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Important Chemistry Formulas For NEET 2024 Exam- Topic-wise Formulas

Important Chemistry Formulas For NEET 2024 Exam- Topic-wise Formulas

Edited By Irshad Anwar | Updated on May 05, 2024 01:13 PM IST | #NEET

Ready to enter one of India's top medical colleges by passing the National Eligibility and Entrance Test (NEET)? Understanding chemistry concepts such as stoichiometry, thermodynamics, and kinetics requires a solid grasp of equations and reactions and NEET chemistry formulas, which are important components of the NEET exam. NEET aspirants should know that studying important chemistry formulas for NEET and equations during the last-minute revision before an exam matters greatly. In the extremely competitive NEET exam, every mark counts. If students have a solid understanding of the NEET chemistry formula sheet pdf, they can easily secure marks on formula-based questions, which are often simple.

Finally, mastering these equations and reactions and NEET chemistry formulas enhances confidence, accuracy, efficiency, and problem-solving skills. These are necessary qualities for passing the NEET exam. We have compiled a chemistry formula sheet for NEET PDF from the top 11 most-scoring concepts in physics on the NEET syllabus. This formula sheet for chemistry NEET will guide those preparing for the NEET exam in their last-minute preparation.

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Chemistry Formula Sheet for NEET PDF

  1. Shapes Of Molecules

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The ideal shapes of molecules, which are predicted based on electron pairs and lone pairs of electrons, are mentioned in the table below:

A table is shown that is comprised of six rows and six columns. The header row reads: “Number of Electron Pairs,” “Electron pair geometries; 0 lone pair,” “1 lone pair,” “2 lone pairs,” “3 lone pairs,” and “4 lone pairs.” The first column contains the numbers 2, 3, 4, 5, and 6. The first space in the second column contains a structure in which the letter E is single bonded to the letter X on each side. The angle of the bonds is labeled with a curved, double headed arrow and the value, “180 degrees.” The structure is labeled, “Linear.” The second space in the second column contains a structure in which the letter E is single bonded to the letter X on three sides. The angle between the bonds is labeled with a curved, double headed arrow and the value, “120 degrees.” The structure is labeled, “Trigonal planar.” The third space in the second column contains a structure in which the letter E is single bonded to the letter X four times. The angle between the bonds is labeled with a curved, double headed arrow and the value, “109 degrees.” The structure is labeled, “Tetrahedral.” The fourth space in the second column contains a structure in which the letter E is single bonded to the letter X on five sides. The angle between the bonds is labeled with a curved, double headed arrow and the values “90 and 120 degrees.” The structure is labeled, “Trigonal bipyramid.” The fifth space in the second column contains a structure in which the letter E is single bonded to the letter X on six sides. The angle between the bonds is labeled with a curved, double headed arrow and the value, “90 degrees.” The structure is labeled, “Octahedral.” The first space in the third column is empty while the second contains a structure in which the letter E is single bonded to the letter X on each side and has a lone pair of electrons. The angle between the bonds is labeled with a curved, double headed arrow and the value, “less than 120 degrees.” The structure is labeled, “Bent or angular.” The third space in the third column contains a structure in which the letter E is single bonded to the letter X three times and to a lone pair of electrons. It is labeled with a curved, double headed arrow and the value, “less than 109 degrees.” The structure is labeled, “Trigonal pyramid.” The fourth space in the third column contains a structure in which the letter E is single bonded to the letter X on four sides and has a lone pair of electrons. The bond angle is labeled with a curved, double headed arrow and the values, “less than 90 and less than 120 degrees.” The structure is labeled, “Sawhorse or seesaw.” The fifth space in the third column contains a structure in which the letter E is single bonded to the letter X on five sides and has a lone pair of electrons. The bond angle is labeled with a curved, double headed arrow and the value, “less than 90 degrees.” The structure is labeled, “Square pyramidal.” The first and second spaces in the fourth column are empty while the third contains a structure in which the letter E is single bonded to the letter X on each side and has two lone pairs of electrons. The bond angle is labeled with a curved, double headed arrow and the value, “less than less than 109 degrees.” The structure is labeled, “Bent or angular.” The fourth space in the fourth column contains a structure in which the letter E is single bonded to the letter X three times and to two lone pairs of electrons. The bond angle is labeled with a curved, double headed arrow and the value, “less than 90 degrees.” The structure is labeled, “T - shape.” The fifth space in the fourth column contains a structure in which the letter E is single bonded to the letter X on four sides and has two lone pairs of electrons. The bond angle is labeled with a curved, double headed arrow and the value “90 degrees.” The structure is labeled, “Square planar.” The first, second and third spaces in the fifth column are empty while the fourth contains a structure in which the letter E is single bonded to the letter X on each side and has three lone pairs of electrons. The bond angle is labeled with a curved, double headed arrow and the value, “180 degrees.” The structure is labeled, “Linear.” The fifth space in the fifth column contains a structure in which the letter E is single bonded to the letter X three times and to three lone pairs of electrons. The bond angle is labeled with a curved, double headed arrow and the value, “less than 90 degrees.” The structure is labeled, “T - shape.” The first, second, third, and fourth spaces in the sixth column are empty while the fifth contains a structure in which the letter E is single bonded to the letter X on each side and has four lone pairs of electrons. The bond angle is labeled with a curved, double headed arrow and the value “180 degrees.” The structure is labeled, “Linear.” All the structures use wedges and dashes to give them three dimensional appearances.

  1. Solubility And Solubility Products

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General Representation
\mathrm{A_xB_y} \rightleftharpoons \mathrm{xA}^{+y}+\mathrm{yB}^{-\mathrm{x}}

\mathrm{Ksp =[ A^{+y}]^x \times[ B^{-x}]^y}

Relation between Solubility(s) and Solubility Product (Ksp)
\mathrm{A_xB_y} \rightleftharpoons \mathrm{xA}^{+y}+\mathrm{yB}^{-\mathrm{x}} s 0 0 - xs ys
\text { Thus, } \mathrm{Ksp = x ^{x} y ^{y}( s )^{ x + y }}

The Gas Laws- Boyle’s Law (Pressure-Volume Relationship) -

  1. The Gas Laws- Boyle’s Law (Pressure - Volume Relationship)

    1714400387682

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k1 is the proportionality constant whose value depends upon the following factors.

1714400387851 1714400387927


Relation between Density and Pressure

1714400388217

  1. Mathematical Analysis of Cubic System

Coordination Number (C. No.)

In Simple Cubic (SC): 6

In Face Centered Cubic (FCC): 12

In Body Centered Cubic (BCC): 8

Density of Lattice Matter (d)

It is the ratio of mass per unit cell to the total volume of a unit cell and it is found out as follows.

\mathrm{d}=\frac{\mathrm{Z} \times \text { Atomic weight }}{\mathrm{N}_{0} \times \text { Volume of unit cell }\left(\mathrm{a}^{3}\right)}


Here, d = Density

Z = Number of atoms

N0 = Avogadro number

a3 = Volume

a = Edge length

To find the density of a unit cell in cm3, m must be taken in g/mole and should be in cm.

Radius Ratio

It is the ratio of the radius of an octahedral void to the radius of the sphere forming the close-packed arrangement Normally, ionic solids are more compact, as voids are also occupied by cation (smaller in size). The pattern of arrangements and type of voids both depend on the relative size (ionic size) of two ions in a solid.

For example, when r+ = r- the most probable and favourable arrangement is BCC type.

With the help of relative ionic radii, it is easier to predict the most probable arrangement. This property is expressed as radio ratio.

\mathrm{\text { Radius ratio }=\frac{r^{+} \text {(radius of cation) }}{r^{-} \text { (Radius of anion) }}}


From the value of the radius ratio, it is clear that the larger the radius ratio, the larger the size of the cation, and the more anions needed to surround it—that is, the more coordination numbers.

Radius ratio for tetrahedron

\begin{array}{l}{\text { Angle } A B C \text { is the tetrahedral angle of } 109.5^{\circ}} \\\\ {\angle A B D=\frac{109.5}{2}=5475^{\circ}} \\\\ {\text { In triangle } A B D} \\\\ {\text { Sin } A B D=0.8164=A D / A B} \\\\ {\text { or } \frac{r^{*}+r}{r}=\frac{1}{0.8164}=1.225} \\\\ {\text { or } \frac{r^{*}}{\Gamma}=0.225}\end{array}

1714400387372

Radius ratio for octahedron

\begin{array}{l}{\mathrm{AB}=\mathrm{r}^{+}+\mathrm{r}} \\\\ {\mathrm{BD}=\mathrm{r}} \\\\ {\angle \mathrm{ABC}=45^{\circ}} \\\\ {\text { In triangle } \mathrm{ABD}}\end{array}\\\\\\\begin{array}{l}{\operatorname{Cos} A B D=0.7071=B D / A B} \\\\ {=\frac{r}{r^{+}+r}} \\\\ {\text { or } \frac{r^{+}+r}{r}=\frac{1}{0.707}=1.414} \\\\ {\text { or } \frac{r}{r^{4}}=0.414}\end{array}


1714400388353

  1. Charge On Colloids

Colloidal particles always carry an electric charge. The nature of this charge is the same for all the particles in a given colloidal solution and may be either positive or negative.

  1. Oxidation State

An interesting feature in the variability of oxidation states of the d-block elements is noticed among the groups. Although in the p–block the lower oxidation states are favoured by the heavier members (due to the inert pair effect), the opposite is true in the groups of d-block.

  1. Preparation Of Aldehyde

Rosenmund Reduction

1714400387289

Stephen Reduction
1714400387587

  1. Nucleophilic Addition Reaction:

(i) Mechanism of nucleophilic addition reactions:
1714400386979

1714400387462

  1. Reduction And Oxidation Reaction

Reduction to hydrocarbons:
The carbonyl group of aldehydes and ketones is reduced to the CH2 group on treatment with zinc amalgam and concentrated hydrochloric acid (Clemmensen reduction) hydrazine hydrazone or with hydrazine, followed by heating with sodium or potassium hydroxide in a high boiling solvent such as ethylene glycol (Wolff-Kishner reduction).

Oxidation
Aldehydes differ from ketones in their oxidation reactions. Aldehydes are easily oxidised to carboxylic acids on treatment with common oxidising agents like nitric acid, potassium permanganate, potassium dichromate, etc. Even mild oxidising agents, mainly Tollens’ reagent and Fehlings’ reagent, also oxidise aldehydes.

  1. Chemical Properties Of Carboxylic Acid:

Formation of Anhydride

1714400388411

Reaction with Ammonia
1714400388275

Reduction

1714400388475

Decarboxylation
1714400388616

Kolbe's electrolysis
1714400389110 Halogenation 1714400388672

Ring substitution
1714400389018

1714400388545

  1. Carbohydrates

Carbohydrates -

These are polyhydroxy aldehydes, ketones or substances that form these on hydrolysis and possess at least one chiral atom. The (-OH) group is available in the form of hemiacetals or hemiketals.

Classification:
Carbohydrates can be classified into three categories:

  1. Monosaccharides: They are the simplest carbohydrates which cannot be hydrolysed into smaller molecules. They are sweet and crystalline and are called sugars.

  2. Oligosaccharides: These carbohydrates, on hydrolysis, give two to nine molecules of monosaccharides classified as di-, tri, tetra-saccharides, etc. For example, sucrose, maltose, lactose, raffinose, etc. They are also called sugars.

  3. Polysaccharides: These carbohydrates, on hydrolysis, give a large number of monosaccharides, e.g., starch, cellulose, etc. They are also called non-sugars.

Reducing and Non-reducing Sugars
Those sugars which reduce Fehling's and Tollens's solutions are called reducing sugars and those which do not reduce these reagents are called non-reducing sugars.

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Questions related to NEET

Have a question related to NEET ?

Hello,

The eligibility criteria for low vision is that a minimum of 40% disability is required to avail of the PWD quota. Since you have 20% low vision, you may not meet the minimum required threshold for the PWD quota under NEET guidelines


Hope this helps,


Thank you

Hello aspirant

If you belong to obc category then you have high chances of getting government college with 380 marks but through All India Quota , which course you will be offered to you , can't be predicted now . It will depend upon neet cur iff which ultimately depends upon , students appeared,  difficulty level of exam,  normalisation process,  availability of seat,  previous year's cut off etc.  See for AIQ only 15% seats are offered so it will be difficult to get mbbs, bds

Qualifying percentile For obc category is 40 percentile.


For rank and college prediction you may visit the links given below

https://medicine.careers360.com/neet-rank-predictor

https://medicine.careers360.com/neet-college-predictor

Hello aspirant,

The cutoff of colleges changes every year as it depends on the number of applicants, exam difficulty level etc. But at 438 score, you have good chances of getting BDS seat in good colleges. I suggest you to try to get admission in this year only.

Thank you

Hope this information helps you.

Hello Akshat

You havd taken taken 2 years drop .Neet exam was. Commenced in this month only . Again you can appear next year if you want to prepare.

You have not mentioned your exact marks .

It is not possible to just predict medical Course and college .

Even you won't get bds seat with 200+ marks . These days die to fierce competition  , you need 400 marks for bds Course.

With your exact score we can just assume .

Wait for this year's neet results ,

Admissions are based on Neet cut off. Cut iff changes every year , also it depends upon Number of students appeared,  Toughness level of exam. Previous year's cut off etc .


For college prediction you may visit the link given below

https://medicine.careers360.com/neet-college-predictor

Hello aspirant

We can't predict neet cut off of any specific college at this time  as cut off keeps changing every year. Cut off depends upon Number of candidates appeared in exam, difficulty level of exam,  , seat intake and previous year's cut off .

Cut off varies with category too  just as , for general category candidate neet qualifying  marks are 50 percentile

For sc/st/ obc category candidate qualifying marks are 40 percentile whereas for ews/pwd it is 45 percentile.

Cut off varies with medical Course too for example cut off neet  ( kpc , jadavpu r ) for MD in general medicine 2021 was rank 25955 whereas 2022 MD in general medicine was rank 16986 so let's wait for results


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Column I ( Salivary gland)

 

Column II ( Their location)

Parotids

I

Below tongue

Sub-maxillary / sub-mandibular

Ii

Lower jaw

Sub-linguals

Iii

Cheek

Option: 1

a(i), b(ii) , c(iii)

 


Option: 2

a(ii), b(i), c(iii)

 


Option: 3

a(i), b(iii), c(ii)


Option: 4

a(iii), b(ii), c(i)


Ethyl \; ester \xrightarrow[(excess)]{CH_{3}MgBr} P

the product 'P' will be ,

Option: 1


Option: 2


Option: 3

\left ( C_{2}H_{5} \right )_{3} - C- OH


Option: 4


 

    

           

 Valve name                            

             

Function

    I   Aortic valve     A

Prevents blood from going backward from the pulmonary artery to the right ventricle.

    II   Mitral valve     B

 Prevent blood from flowing backward from the right ventricle to the right atrium.

    III   Pulmonic valve     C

 Prevents backward flow from the aorta into the left ventricle.

    IV   Tricuspid valve     D

 Prevent backward flow from the left ventricle to the left atrium.

 

Option: 1

I – A , II – B, III – C, IV – D


Option: 2

 I – B , II – C , III – A , IV – D


Option: 3

 I – C , II – D , III – A , IV – B


Option: 4

 I – D , II – A , III – B , IV – C 

 

 


Column A Column B
A

a) Organisation of cellular contents and further cell growth.  

B

b) Leads to formation of two daughter cells.

C

c) Cell grows physically and increase volume proteins,organells.

D

d)  synthesis and replication of DNA.

Match the correct option as per the process shown in the diagram. 

 

 

 

Option: 1

1-b,2-a,3-d,4-c
 


Option: 2

1-c,2-b,3-a,4-d


Option: 3

1-a,2-d,3-c,4-b

 


Option: 4

1-c,2-d,3-a,4-b


0.014 Kg of N2 gas at 27 0C is kept in a closed vessel. How much heat is required to double the rms speed of the N2 molecules?

Option: 1

3000 cal


Option: 2

2250 cal


Option: 3

2500 cal


Option: 4

3500 cal


0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The modecular weight of the acid will be

Option: 1

32


Option: 2

64


Option: 3

128


Option: 4

256


0.5 F of electricity is passed through 500 mL of copper sulphate solution. The amount of copper (in g) which can be deposited will be:

Option: 1

31.75


Option: 2

15.8


Option: 3

47.4


Option: 4

63.5


0.5 g of an organic substance was kjeldahlised and the ammonia released was neutralised by 100 ml 0.1 M HCl. Percentage of nitrogen in the compound is

Option: 1

14


Option: 2

42


Option: 3

28


Option: 4

72


0xone is

Option: 1

\mathrm{KO}_{2}


Option: 2

\mathrm{Na}_{2} \mathrm{O}_{2}


Option: 3

\mathrm{Li}_{2} \mathrm{O}


Option: 4

\mathrm{CaO}


(1) A substance  known as "Smack"

(2) Diacetylmorphine

(3) Possessing a white color

(4) Devoid of any odor

(5) Crystal compound with a bitter taste

(6) Obtained by extracting from the latex of the poppy plant

The above statements/information are correct for:

Option: 1

Morphine


Option: 2

Heroin


Option: 3

Cocaine


Option: 4

Barbiturates


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