Chemistry 1 Marks Question

The maximum amount of solvent that can dissolve in 100 gm of solvent at a certain temperature is called saturated solution.

Chloroform molecule cannot form hydrogen bonds with acetone molecule, hence the solution of chloroform and acetone shows negative deviation from Raoult's law:

 

Molarity (M) : The number of moles of solute dissolved in one litre (1) of solution is called molarity of the solution.

Solution of hydrogen in palladium.

On increasing the temperature of the solution, molarity decreases because the volume of solution increases.

As the temperature increases the solubility of gases in water decreases, therefore, the amount of oxygen in hot water is less, hence the aquatic animals remains more easily in cold water than in hot water.

Salt water is hypertonic, due to which it expels the factor causing strain in the throat.

Isopropyl alcohol is volatile, hence it absorbs latent heat from skin and gets converted in to vapour due to which cooling is felt.

Ethylene glycol works as an antifreeze.

The process of osmosis will take place in egg due to which it shrinks.

Equimolar solutions of sugar and KCl are not isosmotic because KCl dissociates to give two ions whereas sugar does not dissociates.

When more pressure is applied on the solution than the osmotic pressure, reverse osmosis occurs.

By adding glucose, the vapour pressure of water will reduce because glucose is a non-volatile substance.

By cooling the ammonia bottle its vapour pressure reduces due to which the liquid ammonia does not come out quickly.

On increasing the pressure the solubility of gases in liquids increases.

The components present in a mixture in fixed proportions which boils together at a fixed temperature, hence, they can't be separated by fractional distillation.

Very dilute solution, almost uniform compositon and polar liquids have the tendency to form ideal solutions.

The mole fraction of a gas in solution is proportional to the partial pressure of the gas present above, that is, the partial pressure of a gas in the vapour state is proportional to the mole fraction of the gas in the solution. This is called Henry's law.

On increasing the temperature, the solubility of gases in liquids decreases.

One molar solution.

Molality is given more importance than molarity because molality does not depend on temperature.

Boiling point of elevation and molality are proportional to each other.

The boiling point elevation will be more in solution Y because the molecular weight of urea is less than the molecular weight of sugar, hence the molality of solution Y will be more than the molality of solution X and the boiling point elevation is proportional to the molality.

On adding sugar to milk, the freezing point of milk becomes molar (freezing point depression), that is, the milk will freeze at a lower temperature than before, hence it takes more time to make ice-cream.

When onion is cooled, the vapour pressure of the volatile liquids present in it decreases which causes tears, hence their evaporation reduces. Hence, tears come less when cutting a cold onion.

Anoxia is a type of disease which is generally found in people living at high altitude. In this, the concentration of oxygen in the blood and tissues of people decreases, hence they become weak and their thinking ability also decreases.

Formation of solution of NaOH in water is an exothermic process, hence according to Le Chatelier's law, on increasing the temperature for exothermic process, the equilibrium goes in the reverse direction, that is the solubility of NaOH will decrease.

A carbonated soft drink bottle is filled with carbon di-oxide (CO₂) gas at high pressure. When the lid of the bottle is opened, this gas flows out rapidly from high pressure to low pressure, hence bubbles are seen coming out.