Chemistry NCERT Exemplar Solutions Class 12th Chapter Two
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4 months agoContributor-Level 10
This is a multiple choice answer as classified in NCERT Exemplar
(i) Mole fraction
Explanation: The mole fraction (x) is important for determining the relationship between a solution's concentration and its vapour pressure. Rault's law states that p1 = x1 po1 in a binary solution of two volatile liquids, where p1 is the vapour pressure of component 1, x1 is its mole fraction in solution, and po1 is the vapour pressure of pure solvent.
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
"A sheet of cellulose acetate laid over a suitable support" is the material used to make a semipermeable membrane for reverse osmosis.
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
Semi permeable membranes are continuous sheets or films (natural or synthetic) that have a network of submicroscopic holes or pores through which small solvent molecules like water may pass but larger molecules of solute cannot. Osmosis is the process of diffusion via this membrane.
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
'Depression in the freezing point of water when a nonvolatile solute is dissolved in it' is the phenomenon involved in removing snow-covered roads in hilly places. As a result, when salt is spread over snow-covered roads, snow melts from the surface due to a drop in the freezing point of water, which aids in road cleaning.
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
The fleeing tendencies of water molecules from the liquid level/surface create vapour pressure in any solvent or water. Only water molecules are present at the surface of pure water, but when a nonvolatile solute such as glucose is dissolved in it, a certain number of nonvolatile glucose molecules with no escape tendency are also present at the aqueous solution's surface.
As a result, the quantity of water molecules near the surface decreases, resulting in a lower number of water molecules being able to escape as vapours. When compared to pure water/solvent, this lowers
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
(a) (i) According to Henry's law, a gas's pressure is proportional to its solubility. The air pressure gradually falls as scuba divers approach the surface. This lower pressure causes the dissolved gases in the blood to be released, resulting in the development of nitrogen bubbles in the blood. This causes capillaries to constrict, resulting in bends, a painful and life-threatening medical condition.
(ii) The partial pressure of oxygen at high altitude is lower than at ground level. People living at high altitudes have reduced oxygen concentrations in their
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
It's worth noting that when the temperature drops, the values of Henry's law constant (KH) rise. Because of this, the solubility of oxygen in water increases with decreasing temperature at a given pressure. As a result, the presence of more oxygen at lower temperatures makes aquatic organisms feel more at ease in cold water than in warm water.
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
p =KHx (where p is the partial pressure of the gas in the vapour phase and x is the mole fraction of the gas in solution) is Henry's law expressed mathematically.
As a result of the aforementioned equation, "the lower the solubility of the gas in the liquid, the greater the value of Henry's law constant KH at a given pressure."
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
The number of moles of solute dissolved in one litre of solution is the molarity of a solution, which is defined as "the number of moles of solute dissolved in one litre of solution." Because volume is affected by temperature and changes with it, the molarity will also change as the temperature changes.
Other concentration words, such as mass percentage, ppm, mole fraction, and molality, are based on the mass-to-mass relationship of the solute and solvent in a binary solution. Because mass does not vary as a function of temperature, these concentration terms do not chan
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4 months agoContributor-Level 10
This is a short answer type question as classified in NCERT Exemplar
The solubility rule "like dissolves like" is based on the intermolecular forces of that exist in solution as follows:
If the intermolecular interactions in both components are similar, a substance (solute) dissolves in a solvent (ie. solvent and solute particles or molecules). When polar solutes dissolve in polar solvents and non-polar solutes dissolve in non-polar solvents, this is a regular occurrence.
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