chemistry MCQs - 10th class Chapter 02 Mcqs

1

According to the Arrhenius concept, a substance that dissociates in an aqueous solution to give hydrogen ions is called?

A

A base

B

An acid

C

A salt

D

An amphoteric substance

2

Which chemist is credited with preparing nitric acid (HNO₃), hydrochloric acid (HCl), and sulphuric acid (H₂SO₄)?

A

Lavoisier

B

Sir Humphrey Davy

C

Jabir Bin Hayan

D

Arrhenius

3

A substance that can accept a proton (H⁺) from another substance is defined as a base by which theory?

A

Arrhenius Concept

B

Bronsted-Lowry Concept

C

Lewis Concept

D

Dalton's Theory

4

What is the product of any Lewis acid-base reaction called?

A

A salt

B

An ion

C

A molecule

D

An adduct

5

Which of the following is an example of a Lewis acid?

A

NH₃

B

R-OH

C

BF₃

D

OH⁻

6

What is the pH of a neutral solution?

A

Less than 7

B

Greater than 7

C

Exactly 7

D

Exactly 0

7

Which of the following acids is found in sour milk?

A

Citric acid

B

Formic acid

C

Lactic acid

D

Butyric acid

8

Acids react with metals like Mg, Zn, and Fe to form their respective salts and evolve which gas?

A

Oxygen

B

Carbon dioxide

C

Hydrogen

D

Nitrogen

9

The reaction between an acid and a base to form a salt and water is called?

A

Displacement

B

Decomposition

C

Neutralization

D

Precipitation

10

What is the chemical formula for Gypsum?

A

CaSO₄

B

CaSO₄.2H₂O

C

CaSO₄.5H₂O

D

CaCl₂

11

A salt formed by the total replacement of ionizable H⁺ ions of an acid by a metal ion is called?

A

Acidic salt

B

Basic salt

C

Normal salt

D

Mixed salt

12

Which type of salt is formed by the incomplete neutralization of a polyhydroxy base by an acid?

A

Acidic salt

B

Basic salt

C

Double salt

D

Complex salt

13

What is Mohr's salt an example of?

A

Normal salt

B

Basic salt

C

Double salt

D

Complex salt

14

What does the 'p' in pH stand for?

A

Positive logarithm

B

Potential of hydrogen

C

Negative logarithm of the symbol

D

Power of hydrogen

15

A solution with a pH of 2 is how many times more acidic than a solution with a pH of 3?

A

10 times

B

100 times

C

2 times

D

1 time

16

Which indicator is colorless in a strongly acidic solution and red in a strongly alkaline solution?

A

Methyl orange

B

Litmus

C

Phenolphthalein

D

Universal indicator

17

The self-ionization of water is also known as?

A

Hydrolysis

B

Auto-ionization

C

Neutralization

D

Dissociation

18

Which of the following is a use for sodium hydroxide (NaOH)?

A

Manufacturing of soap

B

Food preservation

C

Alkaline batteries

D

Fire extinguishers

19

Calcium hydroxide is used for which of the following purposes?

A

Manufacturing explosives

B

Softening of hard water

C

Flavoring food

D

Cleaning metals

20

A substance that can behave as an acid as well as a base is called?

A

Neutral

B

A-polar

C

Amphoteric

D

Isotonic

21

Who proved that hydrogen is the main constituent of all acids?

A

Lavoisier

B

Arrhenius

C

Jabir Bin Hayan

D

Sir Humphrey Davy

22

According to the Lewis concept, a base is a substance that can?

A

Accept a proton

B

Donate a proton

C

Accept a pair of electrons

D

Donate a pair of electrons

23

In the reaction between HCl and H₂O, what is the conjugate base of the acid HCl?

A

H₃O⁺

B

OH⁻

C

Cl⁻

D

H₂O

24

A conjugate acid is a specie formed by?

A

Donating a proton by an acid

B

Accepting a proton by a base

C

Donating an electron pair

D

Accepting an electron pair

25

Which of the following is considered a limitation of the Arrhenius concept?

A

It only applies in aqueous medium

B

It cannot explain bases without OH⁻ ions

C

It cannot explain acids like CO₂

D

All of the above

26

The word 'acid' is derived from the Latin word 'Acidus', which means?

A

Bitter

B

Sour

C

Slippery

D

Corrosive

27

Which acid is used for the preservation of food?

A

Sulphuric acid

B

Nitric acid

C

Benzoic acid

D

Hydrochloric acid

28

What is the pH range for acidic solutions?

A

pH > 7

B

pH < 7

C

pH = 7

D

pH = 14

29

The ionic product constant of water, Kw, has a value of what at 25°C?

A

1.0 x 10⁻⁷

B

1.0 x 10⁻¹⁴

C

1.0 x 10⁷

D

1.0 x 10¹⁴

30

Which salt is used as a foaming agent in fire extinguishers?

A

Sodium hydroxide

B

Magnesium hydroxide

C

Ammonium hydroxide

D

Aluminium hydroxide

31

Insoluble salts are prepared by mixing solutions of?

A

Two insoluble salts

B

Two soluble salts

C

An acid and an insoluble base

D

A metal and water

32

What type of salt is bleaching powder, Ca(OCl)Cl?

A

Double salt

B

Complex salt

C

Mixed salt

D

Basic salt

33

Potassium ferrocyanide, K₄[Fe(CN)₆], is an example of a?

A

Normal salt

B

Acidic salt

C

Double salt

D

Complex salt

34

Which of the following is NOT a property of bases?

A

They have a bitter taste

B

They feel slippery

C

They turn red litmus blue

D

They have a sour taste

35

Reaction of acids with carbonates and bicarbonates produces which gas?

A

Sulphur dioxide

B

Hydrogen sulphide

C

Ammonia

D

Carbon dioxide

36

The central atom in BF₃ has how many electrons around it, making it a Lewis acid?

A

8

B

4

C

6

D

2

37

Which of the following can act as a Lewis base?

A

Ag⁺

B

H⁺

C

NH₃

D

FeCl₃

38

Acetic acid is used for?

A

Manufacturing fertilizers

B

Etching designs on copper

C

Flavoring food and food preservation

D

Cleaning metals

39

Which acid is present in the stings of bees and ants?

A

Malic acid

B

Formic acid

C

Uric acid

D

Tartaric acid

40

What is the colour of methyl orange in a strongly acidic solution?

A

Yellow

B

Red

C

Blue

D

Colourless

41

At what pH does phenolphthalein change its colour?

A

About 7

B

About 4

C

About 9

D

About 2

42

A more reliable and accurate method of measuring pH than Universal Indicator paper is?

A

Litmus paper

B

A pH meter

C

Titration

D

Visual inspection

43

What is the pH of a 0.01M HCl solution?

A

1

B

2

C

12

D

0.01

44

What is the pOH of a 0.001M KOH solution?

A

11

B

3

C

1

D

14

45

A cation derived from a base is called a?

A

Acid radical

B

Basic radical

C

Neutral radical

D

Anion

46

Salts are generally found in what form?

A

Liquid

B

Gaseous

C

Crystalline

D

Amorphous

47

Which of the following is a use for Potassium nitrate (KNO₃)?

A

Drying agent

B

Manufacture of flint glass

C

Softening water

D

Making statues

48

What are chemicals used to prevent food spoilage called?

A

Antioxidants

B

Preservatives

C

Antimicrobials

D

All of the above

49

Acid rain is formed by dissolving acidic air pollutants like oxides of?

A

Carbon and hydrogen

B

Sulphur and nitrogen

C

Sodium and potassium

D

Chlorine and fluorine

50

Which acid is also known as the 'King of Chemicals' and used in lead storage batteries?

A

Nitric acid

B

Hydrochloric acid

C

Sulphuric acid

D

Acetic acid