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 2022-2023. 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 2022-2023

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

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)
Q2

In which of the following statement is or are incorrect?

[A]. The common indicators cannot tell us the relative strengths of acids or bases.
[B]. To obtain an idea of how acidic or basic a substance is, universal indicator is used.
[C]. Universal indicator is a mixture of many different indicators (or dyes) which gives different colours at different pH values of the entire pH scale.
[D]. If a solution turns universal indicator yellow, then it will be a neutral solution (which is neither acidic nor basic).
Q3

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.
Q4

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
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

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
Q8

Which of the following is used for dissolution of gold?

[A]. Hydrochloride acid
[B]. Sulphuric acid
[C]. Nitric acid
[D]. Aqua- regia
Q9

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

Which one of the following can be used as an acid-base indicator by a visually impaired student?

[A]. Litmus
[B]. Turmeric
[C]. Vanilla essence
[D]. Petunia leaves
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

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

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

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

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

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

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

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.