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Important Physical Chemistry Formulas for JEE and NEET

Atomic Structure

Estimation of closest distance of approach (derivation) of α-particle : Important Physical Chemistry Formulas for JEE and NEET

The radius of a nucleus : R = R0 (A)1/3 cm

Planck's Quantum Theory : Energy of one photon = hv = (hc/λ)

Photoelectric Effect: Important Physical Chemistry Formulas for JEE and NEET

Bohr’s Model for Hydrogen like atoms :

  1. mvr = n(h/2π) (Quantization of angular momentum) 
  2. Important Physical Chemistry Formulas for JEE and NEET
  3. Important Physical Chemistry Formulas for JEE and NEET
  4. Important Physical Chemistry Formulas for JEE and NEET

De-Broglie wavelength :

Important Physical Chemistry Formulas for JEE and NEET

Wavelength of emitted photon :

Important Physical Chemistry Formulas for JEE and NEET

No. of photons emitted by a sample of H atom :

Important Physical Chemistry Formulas for JEE and NEET

Heisenberg’s uncertainty principle:

Important Physical Chemistry Formulas for JEE and NEET

Or

Important Physical Chemistry Formulas for JEE and NEET

Or

Important Physical Chemistry Formulas for JEE and NEET

Quantum Numbers:

  • Principal quantum number (n) = 1,2, 3, 4 .... to∞.
  • Orbital angular momentum of electron in any orbit = nh/2π.
  • Azimuthal quantum number (l) = 0 , 1 .... to (n - 1).
  • Number of orbitals in a subshell = 2l + 1
  • Maximum number of electrons in particular subshell = 2x (2l+ 1)
  • Orbital angular momentum L = Important Physical Chemistry Formulas for JEE and NEET Important Physical Chemistry Formulas for JEE and NEET


Stoichiometry

  • Relative atomic mass (R.A.M)= Important Physical Chemistry Formulas for JEE and NEET Total Number of nucleons
  • Y-map

Important Physical Chemistry Formulas for JEE and NEET

Density:

Important Physical Chemistry Formulas for JEE and NEET

For gases:

Absolute density (mass/volume) = Important Physical Chemistry Formulas for JEE and NEET

Vapour density Important Physical Chemistry Formulas for JEE and NEET

Mgas = 2 V.D.

Mole-mole analysis:

Important Physical Chemistry Formulas for JEE and NEET

Concentration terms:

Molarity (M):

Important Physical Chemistry Formulas for JEE and NEET

Molality (m):

Important Physical Chemistry Formulas for JEE and NEET

Mole fraction (x):

∴ Mole fraction of solution (x1) =Important Physical Chemistry Formulas for JEE and NEET ∴ Mole fraction of solvent (x2) = 

Important Physical Chemistry Formulas for JEE and NEET

% Calculation:

Important Physical Chemistry Formulas for JEE and NEET

Derive the following conversion:

  1. Mole fraction of solute into molarity of solution M =Important Physical Chemistry Formulas for JEE and NEET
  2. Molarity into mole fraction x2 = Important Physical Chemistry Formulas for JEE and NEET
  3. Mole fraction into molality m = Important Physical Chemistry Formulas for JEE and NEET
  4. Molality into mole fraction x2 = Important Physical Chemistry Formulas for JEE and NEET
  5. Molality into molarity M = Important Physical Chemistry Formulas for JEE and NEET
  6. Molarity into Molality m = Important Physical Chemistry Formulas for JEE and NEET

M1 and M2 are molar masses of solvent and solute, ρ is density of solution (gm/mL) 

M = Molarity (mole/lit.), m = Molality (mole/kg), x1 = Mole fraction of solvent, x2 = Mole fraction of solute

Average/Mean atomic mass:

Important Physical Chemistry Formulas for JEE and NEET

Mean molar mass or molecular mass:

Important Physical Chemistry Formulas for JEE and NEET

Calculation of individual oxidation number :

Oxidation Number = number of electrons in the valence shell - number of electrons left after bonding


Concept of Equivalent weight/Mass:

For elements, equivalent weight (E) = 

Important Physical Chemistry Formulas for JEE and NEET

Important Physical Chemistry Formulas for JEE and NEET

Equivalent weight (E) = Important Physical Chemistry Formulas for JEE and NEET (v.f. = valency factor)

Concept of number of equivalents:

No. of equivalents of solute = Important Physical Chemistry Formulas for JEE and NEET

No. of equivalents of solute = No. of moles of solute x v.f.

Normality (N): 

Important Physical Chemistry Formulas for JEE and NEET

Normality = Molarity x v.f.

Calculation of valency Factor:

n-factor of acid = basicity = no. of H+ ion(s) furnished per molecule of the acid, 

n-factor of base = acidity = no. of OH- ion(s) furnised by the base per molecule.

At equivalence point:

Important Physical Chemistry Formulas for JEE and NEET

Volume strength of H2O2:

20V H2O2 means one litre of this sample of H2O2 on decomposition gives 20 It. of O2 gas at S.T.P.

Important Physical Chemistry Formulas for JEE and NEET

Measurement of Hardness:

Important Physical Chemistry Formulas for JEE and NEET

Calculation of available chlorine from a sample of bleaching powder :

Important Physical Chemistry Formulas for JEE and NEET where x = molarity of hypo solution and v = mL. of hypo solution used in titration.

The document Important Physical Chemistry Formulas for JEE and NEET is a part of the NEET Course Chemistry Class 12.
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