Calculate the mass percentage of benzene C 6 H 6 and carbon tetrachloride CCl 4 if 22 g of benzene is dissolved in g of carbon tetrachloride. Ans: 0. Ans: Step I. Step II. Calculation of molarity of solution Step III. Calculation of mole fraction of Kl.
H 2 S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. Calculate the quantity of CO 2 in mL of soda water when packed under 2. Calculate the composition of the liquid mixture if total vapour pressure is mm of Hg.
Also find the composition in the vapour phase. Vapour pressure of pure water at K is Calculate the vapour pressure of water for this solution and its relative lowering. Boiling point of water at mm Hg is Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.
Define the terra solution. How many types of solutions are formed? Write briefly about each type with an example. Sol: A solution is a homogeneous mixture of two or more chemically non-reacting substances. Types of solutions: There are nine types of solutions.
Liquid solutions a Gas in liquid C02 dissolved in water aerated water , and 02 dissolved in water, etc. Solid solutions a Gas in solid Solution of hydrogen in palladium b Liquid in solid Amalgams, e. Suppose a solid solution is formed between two substances, one whose particles are very large and the other whose particles are very small.
What type of solid solution is this likely to be? Sol: The solution likely to be formed is interstitial solid solution. If A is the number of moles of solute dissolved in B moles of solvent, then Mole fraction of solute ii Molality: It is defined as die number of moles of a solute present in g 1kg of a solvent. NOTE: Molality is considered better way of expressing concentration of solutions, as compared to molarity because molality does not change with change in temperature since the mass of solvent does not vary with temperature, iii Molarity: It is defined as the number of moles of solute present in one litre of solution.
NOTE: Molarity is the most common way of expressing concentration of a solution in laboratory. However, it has one disadvantage. It changes with temperature because volume of a solution alters due to expansion and contraction of the liquid with temperature. If the density of solution is 1.
How many mL of 0. Sol: Calculation of no. An antifreeze solution is prepared from Calculate the molality of the solution. If the density of the solution is 1. A sample of drinking water was found to be severely contaminated with chloroform CHCl 3 , supposed to be a carcinogen.
The level of contamination was 15 ppm by mass. Sol: 15 ppm means 15 parts in million 10 6 by mass in the solution.
What role does the molecular interaction play in solution of alcohol in water? Sol: In case of alcohol as well as water, the molecules are interlinked by intermolecular hydrogen bonding. However, the hydrogen bonding is also present in the molecules of alcohol and water in the solution but it is comparatively less than both alcohol and water. This will lead to increase in vapour pressure of the solution and also decrease in its boiling point. Why do gases always tend to be less soluble in liquids as the temperature is raised?
Sol: When gases are dissolved in water, it is accompanied by a release of heat energy, i. If the bottle is opened by removing the stopper or seal, the pressure on the surface of the gas will suddenly decrease. This will cause a decrease in the solubility of the gas in the liquid i. As a result, it will rush out of the bottle producing a hissing noise or with a fiz.
In tissues, the partial pressure of oxygen is comparatively low. Therefore, oxyhaemoglobin releases oxygen in order to carry out cellular activities.
The partial pressure of ethane over a solution containing 6. If the solution contains 5. So there is expansion in volume on solution formation.
So weaker interactions are replaced by stronger interactions so , there is release of energy i. What is the molecular mass of the solute? At K, the vapour pressures of the two liquid components are What will be the vapour pressure of a mixture of The vapour pressure of water is Calculate vapour pressure of 1 molal solution of a non-volatile solute in it Sol: 1 molal solution of solute means 1 mole of solute in g of the solvent.
A solution containing 30g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2. Further, 18g of water is then added to the solution and the new of vapour pressure becomes 2. Calculate i molar mass of the solute. When dissolved in 20g of benzene C 6 H 6 , 1 g of AB 2 lowers the freezing point by 2. The molar depression constant for benzene is 5. Calculate atomic masses of A and B. Suggest the most important type of intermolecular attractive interaction in the following pairs: i n-hexane and n-octane ii I 2 and CCl 4.
Thus, the intermolecular interactions will be Ncert Solutions Class 10th Chemistry Chapter 4 Queue London dispersion forces. Water is a polar molecule. Thus, the intermolecular interactions will be ion-dipole interactions. Thus, intermolecular interactions will be dipole-dipole interactions.
Based on solute solvent interactions, arrange the following in order of increasing solubility in n-octane and explain. Sol: n-octane C 8 H 18 is a non-polar liquid and solubility is governed by the principle that like dissolve like. Amongst the following compounds, identify which are insoluble, partially soluble and highly soluble in water? Outside Delhi Sol:. If the solubility product of CuS is 6 x 10 , calculate the maximum molarity of CuS in aqueous solution.
Nalorphene C 19 H 21 NO 3 , similar to morphine, is used to combat withdrawal symptoms in narcotic users. Dose of nalorphene generally given is 1. Calculate the mass of 1. The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly. Solution: Fluorine being more electronegative than chlorine has the highest electron withdrawing inductive effect.
Thus, triflouroacetic acid is the strongest trichloroacetic acid is second most and acetic acid is the weakest acid due to absence of any electron withdrawing group. Greater the extent of ionization greater is the depression in freezing point. The depression in the freezing point of water observed is 1. Calculate the vapour pressure of water at K when 25 g of glucose is dissolved in g of water.
Calculate the solubility of methane in benzene at K under mm Hg. The vapour pressure of pure liquid B was found to be torr. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is torr. Vapour pressures of pure acetone and chloroform at K are The experimental data observed for different compositions of mixtures is: Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
Benzene and toluene form ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at K are Calculate the mole fraction of benzene in vapour phase if 80g of benzene is mixed with g of toluene. The air is a mixture of a number of gases. The water is in equilibrium with air at a pressure of 10 atm. Ans: 2. Calculation of mole fraction of Kl 2.
Sol: 2. Outside Delhi Sol: 2.
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