1: Types of Solutions

Correct answer: A. Brass is an example of a solid solution

Explanation: Brass is a homogeneous mixture of metals in the solid state, so it is a solid solution. This demonstrates that solutions are not restricted to liquid mixtures such as salt water or vinegar. The other statements describe liquid solutions and therefore do not directly show the existence of a non-liquid solution.

Correct answer: A. Carbon dioxide is the solute in soda water

Explanation: Carbon dioxide is a gas, and in soda water it is the substance dissolved in liquid water; therefore it is a gaseous solute. Salt, sugar, and glucose are solid substances in their usual pure forms. This example proves that the term solute describes the role of a substance, not a compulsory solid state.

Correct answer: C. Solid solution

Explanation: A solution is homogeneous, and its broad physical classification is normally based on the state of its solvent. When the solvent is solid, the solution is classified as a solid solution. The solute could itself be solid, liquid, or gas; that does not change this broad classification. A suspension is heterogeneous, so option C is correct.

Correct answer: A. Ethanol in water

Explanation: In ethanol–water, ethanol is the solute and water is the solvent; both are liquids, so it is a liquid-in-liquid solution. Since the solvent is water, the solution is also described as an aqueous solution. Air is a gas mixture, brass is a solid solution, and chloroform in nitrogen has a gas as solvent, so none of those satisfies both conditions.

Correct answer: A. Because solute should be uniformly dispersed in a solution

Explanation: A true solution is homogeneous: its solute particles are dispersed uniformly at the molecular or ionic scale and are not seen as separate particles. Visible particles indicate that the substance has not dissolved completely and the mixture is non-uniform, such as a suspension. Solid substances can certainly be solutes, so B is false. Therefore A is correct.

Correct answer: A. A solution may have two or more components, a pure substance has one chemical component

Explanation: A solution is a homogeneous mixture, so it contains at least two components: a solute and a solvent. Their proportions may vary. A pure substance, in contrast, consists of one chemical species or compound with a fixed composition and is not a mixture. A solution is not necessarily an element, and its components are uniformly distributed. Hence A is correct.

Correct answer: D. Chloroform in nitrogen

Explanation: A solution is classified by the state of its solvent. In salt water, oxygen dissolved in water, and ethanol in water, water is the liquid solvent, so each is a liquid solution. In chloroform in nitrogen, nitrogen is the solvent and is gaseous; chloroform is the solute. Therefore, that mixture is a gas solution, specifically liquid in gas, not a liquid solution.

Correct answer: D. Oxygen in water

Explanation: A gaseous solution has a gas as its solvent. Air is a mixture of gases, while nitrogen acts as the gaseous solvent in both camphor in nitrogen and chloroform in nitrogen. In oxygen dissolved in water, however, water is the solvent and is liquid; oxygen is only the gaseous solute. Thus this example is a gas-in-liquid solution, not a gaseous solution.

Correct answer: D. Soda water

Explanation: A solid solution has a solid solvent. Brass is a solid alloy, palladium provides a solid solvent for dissolved hydrogen, and an amalgam is a solid alloy involving mercury and another metal. Soda water is carbon dioxide dissolved in water; water is liquid and acts as the solvent. Hence soda water is a liquid solution, not a solid solution.

Correct answer: B. Solvent is solid

Explanation: For the usual classification of solutions, the overall state of the solution follows the state of the solvent, which is the continuous medium. Therefore a solid solution has a solid solvent. This information alone does not tell us whether the solute is solid, liquid, or gas; all three possibilities exist. It also says nothing about water or heterogeneity. Hence B is the justified conclusion.

Correct answer: A. Solvent is gas

Explanation: A gaseous solution is classified as gaseous because its solvent, the continuous medium, is a gas. The solute need not be water and may be another gas, a vapour, or in suitable classification examples a very small amount of another state. A gaseous solution is homogeneous, not necessarily heterogeneous. Thus only option A follows from the given information.

Correct answer: A. Binary has two components and ternary has three components

Explanation: The prefixes provide the definition: “bi-” means two and “ter-” or “tri-” means three. A binary solution therefore contains two components, while a ternary solution contains three components. This classification counts components and does not describe whether the solution is solid, liquid, or gaseous. Consequently, options B, C, and D confuse the basis of classification. A is correct.

Correct answer: A. It may be a solution, but states are needed to know type

Explanation: Homogeneity means that the composition is uniform throughout the sample, which is a key property of a solution. However, homogeneity alone does not reveal whether the solvent is solid, liquid, or gas, nor does it identify the solute. Therefore the mixture may be a solution, but additional information about the components and their states is needed for a precise type. A is the careful conclusion.

Correct answer: A. First homogeneity, then solute-solvent, then states

Explanation: A sound identification procedure begins by checking whether the mixture is homogeneous, because a true solution must be uniform. Next, identify which component is the solute and which is the solvent, usually using amount and medium. Finally, compare their physical states to classify the solution as solid, liquid, or gaseous and to describe the solute–solvent combination. Therefore A gives the useful order.

Correct answer: A. Type of solution is identified from states of solute and solvent

Explanation: Solutions can be classified in several ways, and the physical type is identified by considering the states of the solute and solvent, especially the solvent that forms the continuous medium. Colour is not a defining criterion, water is not present as solvent in every solution, and a solid mixture may be heterogeneous. Hence option A states the correct basic principle.

Correct answer: B. Brass: solid in solid solution

Explanation: Brass is a solid alloy in which one metal is dissolved uniformly in another metal; therefore both the solute and solvent are treated as solids. Soda water is gas in liquid, not liquid in gas. Air is mainly a gas-in-gas solution rather than a solid-in-gas example, and salt water is solid salt in liquid water, not liquid in solid. Thus B is correct.

Correct answer: C. Liquid

Explanation: The solute is the component that is dissolved or distributed through the solvent. The question explicitly identifies that component as a liquid, while the metal serving as solvent is solid. Therefore the solute has liquid state, even though the resulting solution is classified as solid because its solvent is solid. The overall state must not be confused with the original state of the solute. C is correct.

Correct answer: D. Iodine in alcohol

Explanation: An aqueous solution is one in which water is the solvent. Glucose in water, salt in water, and carbon dioxide dissolved in water are therefore aqueous solutions. In iodine in alcohol, alcohol is the solvent and water is not the solvent, so the solution is non-aqueous. It is still a solution if iodine is uniformly dissolved. Hence D is correct.

Correct answer: B. The state of solution is generally decided by solvent

Explanation: The solvent forms the continuous medium of a solution, so the solution is generally described as solid, liquid, or gaseous according to the solvent’s state. The solute may have a different state: a gas can dissolve in a liquid, or a gas can occupy a solid lattice. Colour and temperature may affect appearance or solubility but do not define this basic classification. Thus B is correct.

Correct answer: A. It has three components

Explanation: A ternary solution is defined by the number of components, not by their physical state or by the presence of water. It contains exactly three components, which may be solids, liquids, gases, or a combination of these, provided they form a homogeneous solution. Two components describe a binary solution, while three gases and compulsory water are unnecessary restrictions.

Correct answer: B. When they permanently form separate layers

Explanation: A true solution is homogeneous, meaning its components are uniformly distributed throughout one phase. If two liquids remain as separate layers, they are immiscible and do not form a single homogeneous liquid solution. Colour is irrelevant, and simply being liquids does not guarantee miscibility. One uniform layer indicates mixing, whereas permanent separate layers indicate that the mixture is not a true liquid–liquid solution.

Correct answer: B. By the solvent

Explanation: The solvent is the continuous medium and therefore normally determines the overall physical class of a solution. If the solvent is solid, the mixture is classified as a solid solution even when the solute was originally liquid. Colour and smell are not classification rules. The solute state is still recorded separately as liquid in solid, but the overall state follows the solvent. Hence B is correct.

Correct answer: A. Binary has two components and ternary has three components

Explanation: Binary and ternary describe the number of components in a solution. “Binary” means two components, whereas “ternary” means three components. The terms do not require a particular physical state, solvent, or chemical substance: a binary solution may be solid, liquid, or gaseous, and the same is true of a ternary solution. Thus option A gives the exact distinction.

Correct answer: B. Solute

Explanation: In a homogeneous mixture of gases, the component present in the larger amount is conventionally treated as the solvent or continuous medium. Nitrogen is larger in amount, so it is the solvent in this simplified example. Oxygen, being present in the smaller amount and uniformly mixed, is the solute. It is neither a sediment nor a solid medium. Therefore B is correct.

Correct answer: B. Because water is not the solvent

Explanation: The adjective aqueous refers specifically to water as the solvent. A solution is non-aqueous when its solvent is another substance, such as alcohol, benzene, or a different liquid. It still contains a solute and may be homogeneous, liquid, solid, or gaseous depending on the system. Thus non-aqueous does not mean gas or heterogeneous; option B gives the correct reason.