By going through these Maharashtra State Board 12th Science Chemistry Notes Chapter 2 Solutions students can recall all the concepts quickly.

## Maharashtra State Board 12th Chemistry Notes Chapter 2 Solutions

→ Henry’s law : S = K_{H}P

→ Raoult’s law : P_{soln} = x_{1}P_{0}

→ Mole fractions, x_{1} + x_{2} = 1

→ P_{soln} = P°_{1}x_{1} + P°_{2}x_{2}

→ P_{soln} = (P°_{2} – P°_{1})x_{2} + P°_{1}

→ Mole fractions of components in vapour phase : y_{1} = \(\frac{x_{1} P_{1}^{0}}{P}\) and y_{2} = \(\frac{x_{2} P_{2}^{0}}{P}\)

→ For ideal solutions : ΔV_{mix} = 0; Δ_{mix}H = 0

→ Relative lowering of vapour pressure = \(\frac{P^{0}-P}{P^{0}}\), x_{2} = \(\frac{P^{0}-P}{P^{0}}\)

→ \(\frac{P^{0}-P}{P^{0}}=\frac{W_{2} \times M_{1}}{W_{1} \times M_{2}}\)

→ Δ T_{b} = K_{b} x m and Δ T_{f} — K_{f} x m

→ ΔT_{b} = K_{b} x \(\frac{W_{2} \times 1000}{W_{1} \times M_{2}}\)

→ ΔT_{f} = K_{f} x \(\frac{W_{2} \times 1000}{W_{1} \times M_{2}}\)

→ π = cRT and π = \(\frac{W R T}{M \times V}\)

→ i = \(\frac{Colligative property of electrolyte solution}{Colligative property of nonelectrolyte solution of the same concentration}\)

→ Van’t Hoff factor (i) = \(\frac{\Delta T_{\mathrm{b}(\mathrm{ob})}}{\Delta T_{\mathrm{b}(\mathrm{th})}}=\frac{\Delta P_{(\mathrm{ob})}}{\Delta P_{(\mathrm{th})}}=\frac{\Delta T_{\mathrm{f}(\mathrm{ob})}}{\Delta T_{\mathrm{f}(\mathrm{th})}}=\frac{\pi_{\mathrm{ob}}}{\pi_{\mathrm{th}}}=\frac{M_{\mathrm{th}}}{M_{\mathrm{ob}}}\)

→ Colligative properties considering van’t Hoff factor :

→ α = \(\frac{i-1}{n-1}\) (for dissociation)