Chemistry Quiz: Can You Pass This Chemical Reaction Test?

Explanation
The given explanation is correct. A true solution is a homogeneous mixture where the solute particles are evenly distributed throughout the solvent. In the case of chalk powder in water, the particles of chalk are not evenly distributed and can be seen as a separate phase, making it a heterogeneous mixture known as a suspension. Therefore, it is not a true solution.

Explanation
If carbon disulphide is the solvent in a given solution, then the solution is called a non-aqueous solution. Aqueous solutions are those that contain water as the solvent, while non-aqueous solutions are those that have solvents other than water. Since carbon disulphide is not water, it falls under the category of non-aqueous solutions.

Explanation
The solubility of common salt in 100g of water is 36g. This means that at that temperature and pressure, 100g of water can dissolve a maximum of 36g of salt. If 20g of salt is already dissolved in the water, then 16g more is required to reach the saturation point (36g - 20g = 16g).

Explanation
When two liquids are mutually soluble, it means that they can mix together in any proportion, forming a homogeneous solution. This property is known as miscibility. Therefore, the correct answer is "miscible."

Explanation
When sunlight passes through the window of the classrooms, its path is visible because of scattering of light. Scattering occurs when light interacts with particles or irregularities in the medium through which it is passing. In this case, the particles in the air inside the classroom cause the sunlight to scatter, making its path visible. Reflection, on the other hand, occurs when light bounces off a surface without changing its direction significantly, which is not the case here.

Explanation
Colloidal solution is the correct answer because it refers to a solution in which particles of one substance are dispersed evenly throughout another substance, forming a stable mixture. These particles are larger than those found in true solutions, making them visible under an ultramicroscope. In a colloidal solution, the particles do not settle out over time and can be observed due to the Tyndall effect, where light is scattered by the particles.

Explanation
In a binary solution, there are two substances present. A binary solution is a mixture that consists of two different substances, which can be a solid dissolved in a liquid, a gas dissolved in a liquid, or two liquids mixed together. Therefore, the correct answer is two.

Explanation
Deep sea divers use a mixture of gases that includes helium and oxygen. This is because at great depths, the pressure increases significantly, and breathing regular air can lead to nitrogen narcosis, a condition that impairs judgment and can be very dangerous. By using a mixture of helium and oxygen, divers can avoid nitrogen narcosis and safely explore deep underwater environments.

Explanation
The correct answer is saturation. Saturation refers to a state where a substance or material has reached its maximum capacity or limit. In the context of the question, it means that the earth soil has already absorbed and stored the maximum amount of nitrogen it can hold. This implies that the soil cannot store any more nitrogen and is already saturated with it.

Explanation
In an endothermic process, solubility increases with an increase in temperature. This is because endothermic processes absorb heat from the surroundings, and increasing the temperature provides more energy for the solute particles to break their bonds and dissolve in the solvent. As a result, the solute particles become more dispersed in the solvent, leading to an increase in solubility. Conversely, in an exothermic process, solubility decreases with an increase in temperature, as the excess heat released reduces the solute's ability to dissolve in the solvent.