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.

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.

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.

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.

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 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.

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].

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.

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

The increasing order of acid strength is water < acetic acid < hydrochloride acid. Hydrochloride acid is a mineral acid and ionises completely in water. That’s why it is a strong acid. Acetic acid is an organic acid and ionises only partially in water. That’s why it is a weak acid. Water is almost neutral in nature. In pure water number of positive hydrogen ions is equal to the negative ions.

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].

Calcium phosphate is present in tooth enamel. Its nature is

Calcium phosphate Ca3(PO4)2 is basic salt, as it is formed by the combination of a weak acid (phosphoric acid) and slightly stronger base (calcium hydroxide). Bacteria feed on sugars commonly found in foods and produce acids in the mouth decreasing the pH level to 5.5 or lower. Thus, eroding the enamel that is basic in nature.

Class 10 Science Chapter 2 MCQ of Acids, Bases and Salts for 2024-25

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 2024-25. 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 2024-25

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)

Which of the following statement is or are incorrect?

[A]. Our body works well within a narrow pH range of 7.0 to 7.8.

[B]. When the pH of rain water is about 5.6, it is called acid rain.

[C]. If the soil is too acidic (having low pH), then it is treated with materials like quicklime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate).

[D]. Most of the plants grow best when the pH of the soil is close to 4.

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

[A]. Hydrochloric acid is strong acid.

[B]. Sodium Hydroxide is a strong base.

[C]. Acetic acid is weak acid.

[D]. Magnesium hydroxide is a strong base.

Consider the following statement and choose the incorrect one:

[A]. Pure water is neutral, the concentrations of hydrogen ions and hydroxide ions are equal.

[B]. Acidic solutions have excess of hydrogen ions.

[C]. The basic solutions have excess of hydroxide ions.

[D]. A solution having a high concentration of hydrogen ions has a high pH value.

Consider the given statements and choose the incorrect one:

[A]. Bases are those chemical substances which have a bitter taste.

[B]. A base is a chemical substance which can neutralise an acid.

[C]. Bases are the chemical opposites of acids.

[D]. Sodium oxide (Na2O) is a metal oxide, so it is an acidic in nature.

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 acidic in nature?

[A]. Lime juice

[B]. Human blood

[C]. Baking soda

[D]. Antacid

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

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

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

[A]. Dilute hydrochloric acid reacts with copper (II) oxide to form copper (II) chloride and water.

[B]. Acids are never stored in metal containers or glass and ceramics because they gradually corrode and eat up the metal container.

[C]. The reaction between acids and metal oxides is a kind of “Neutralization reaction”.

[D]. Milk of Magnesia is a metal hydroxide called ‘magnesium hydroxide’ which is used to remove indigestion caused too much hydrochloric acid in the stomach.

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

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

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

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

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.

Q20

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.

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

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

Q23

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

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.

« Class 10 Science Chapter 1 MCQ

Class 10 Science Chapter 3 MCQ »

Last Edited: January 27, 2022