Identify the correct representation of reaction occurring during chloralkali process

Chloralkali is a process used in industries to produce chlorine and sodium hydroxide (caustic soda). This happens by the electrolysis of NaCl (commonly known as brine).

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.

Consider the following statements, choose the incorrect one:

Our stomach produces hydrochloric acid (of pH about 1.4). This dilute hydrochloric acid helps in digesting our food without harming the stomach. Sometimes, excess of acid is produced in the stomach due to various reasons. The excess acid in the stomach causes indigestion which produces pain and irritation.

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.

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

Magnesium hydroxide is a weak base. Rest of all the statements are correct. Hence, your answer will be option [D].

Consider the following statement and choose the incorrect one:

The pH of a solution is inversely proportional to the concentration of hydrogen ions in it. That is, a solution having a high concentration of hydrogen ions has a low pH value. On the other hand, a solution having low concentration of hydrogen ions has a high pH value.

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.

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.

The property which is not shown by acids is:

All the options are characteristics of acids except one. They feel soapy. Hence, your answer will be option [B].

Which of the following is used for dissolution of gold?

Aqua-regia is used for the dissolution of gold. It is a solution of concentrated HNO3 and concentrated HCl in the ratio of 1:3. Thus this solution is strongly acidic and is used to dissolve gold.

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 statement is or are correct?

Here, all the statements are incorrect except one. Hence, your answer will be option [D]. Sulphuric acid (H2SO4) and nitric acid (HNO3) are also strong acids. Carbonic acid (H2CO3) and sulphurous acid (H2SO3) are also weak acids. Strong acids also have a high electrical conductivity.

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

An acid which is completely ionised in water and thus produces a large amount of hydrogen ions is called a strong acid. For example, hydrochloric acid is completely ionised in water, so it is a strong acid.

Consider the following statements, choose the incorrect one:

All the acid solutions conduct electricity. Here, all the statements are correct except one. Hence, your answer will be option [D].

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.

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

Baking powder is a mixture of baking soda NaHCO3 (sodium hydrogen carbonate) and a mild edible acid such as tartaric acid. When baking powder is mixed with water, sodium hydrogen carbonate reacts with tartaric acid and accepts hydrogen ions from it. This process releases carbon dioxide gas which is trapped in the dough when baking powder is used to make bread and cake.

Consider the following statement and choose the incorrect one:

The most common indicator used for testing acids and bases in the laboratory is litmus. Litmus can be used in the form of litmus solution or in the form of litmus paper. It is of two types blue litmus and red litmus.

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

The aqueous solution is a base as it turns red litmus solution blue. An acidic solution such as hydrochloric acid (HCl) would reverse the change. In contrast, hydrochloric acid would turn blue litmus solution to red.

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

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.

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?

[A]. The strength of an acid or base is measured on a scale of numbers called the pH scale.

[B]. A substance having pH 7 will have no effect on litmus or any other common indicator such as methyl orange or phenolphthalein, etc.

[C]. A sugar solution and sodium chloride solution are also neutral, each having a pH of 7.

[D]. None of the above.

In which of the following statements is or are incorrect?

[A]. The solutions having pH values of 8, 9 and 10 are usually considered weak bases (or weak alkalis).

[B]. The solutions having pH values of 11, 12, 13, and 14 are usually considered strong bases (or strong alkalis).

[C]. The solutions having pH of 0, 1, 2 and 3 are usually considered to be strong acids.

[D]. The solutions having pH of 4, 5 and 6 are considered to be neutral solutions.

Which of the following statements is not correct?

[A]. All metal carbonates react with acid to give a salt, water and carbon dioxide.

[B]. All metal oxides react with water to give salt and acid.

[C]. Some metal reacts with acids to give salt and hydrogen.

[D]. Some non-metal oxides react with water to from an acid.

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

[A]. Metal carbonates and metal hydrogen carbonates are also considered to be bases.

[B]. Sodium hydroxide is a base because it dissolves in water to produce hydroxide ions (alongwith sodium ions).

[C]. When the solution of a base is diluted by mixing more water in it, then the concentration of hydroxide ions (OH– ions) per unit volume decreases.

[D]. All the above.

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

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

[A]. Sulphuric acid is used in the manufacture of fertilisers, paints, dyes, chemicals, plastics, synthetic fibres etc.

[B]. Nitric acid is used for making fertilisers, explosives etc.

[C]. Hydrochloric acid is used for removing oxide film from steel objects and used in dye-stuffs, textile, food and leather industries.

[D]. All the above.

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

[A]. Marble

[B]. Limestone

[C]. Baking soda

[D]. Lime

Q10

In which of the following statement is or are incorrect?

[A]. Rain water conducts electricity.

[B]. Distilled water does not conduct electricity.

[C]. Glucose solution conduct electricity.

[D]. Alcohol solution also does not conduct electricity.

Q11

The pH of the gastric juices released during digestion is

[A]. Less than 7

[B]. More than 7

[C]. Equal to 7

[D]. Equal to 0

Q12

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.

Q13

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

Q14

To protect tooth decay we are advised to brush our teeth regularly. The nature of toothpaste commonly used is

[A]. Acidic

[B]. Neutral

[C]. Basic

[D]. Corrosive

Q15

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

[A]. Curd and other sour foodstuffs such as vinegar, lemon juice and orange juice, etc., should not be kept in metal vessels like copper vessels.

[B]. If someone is suffering from the problem of acidity after over eating, we can suggest taking baking soda solution as remedy.

[C]. Egg-shells, limestone, marble and chalk are the different forms calcium carbonate.

[D]. None of the above

Q16

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

[A]. The solutions of all the acids conduct electricity.

[B]. When carbon dioxide gas is passed through lime water, the lime water turns milky due to the formation of a white precipitate of sodium hydrogen-carbonate.

[C]. When dilute hydrochloric acid reacts with sodium carbonate, then sodium chloride, carbon dioxide and water are formed.

[D]. When dilute sulphuric acid reacts with zinc metal, then zinc sulphate and hydrogen gas are formed.

Q17

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

Q18

Sukhvir appeared in test of class 10th standard, where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

[A]. A concentrated acid is one which contains the minimum possible amount of water in it.

[B]. A dilute acid is one which contains the much more amount of water in it.

[C]. When water is added to concentrated acid to dilute it then the heat is evolved gradually.

[D]. None of them

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

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

[A]. Sodium hydroxide solution turns red litmus to blue, so sodium hydroxide solution is basic in nature.

[B]. Methyl orange indicator gives red colour in acid solution, and yellow colour in basic solution.

[C]. Phenolphthalein indicator gives colourless in acid solution, and pink colour in basic solution.

[D]. All 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

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

[A]. Blue vitriol

[B]. Baking soda

[C]. Washing soda

[D]. Gypsum

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