in a true solution, the dissolved particles
(1)are visible to the eye
(2)will settle out on standing
(3)are always solids
(4)cannot be removed by filtration
(4) cannot be removed by filtration
In a true solution, the dissolved particles are not visible to the eye, which rules out option (1). Additionally, these particles do not settle out on standing, so option (2) is also incorrect.
Now, let's focus on options (3) and (4). It is worth mentioning that a true solution can contain different types of dissolved particles, such as solids, liquids, or gases. So, option (3) is not always true since dissolved particles in a true solution are not always solids.
To determine the correct answer, we need to consider the physical properties of a true solution. A key characteristic is that the dissolved particles are molecularly dispersed and cannot be separated by filtration. Filtration is a process that separates solid particles from a liquid or a gas using a filter medium with tiny pores to trap the solid particles.
Therefore, the correct answer is option (4) - dissolved particles in a true solution cannot be removed by filtration. To further confirm this answer, one can conduct an experiment by passing a true solution through a filter. Since the dissolved particles are molecularly dispersed, they will pass through the filter, while only larger particles or impurities will be trapped.
In a true solution, the dissolved particles cannot be seen with the naked eye. They are typically individual molecules or ions and are evenly distributed throughout the solvent. Therefore, option (1) is incorrect.
Since the dissolved particles are typically individual molecules or ions, they will not settle out on standing. Therefore, option (2) is also incorrect.
The dissolved particles in a true solution can be solids, liquids, or gases, depending on the nature of the solution. So, option (3) is incorrect as well.
However, one characteristic of a true solution is that the dissolved particles are so small that they cannot be removed by filtration. Therefore, option (4) is correct.