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 statement is or are incorrect?

Most of the plants grow best when the pH of the soil is close to 7. If the soil is too acidic or too basic (too alkaline), the plants grow badly or do not grow at all. The soil may be acidic or basic naturally. The soil pH is also affected by the use of chemical fertilizers in the fields. The pH of acidic soil can reach as low as 4 and that of the basic soil can go up to 8.3. Chemicals can be added to soil to adjust its pH and make it suitable for growing plants.

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.

In which of the following statement is or are incorrect?

If a solution turns universal indicator green, then it will be a neutral solution (which is neither acidic nor basic). Thus, water will produce a green colour with universal indicator.

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 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.

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.

In which of the following statement is or are incorrect?

The hydrogen containing compounds like glucose and alcohol do not produce hydrogen ions or some other ions in solution. So, due to the absence of ions, glucose solution and alcohol solution do not conduct electricity.

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.

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

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

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].

Which of the following statement is or are incorrect?

The acids prepared from the minerals of the earth are called mineral acids. Mineral acids are manmade acids. The three most common mineral acids are: Hydrochloric acid, Sulphuric acid and Nitric acid. Concentrated mineral acids are very dangerous. They can burn our hands and clothes. These acids should be handled with care.

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].

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

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

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.

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.

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).

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.

Which among the following is not a base?

[A]. NaOH

[B]. KOH

[C]. NH4OH

[D]. C2H5OH

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

Q10

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.

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

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

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

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

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

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.

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Last Edited: January 27, 2022