Physical Pharmaceutics 1 MCQ Quiz With Answers

Solubility refers to the ability of a solute to dissolve in a solvent to form a homogeneous mixture. The solubility of a substance is influenced by various factors, including temperature, the nature of the solute, and the nature of the solvent. Temperature affects solubility because as temperature increases, the kinetic energy of the molecules increases, leading to more collisions and a higher likelihood of solute-solvent interactions. The nature of the solute and solvent also plays a role, as substances with similar polarities or molecular structures are more likely to dissolve in each other. Therefore, all three factors - temperature, solute, and solvent - collectively determine the solubility of a substance.

The correct answer is "all of them". Aqueous solution refers to a solution where the solvent is water. In this case, all the given options - salt solution, sugar solution, and mineral water - are examples of aqueous solutions. Salt and sugar can dissolve in water to form solutions, and mineral water is water that contains dissolved minerals. Therefore, all of them can be classified as aqueous solutions.

Solubility refers to the maximum amount of solute that can be dissolved in a given amount of solvent at a specific temperature. It is a characteristic property of a solvent and is often expressed in grams of solute per 100 grams of solvent. Solubility is affected by factors such as temperature and pressure. Therefore, solubility is the correct answer as it accurately describes the maximum amount of solute that can dissolve in 100g of a solvent at room temperature.

The correct answer is solubility. Solubility refers to the ability of a substance to dissolve in a solvent, in this case, water. The number of grams of a compound needed to saturate 100g of water is a measure of its solubility in water. Solubility is influenced by factors such as temperature, pressure, and the nature of the compound itself.

The solubility of gases increases with a decrease in temperature. This is because at lower temperatures, the kinetic energy of gas molecules decreases, causing them to move slower and come closer together. As a result, the gas molecules are more likely to interact with the solvent molecules and dissolve. Conversely, at higher temperatures, the kinetic energy of gas molecules increases, causing them to move faster and have less interaction with the solvent molecules, resulting in lower solubility.

A saturated solution is a solution that cannot hold any more solute at a given temperature and pressure. In other words, it is a solution in which the maximum amount of solute has been dissolved. If more solute is added to a saturated solution, it will not dissolve and will remain as solid particles at the bottom of the container.

Solutions can indeed be solids, liquids, or gases. A solution is a homogeneous mixture composed of a solute (the substance being dissolved) and a solvent (the substance doing the dissolving). The solute can be a solid, liquid, or gas that is evenly distributed within the solvent. For example, sugar (solid) can dissolve in water (liquid) to form a solution, while carbon dioxide (gas) can dissolve in water to form another type of solution. Therefore, the statement that solutions can be solids, liquids, or gases is accurate.

A concentrated solution is formed when a large amount of solute is dissolved in a given amount of solvent. In this type of solution, the ratio of solute to solvent is high, resulting in a high concentration of solute particles. This means that the solution has a high density of solute molecules or ions, making it highly concentrated.

In an unsaturated solution, the concentration of each ion of a sparingly soluble salt at 298K tells us the solubility product. The solubility product is a measure of the extent to which a salt can dissolve in a solvent. It is determined by the equilibrium between the dissolved ions and the undissolved salt. The concentration of each ion in the solution is directly related to the solubility product, as it indicates the amount of the salt that has dissolved. Therefore, by measuring the concentration of each ion, we can determine the solubility product of the salt.

The given information states that a saturated solution of lead (II) contains 0.99g per 100g of water. This means that the maximum amount of lead (II) that can dissolve in the water has already dissolved, resulting in a saturated solution. Therefore, the solution is not able to dissolve any more lead (II) and is considered insoluble.