Chemistry Practice Tests 4 - PLS Academy

Chemistry Practice Test 4

Chemistry Practice Test 4 is designed to help students strengthen their understanding of key chemistry concepts, formulas, and reactions for competitive entry tests like MDCAT, NUMS, AKU, UET, ECAT, NTS, as well as FSC Board Exams. This test covers topics from electrochemistry, redox reactions, solutions, and molarity calculations, helping students improve accuracy and problem-solving skills.

PLS BoostPLS Academy Bundle

Get Access to 20 thousands+ MCQs Including Topical MCQs, Practice Tests, Mock Tests, Solved Past Papers, Flashcards, Notes, FLPS, and Much More.

UNLOCK PREMIUM🔐

733

Created by Ali Durrani

NET Practice

Chemistry Practice Test 4

This is the Free Access to Limited MCQs. Enroll to PLS Boost Premium Bundle to Get More MCQs HERE

1 / 100

Category: Chemistry Ch 13 Class 12

Which of the following is used as coagulation for latex in rubber industry

Acetic acid

Amino acid

Ethyl alcohol

Rayon

2 / 100

Category: Chemistry Ch 8 Class 12

20 cm3 of a gaseous hydrocarbon was completely burnt in an excess of oxygen 60 cm3 of carbon dioxide and 40 cm3 of water vapours were formed, all volumes being measured at the same temperature and pressure. What is the formula of the hydrocarbon?

PreMedPK MDCAT Mock 5
Chemistry
Hydrocarbons
Elimination Tool:

A) C2H6

B) C3H4

C) C3H6

D) C3H8

3 / 100

Category: Chemistry

Q.131 BH3 has a geometry with H-B-H bond angles of 12

A. Linear

B. Tringonal planar

C. Tetrahedron

D. Bent

4 / 100

Category: Chemistry

Q.126 What is the coordination number of Pt in [PtCINO2)NH3)4]

A. 2

B. 4

C. 6

D. 7

5 / 100

Category: Chemistry

Q.38 Water is considered as a Universal solvent because of which properties?

A. Polar nature of water

B. H-bonding

C. Electronegativity difference

D. All are correct

6 / 100

Category: Chemistry Ch 10 Class 11

In electrochemical series, elements are arranged in order of their standard electrode potentials, the correct decreasing reactivity order for metals is:

NTS 2018
Chemistry
Electrochemistry
Elimination Tool:

A) Gold, silver, magnesium, aluminum

B) Mercury, calcium, sodium, magnesium

C) Sodium, aluminum, lead, copper

D) Potassium, silver, magnesium, aluminum

7 / 100

Category: Chemistry

To avoid the formation of toxic compounds with chlorine, which substance is used for disinfecting water?

NUMS Mock 1
Chemistry
s and p Block Elements

A) KMnO4

B) Chloramines

C) O3

D) Alums

8 / 100

Category: Chemistry Ch 8 Class 12

How many chain isomers are shown by C5H12?

NTS 2018
Chemistry
Hydrocarbons
Elimination Tool:

A) 5

B) 4

C) 3

D) 2

9 / 100

Category: Chemistry

When was electron discovered?

1897

1909

1896

None of these

10 / 100

Category: Chemistry Ch 2 Class 12

Aqueous solution of Na2CO3is:

NTS 2011
Chemistry
s and p Block Elements
Elimination Tool:

A) Acidic

B) Alkaline

C) Both Acidic and Alkaline

D) Neutral

11 / 100

Category: Chemistry

Q.95 Wholar first time prepare urea in laboratory in ?

A. 1900

B. 1829

C. 1850

D. 1828

12 / 100

Category: Chemistry Ch 15 Class 12

1500•degree Celsius furnace temperature Is maintained at which zone?

Heating

Burning

Decomposition

Roth b and c

13 / 100

Category: Chemistry Ch 11 Class 12

Ethers are very good:

Solvent

Oxidizing agen

Reducing agent

Dehydrating agent

14 / 100

Category: Chemistry Ch 9 Class 11

12% W/W alcohol In water solution contains water:

100 cm3

12 cm3

88 cm3

112 cm3

15 / 100

Category: Chemistry

Q.35 Instantaneous dipole is produced when

A. Two polar molecules come closer

B. Two non-polar molecules comes closer

C. Polar and nonpolar molecule comes closer

D. All of these

16 / 100

Category: Chemistry Ch 11 Class 12

Propane-1 of when combines with FICI In the presence of ZnCl2, It gives:

1- Clifiropropane

2- Chloropropane

Dichloropropane

1-Cholropropene

17 / 100

Category: Chemistry Ch 15 Class 12

In Paper industry, sodium sulphite is buffered with

Sodium carbonate

Sodium hydroxide

Sodium acetate

Both a and b

18 / 100

Category: Chemistry Ch 11 Class 12

Which of the following is not a derivative of benzene?

PMC Practice 1
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) Pyrrole

B) Furan

C) Thiophene

D) All

19 / 100

Category: Chemistry Ch 15 Class 12

The unpolluted natural rainwater is slightly acidic due to the reaction of rain water with:

UHS 2011
Chemistry
Environmental Chemistry
Elimination Tool:

A) Sulphur dioxide

B) Oxides of nitrogen

C) Carbon dioxide

D) Hydrogen present in air

20 / 100

Category: Chemistry Ch 1 Class 12

Which group of elements shows greatest electrical conductivity?

Alkali metals

Alkaline earth metals

Halogens

Coinage Metals

21 / 100

Category: Chemistry Ch 3 Class 12

Borax bead test is used to separate:

) Metallic cations

Non-metallic cations

Metallic anions

Non-metallic anions

22 / 100

Category: Chemistry Ch 5 Class 11

Which orbitals always possess same energy:

Hybrid orbitals

Degenerate orbitals

None of these

Both a and b

23 / 100

Category: Chemistry Ch 1 Class 12

What is the charge on a hydrogen ion?

— 1

-2

24 / 100

Category: Chemistry Ch 7 Class 12

An essential condition for the Optical Activity of an organic compound is:

NUMS 2015
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Dextrorotatory

B) Levorotatory

C) Presence of an asymmetric carbon

D) Molecular dysymmetry

25 / 100

Category: Chemistry

Q.107 I is an example of___________?

A. Electrophilic group

B. Nucleophile

C. Leaving group

D. Both nucleophile and leaving group

26 / 100

Category: Chemistry Ch 3 Class 11

Which of the following is constant during an isothermal process?

Volume

Pressure

Temperature

Both b and c

27 / 100

Category: Chemistry Ch 9 Class 11

Human blood maintains its pH between

UHS 2016
Chemistry
Solution and Colloids
Elimination Tool:

A) 6.50 – 7.00

B) 7.20 – 7.25

C) 7.50 – 7.55

D) 7.35 – 7.40

28 / 100

Category: Chemistry Ch 1 Class 12

Smallest element in the periodic table is?

Hydrogen

Fluorine

Lithium

Uranium

29 / 100

Category: Chemistry Ch 5 Class 11

If an electron jumps from fourth to first orbit, which of the following series will it show?

Lyman

Balmer

Pfund

None of these

30 / 100

Category: Chemistry

Impurities of lead in silver are removed by:

NUMS Mock 2
Chemistry
d and f Block Elements

A) Parke’s process

B) Solvay process

C) Cyanide process

D) Amalgamation process

31 / 100

Category: Chemistry Ch 7 Class 12

The type of isomerism existing in a compound of molecular formula C2H6O is:

PMC 2020
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Functional group

B) Position

C) Chain

D) Metamerism

32 / 100

Category: Chemistry Ch 11 Class 11

Half-life of iron is? (A=59)

44.5 days

1.3 million years

3.8 days

2.5 billion years

33 / 100

Category: Chemistry

The shape of CO2 molecule is similar to:

NUMS Mock 2
Chemistry
Chemical Bonding

A) H2S

B) SO2

C) SnCl2

D) BeF2

34 / 100

Category: Chemistry Ch 3 Class 11

Real gases deviate significantly from ideal gas behavior at

Low temperature and high pressure

High temperature and low pressure

None of these

Noth a and b

35 / 100

Category: Chemistry Ch 9 Class 11

Ca(OH)2 is sparingly soluble having solubility value 6.5 x 10-6. What’ll be its solubility:

UHS 2017 Reconduct
Chemistry
Solution and Colloids
Elimination Tool:

A) 2.75 x 10-2

B) 2.75 x 102

C) 1.17 x 10-2

D) 3.63 x 103

36 / 100

Category: Chemistry Ch 5 Class 11

For a multi-electron atom, the highest energy level among the following is:

NTS 2013
Chemistry
Atomic Structure
Elimination Tool:

A) n = 5, l = 0, m = 0 , s = + ½

B) n= 4 , l = 0 , m = 0 , s = – ½

C) n= 3 , l = 1, m = 1 , s = – ½

D) n= 5 , l = 1 , m = 0 , s = + ½

37 / 100

Category: Chemistry Ch 12 Class 12

Formaldehyde is Industrially Prepared from:

Methanol

Ethyl alcohol

Methyl alcohol

Oxidation of ethylene

38 / 100

Category: Chemistry

Which of the following solids is an example of a substance with a macromolecular structure?

NUMS Mock 4
Chemistry
States of Matter – Gases, Liquids and Solids

A) Aluminium chloride

B) Ice

C) Magnesium oxide

D) Silicon (IV) oxide

39 / 100

Category: Chemistry

Q.135 If pressure and volume of a gas are Variable while temperature remains constant, this belongs to

A. Charles's law

B. Boyle's law

C. Avogadro's law

D. Pascal's law

40 / 100

Category: Chemistry Ch 6 Class 12

Number of unpaired electrons in ferrous ion is:

41 / 100

Category: Chemistry Ch 5 Class 11

Diameter of Hydrogen atom is?

105.8 x 10-2 A

1.061 A

0.55 A

131.3 x 10-2A

42 / 100

Category: Chemistry Ch 12 Class 12

In Cannizzaro’s reaction, Benzyl alcohol is obtained from?

PreMedPK MDCAT Mock 4
Chemistry
Alcohols, Phenols and Ethers
Aldehydes and Ketones
Elimination Tool:

A) benzaldehyde

B) benzene

C) picric acid

D) benzyl chloride

43 / 100

Category: Chemistry

The potential difference of an electrochemical cell is measured by:

NUMS Mock 2
Chemistry
Electrochemistry

A) Ammeter

B) Voltmeter

C) Galvanometer

D) Calorimeter

44 / 100

Category: Chemistry Ch 3 Class 11

The Unit cell with crystallographic dimensions a = b ≠c ,α = β = γ = 90 degrees is:

NTS 2015 DUHS and JSMU
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Cubic

B) Tetragonal

C) Monoclinic

D) Hexagonal

45 / 100

Category: Chemistry Ch 1 Class 11

Formula mass is considered for compounds instead of their molecular mass.

PMC Practice 21
Chemistry
Introduction to Fundamental Concepts of Chemistry
Elimination Tool:

A) Metallic

B) Ionic

C) Covalent

D) Polar covalent

46 / 100

Category: Chemistry Ch 14 Class 12

A catalyst catalyzes reaction by:

Providing new path for reaction

) Increasing activation energy

Reacting with the reactants

Producing free Ions

47 / 100

Category: Chemistry Ch 8 Class 11

Equilibrium constant has no units if?

The number moles are same on both sides of the chemical equation

The number of moles is different on both sides.

The number of moles is greater in the product

If the rate of reaction is constant

48 / 100

Category: Chemistry

Q.89 Iftwo substituents are present at 1,4 positions then the isomer is called As____________?

A. Ortho

B. Meta

C.Para

D.None of these

49 / 100

Category: Chemistry Ch 5 Class 11

The charge on one proton is:

NUMS 2019 Reconduct
Chemistry
Atomic Structure
Elimination Tool:

A) 1.602 x 10-31C

B) 1.602 x 10-27C

C) 1.602 x 10-19C

D) 1.602 x 10-11C

50 / 100

Category: Chemistry

Q.115 Alcohols can be oxidized to aldehyde and ketone by warming with acidified potassium dichromate. Which among of the following alcohols resists to this change

A. (CH3)2 CH CH2OH

B. CH3 CH2 CH(CH3) OH

C. (CH3)3 COH

D. C6H3 CH2 OH

51 / 100

Category: Chemistry

For a sub shell I = 2 and m = -2, -1, 0 , +1, +2, it implies that it has ____ space orientation.

NUMS Mock 4
Chemistry
Atomic Structure

A) One

B) Two

C) Three

D) Five

52 / 100

Category: Chemistry Ch 4 Class 12

The shape of [Co(NH3)6]3+ complex is:

UHS 2018
Chemistry
d and f Block Elements
Elimination Tool:

A) Linear

B) Square planar

C) Tetrahedral

D) Octahedral

53 / 100

Category: Chemistry Ch 15 Class 12

Which of the following would react with ozone in the atmosphere?

UHS 2018
Chemistry
Environmental Chemistry
Elimination Tool:

A) F*

B) O2

C) O*

D) Cl*

54 / 100

Category: Chemistry

Q.167 The number of charges present on a cation depends on number of electrons______________ by the atom

A . Gain

B. Lost

D. Produced

55 / 100

Category: Chemistry Ch 10 Class 12

atalyst used in the preparation of alkyl halide from alcohol

Platinum/charcoal

LiH4

Rock salt

ZnCl2

56 / 100

Category: Chemistry Ch 8 Class 11

Purification of table salt (NaCl) by passing HCl gas through its saturated aqueous solution is an example of:

PMC 2020
Chemistry
Chemical Equilibrium
Elimination Tool:

A) Law of mass action

B) Hess’s law

C) Common ion effect

D) Henry’s law

57 / 100

Category: Chemistry Ch 2 Class 11

The process of changing a solid directly into gas upon heating is known as:

Sublimation

Liquefaction

Condensation

None of these

58 / 100

Category: Chemistry

Q.149 There are just only a few stable compounds, formed by noble gases like

A. XeF2

B. XeOF2

C. Xe3

D. All of these

59 / 100

Category: Chemistry Ch 5 Class 12

Which of the following can be bleached using Bleaching power?

Cotton

Wool

Silk

All of these

60 / 100

Category: Chemistry Ch 10 Class 12

Markownikoff’s rule is best applicable to the reaction between

NUMS 2018
Chemistry
Alkyl Halides and Amines
Elimination Tool:

A) C3H6+ Br2

B) C2H4+ HCl

C) C3H8+ Br2

D) C3H6+ HBr

61 / 100

Category: Chemistry Ch 3 Class 12

Impurities of lead in silver are removed by:

NUMS 2016
Chemistry
d and f Block Elements
Elimination Tool:

A) Parke’s process

B) Solvay process

C) Cyanide process

D) Amalgamation process

62 / 100

Category: Chemistry Ch 1 Class 12

In which of the following chromium has different oxidation state?

NTS 2016 SMBBMC
Chemistry
Periodicity in Elements
Elimination Tool:

A) K2Cr2O7

B) CrCl3

C) CrO3

D) K2CrO4

63 / 100

Category: Chemistry Ch 7 Class 12

Which of the following is the correct IUPAC name?

NTS 2016 SMBBMC
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) 3 – Ethyl – 4, 4-dimethylheptane

B) 4,4 – Dimethyl – 3 – ethylheptane

C) 5 – Ethyl – 4, 4 – dimethylheptane

D) 2, 3 – diethylheptane

64 / 100

Category: Chemistry Ch 7 Class 11

Which of following is NOT state variable of thermodynamics?

Entropy

Internal energy

Volume

Density

65 / 100

Category: Chemistry Ch 7 Class 11

A catalyst increases the rate of reaction by:

NTS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) decreasing the activation energy

B) decreasing the concentration of reactants

C) decreasing the temperature

D) increasing the temperature

66 / 100

Category: Chemistry Ch 1 Class 12

The formula of washing soda is:

NUMS 2015
Chemistry
Periodicity in Elements
Elimination Tool:

A) N2CO3

B) Na2CO3 . H2O

C) Na2CO3 . 7H2O

D) Na2CO3 . 10 H2O

67 / 100

Category: Chemistry Ch 12 Class 12

Simplest aromatic aldehyde has number of hydrogen atoms.

68 / 100

Category: Chemistry Ch 4 Class 11

Which one Is not possible a)

Ionic crystal

Covalent crystal

Metallic crystal

Atomic-crystal

69 / 100

Category: Chemistry Ch 12 Class 12

The general formula for an aldehyde is:

NTS 2010
Chemistry
Aldehydes and Ketones
Elimination Tool:

B) R-COOH

C) R-CO-R

D) R-X

E) R-CHO

70 / 100

Category: Chemistry Ch 4 Class 11

Ice floats on the surface of water due to:

NUMS 2020
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Larger bond length

B) Cubic structure of ice

C) Weak intermolecular forces

D) Empty spaces in the structure of ice

71 / 100

Category: Chemistry Ch 4 Class 12

In which of the following the oxidation state of S is the highest

SO2

SCl2

H2SO4

H2S03

72 / 100

Category: Chemistry Ch 9 Class 11

The aqueous solution of which of the following electrolyte will conduct electric current to large extent:

ETEA 2018
Chemistry
Solution and Colloids
Elimination Tool:

A) ??(??)2

B) ?2??3

C) N?4??

D) N?4?H

73 / 100

Category: Chemistry Ch 3 Class 11

Diamond and Graphite:

NTS 2013
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) are isotopes

B) are isomers

C) are allotropes

D) have the same structure

74 / 100

Category: Chemistry Ch 11 Class 11

The rate of reaction:

NUMS 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) Increases as the reaction proceeds

B) Decreases as the reaction proceeds

C) Remains the same as the reaction proceeds

D) May decrease or increase as the reaction proceeds

75 / 100

Category: Chemistry Ch 12 Class 12

Why is water added after the reduction process of aldehyde and ketone with LiAlH4?

NUMS 2019 Cancelled
Chemistry
Aldehydes and Ketones
Elimination Tool:

A) Because water reacts violently with LiAlH4

B) Because water will protonate LiAlH4

C) Because water inhibits the process

D) Because it will result to alkenes

76 / 100

Category: Chemistry Ch 5 Class 11

In a discharge tube, at room pressure there is

Maximum discharg

Minimum discharge

No discharge

Moderate dischil

77 / 100

Category: Chemistry Ch 11 Class 12

The alcohols in which the carbon which is attach to the OH group is further attach with two carbon atoms is called as?

PMC Sample 2
Chemistry
Alcohols, Phenols and Ethers
Elimination Tool:

A) Primary alcohols

B) Secondary alcohols

C) Tertiary alcohols

D) None of these

78 / 100

Category: Chemistry Ch 6 Class 12

Transition elements are colored in which type of compounds?

Ionic

Covalent

Both a and b

None of these

79 / 100

Category: Chemistry

Q.163 Which will need maximum energy to remove its one electron?

A. Na————– Na- +e

B. Ca——————-Ca– +e

C.K————K++ +e

D. C2+————– C3+ +e

80 / 100

Category: Chemistry Ch 2 Class 11

Slow cooling yields crystals of length?

Medium size

Small

Bigger

None of these

81 / 100

Category: Chemistry Ch 1 Class 11

) Which one of the following has no isotope

Hydrogen

Helium

Nitrogen

None

82 / 100

Category: Chemistry Ch 4 Class 11

The formula of Chile Saltpeter is?

PMC Practice 5
Chemistry
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) NaNO3

B) CaCO3

C) Ba(NO3)2

D) NH4Cl

83 / 100

Category: Chemistry

Q.76 Which of the following methods .used to prepare acetic acid?

A. Distillation

B. Fermentation

C. Dehydration

D. Ozon lysis

84 / 100

Category: Chemistry Ch 7 Class 12

Isomerism due to shifting of proton from one atom to another in a same molecule is known as:

NUMS 2020
Chemistry
Fundamental Principles of Organic Chemistry
Elimination Tool:

A) Metamerism

B) Tautomerism

C) Position

D) Functional

85 / 100

Category: Chemistry Ch 10 Class 12

NH3 (amine) is an example of:

NTS 2015 DUHS and JSMU
Chemistry
Alkyl Halides and Amines
Elimination Tool:

A) Negative ligand

B) Anionic ligand

C) Neutral ligand

D) Organic ligand

86 / 100

Category: Chemistry Ch 11 Class 12

Which is more soluble in ethanol?

chlorine

Calcium carbonate

Potassium chloride

Propane

87 / 100

Category: Chemistry Ch 11 Class 11

Half life period of the first order reaction depends upon:

NUMS 2015
Chemistry
Reaction Kinetics
Elimination Tool:

A) Initial concentration

B) Temperature

C) Catalyst

D) All of above

88 / 100

Category: Chemistry Ch 4 Class 12

The chemical name of K2[Zn(OH)4] is:

NTS 2019
Chemistry
d and f Block Elements
Elimination Tool:

A) Potassium tetrahydroxyzinc (II)

B) Potassium tetrahydroxozincate (II)

C) Potassium tetrahydroxyzincate (VI)

D) Potassium hydroxyzinc (II)

89 / 100

Category: Chemistry Ch 10 Class 11

Oxidation state of P in Mg2P3O5 Is

-2

-1

90 / 100

Category: Chemistry Ch 8 Class 12

Catenation is a process in which carbon shows the properties of:

NTS 2010
Chemistry
Hydrocarbons
Elimination Tool:

A) Making single bond

B) Hybridization

C) Making chains or rings of carbon atoms

D) Isomerism

91 / 100

Category: Chemistry Ch 10 Class 12

(NI13) is a:

Nucleophile

Neutrophile

Electrophile

Electrolyte

92 / 100

Category: Chemistry Ch 1 Class 12

Triads were introduced by

Newland

Dobreiner

Mendeleev

Al-Razi

93 / 100

Category: Chemistry

Which one of the following alkaline earth metal carbonates is thermally the most stable?

NUMS Mock 3
Chemistry
s and p Block Elements

A) BaCO3

B) MgCO3

C) CaCO3

D) SrCO3

94 / 100

Category: Chemistry

The spectrum of He is expected to be similar to that of:

NUMS Mock 4
Chemistry
Atomic Structure

A) Hydrogen

B) Sodium

C) Oxygen

D) Li+

95 / 100

Category: Chemistry Ch 11 Class 11

A catalyst:

NTS 2016 DUHS & JSMU
Chemistry
Reaction Kinetics
Elimination Tool:

A) Increases the rate of forward reaction

B) Increases the rate of both forward and reverse reaction

C) Changes equilibrium position

D) Increases the rate of reverse reaction

96 / 100

Category: Chemistry Ch 4 Class 11

Which one of the following is an example of covalent solid?

NaCI

Diamond

Mercury

All of these

97 / 100

Category: Chemistry Ch 5 Class 12

The order of decreasing power as an oxidizing agent is

F2> Br2> Cl2>I2

F2 > O2> Br2 > I2

F2 < O2 < Br2 < I2

F2 < Br2< C12 <I2

98 / 100

Category: Chemistry Ch 13 Class 12

Carboxylic acids are formed by the hydrolysis of ________.

PMC Practice 3
Chemistry
Carboxylic Acids and its Derivatives
Elimination Tool:

A) Ester & Nitriles

B) Nitriles & Amines

C) Alkenes & Alkynes

D) Esters & Alcohols

99 / 100

Category: Chemistry Ch 8 Class 12

The IUPAC name of the compound having structural formula CH3 — CH(OH) —COON is:

2-hydroxy propanoic acid

Lactic acid

a-hydroxy propanoic acid

Both a and b

100 / 100

Category: Chemistry

Q.99 The ionic compound with the highest lattice energy is

A. NaF

B. NaCl

C. NaBr

D. NaI

Your score is

The average score is 57%

Structured Practice for Best Entry Test Preparation

This topic-wise and chapter-wise practice test allows students to focus on individual chemistry concepts, numerical problems, reactions, and practical exercises. Regular practice enhances understanding, sharpens problem-solving abilities, and builds confidence to tackle both board and competitive exam questions efficiently.

Free Resources for Best Entry Test Preparation

Students can access free Chemistry Practice Test 4 to systematically improve knowledge, calculation skills, and problem-solving abilities. This test is suitable for FSC Board Exams as well as major entry tests, helping students perform better in the chemistry section. PLS Academy provides these resources to support students in their preparation.

JazakAllah