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 2023-24. 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: 2MCQ (Multiple Choice Questions) test

Class 10 Science Chapter 2 MCQ Test 2023-24

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.

Q1

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.
Q2

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

[A]. H3O+ + Cl-
[B]. H3O+ + OH-
[C]. Cl- + OH-
[D]. Unionised HCl
Q3

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).
Q4

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.
Q5

Match the chemical substances given in “Brackets”.

[A]. Bleaching powder (Production of H2 and Cl2), Baking soda (Preparation of glass), Washing soda (Antacid), Sodium chloride (Decolorization).
[B]. Bleaching powder (Decolorization), Baking soda (Production of H2 and Cl2), Washing soda (Antacid), Sodium chloride (Preparation of glass).
[C]. Bleaching powder (Decolorization), Baking soda (Antacid), Washing soda (Preparation of glass), Sodium chloride (Production of H2 and Cl2).
[D]. Bleaching powder (Production of H2 and Cl2), Baking soda (Antacid), Washing soda (Preparation of glass), Sodium chloride (Decolorization).
Q6

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.
Q7

Which of the following is used for dissolution of gold?

[A]. Hydrochloride acid
[B]. Sulphuric acid
[C]. Nitric acid
[D]. Aqua- regia
Q8

Which among the following statement(s) is/are correct? In an attempt try to demonstrate electric conductivity through an electrolyte, by using 6-volt battery, bulb, switch, beaker, nail, dilute NaOH solution, rubber cock.

[A]. Bulb will not glow because electrolyte is not acidic, Bulb will not glow because circuit is incomplete.
[B]. Bulb will glow because NaOH is a strong base and furnishes ions for conduction, Bulb will not glow because it depends upon the type of electrolytic solution.
[C]. Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
[D]. Bulb will not glow because it depends upon the type of electrolytic solution.
Q9

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.
Q10

Which of the following is acidic in nature?

[A]. Lime juice
[B]. Human blood
[C]. Baking soda
[D]. Antacid
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

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
Q13

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.
Q14

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.
Q15

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
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

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
Q18

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.
Q19

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.
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

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

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
Q23

Calcium phosphate is present in tooth enamel. Its nature is

[A]. Basic
[B]. Acidic
[C]. Neutral
[D]. Amphoteric
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

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

[A]. Blue vitriol
[B]. Baking soda
[C]. Washing soda
[D]. Gypsum
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.

Last Edited: January 27, 2022