Important Chemistry Formulas For NEET 2025 Exam- Topic-wise Formulas PDF

Important Chemistry Formulas for NEET: Are you preparing for the NEET UG 2025 exam? Are you ready to enter one of India's top medical colleges by passing the National Eligibility and Entrance Test (NEET)? Master the NEET 2025 chemistry formula sheet to score high in the NEET exam. Here, we are providing the NEET chemistry formula sheet pdf 2025, topic-wise, that every NEET aspirant needs to know. From physical chemistry, and organic chemistry to inorganic chemistry, we've got all the chemistry imp formulas for NEET exam preparation 2025. Enhance your NEET preparation and boost your confidence with this chemistry formula sheet for NEET PDF 2024 Continue reading to discover the secrets to cracking NEET Chemistry in 2025.

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NTA conducts the NEET Exam once a year. 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 important formulas from the Chemistry NEET 2025 formula sheet 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 the chemistry NEET will guide those preparing for the NEET exam 2025 in their last-minute preparation.

Chemistry Formula Sheet for NEET PDF 2025

1. Shapes Of Molecules

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

2. Solubility And Solubility Products

General Representation

$
\begin{aligned}
& A_x B_y \rightleftharpoons x A^{+y}+y B^{-x} \\
& \mathrm{Ksp}=\left[A^{+y}\right]^x \times\left[B^{-x}\right]^y
\end{aligned}
$

Relation between Solubility(s) and Solubility Product (Ksp)

$
\mathrm{A}_{\mathrm{x}} \mathrm{~B}_{\mathrm{y}} \rightleftharpoons \mathrm{xA}^{+y}+\mathrm{yB}^{-\mathrm{x}} \mathrm{~s} 00-\mathrm{xs} \mathrm{ys}
$

Thus, Ksp $=x^x y^y(s)^{x+y}$

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

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

The Boyle's law may be expressed mathematically as
$\mathrm{P} \propto \frac{1}{\mathrm{~V}}$, (at constant T and n )
or $\mathrm{V} \propto \frac{1}{\mathrm{P}}, \quad($ at constant T and n )
Where,
$\mathrm{T}=$ temperature, $\mathrm{P}=$ pressure of the gas
$\mathrm{n}=$ number of moles of a gas and $\mathrm{V}=$ volume of the gas

$
\Rightarrow \mathrm{V}=\mathrm{k}_1 \frac{1}{\mathrm{P}}
$

k 1 is the proportionality constant whose value depends upon the following factors.

$
\begin{array}{r}
\mathrm{P}_1 \mathrm{~V}_1=\mathrm{P}_2 \mathrm{~V}_2=\text { constant } \\
\mathrm{PV}=\mathrm{k}_1 \text { or } \frac{P_1}{P_2}=\frac{V_2}{V_1}
\end{array}
$

Relation between Density and Pressure

According to Boyle's law at constant temperature and constant mass
$V \propto \frac{1}{P}$, As T and mass are constant
$V \propto \frac{1}{d}$, Here d is the density
As $\mathrm{V}=$ Mass/density
so $\quad \frac{1}{d} \propto \frac{1}{P}$
that is, $\mathrm{d} \propto P$ or $\mathrm{d}=\mathrm{K} / \mathrm{P}$
or $\log _{10} P=\log _{10} 1 / V+\log _{10} K$

$
d_1 / P_1=d_2 / P_2
$

4. 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.

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

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

Angle $A B C$ is the tetrahedral angle of $109.5^{\circ}$

$$
\angle A B D=\frac{109.5}{2}=5475^{\circ}
$$

In triangle $A B D$
$\operatorname{Sin} A B D=0.8164=A D / A B$
or $\frac{r^*+r}{r}=\frac{1}{0.8164}=1.225$
or $\frac{r^*}{r}=0.225$

Radius ratio for octahedron

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

5. 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.

6. 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.

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7. Preparation Of Aldehyde

Rosenmund Reduction

Stephen Reduction

8. Nucleophilic Addition Reaction:

(i) Mechanism of nucleophilic addition reactions:

9. 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.

10. Chemical Properties Of Carboxylic Acid:

Formation of Anhydride

Reaction with Ammonia

Reduction

Decarboxylation

Kolbe's electrolysis
Halogenation

Ring substitution

11. 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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