vinegar
[C] Common salt
[D] An antacid

ANSWER: [D]
Explanation: Lemon juice is primarily a rich source of vitamin C which is citric acid.
Vinegar is a mixture of acetic acid and water. It is produced by acid acting bacteria. It is a mild acid.
Common salt is sodium chloride which has sodium ions and chloride ions. So, these three cannot change the pH paper to greenish blue as only base can bring this change.
Antacid is a base which is baking soda or sodium bicarbonate or sodium hydrogen carbonate which can change the pH paper from yellow orange to green while others are acidic in nature.

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Last Edited: January 27, 2022