Download App

Solutions — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySolutions2 Marks
Question
State Raoult’s law for solutions of volatile liquid components. Taking a suitable example, explain the meaning of positive deviation from Raoult’s law.
✓

Answer

Raoult’s law states that for a solution of volatile liquids, the partial vapour pressure of each component in the solution is directly proprtional to its mole fraction.
When the solute-solvent interaction is weaker than those between the solute-solute and solvent-solvent molecules then solution shows positive deviation from Raoults law hence the partial pressure of each component is greater. ex. mixture of ethanol and acetone or carbondisulphide and acetone behave in this manner.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Solutions→Solutions — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Give the structure of A, B and C in the following reaction:$\text{CH}_3\text{CH}_2\text{I}\xrightarrow[]{\text{NaCN}}\text{A}\xrightarrow[\text{Partial hydolysis}]{\text{OH}^+}\text{B}\xrightarrow[]{\text{NaOH}+\text{Br}_2}\text{C}$
→
Half-life Period of first order reaction is 10 min. Calculate the rate constant of the reaction.
→
A first order reaction takes 40 min for 30% decomposition calculate $t_{1/2}$.
→
What is conductance and conductivity $($specific conductance$)$?
→
Write common name and $\text{IUPAC}$ name of following alcohol compound. $\ce{CH3-CH2-CH2-OH}$
→
(a) Write the structural formula of isobutyl alcohol.
(b) Draw the resonance structure of phenol.
→
Discuss the classification of monohydric alcohols containing $C_{sp}^2-OH$ bond.
→
Calculate the mass of ascorbic acid $($Vitamin $C, C_6H_8O_6)$ to be dissolved in $75 g$ of acetic acid to lower its melting point by $1.5^\circ C. Kf = 3.9 K \ kg \ mol^{-1}.$
→
The reaction of alkyl chloride with aquons KOH produces an alcohol, while the reaction with alcoholic КОН produces an alkene. Explain why and write the chemical equations for both reactions
→
Calculate the mole fraction of gas $A$ is the soltuion made an mixing 0.5 moles of gas $A$ and 4.5 moles of gas B.
→