Solute and solvent

Correct answer: A. A solid metal can be the solvent in brass

A solvent is the component that provides the main medium for dissolving the solute. Its physical state need not be liquid. In brass, a solid metal forms the main medium and another metal is distributed through it. The other examples involve water or another liquid, so they do not show a solid solvent.

Correct answer: A. Air

Air is a mixture of gases, mainly nitrogen with smaller amounts of other gases. The solute and solvent are therefore both gases, so it is a gas-in-gas solution. In soda water the solute is gas but the solvent is liquid; salt water is solid in liquid, and hydrogen in palladium is gas in solid.

Correct answer: A. Salt in water

The governing idea is to compare the physical states of the solute and solvent. In salt water, salt is a solid solute and water is a liquid solvent, so their states are different and the mixture is a solid-in-liquid solution. Air contains gaseous components, brass contains solid components, and water-alcohol is liquid-in-liquid. Hence option A is correct.

Correct answer: A. It is the main medium in which solute is uniformly distributed

The governing concept is the role of the solvent in a solution. A solvent is the substance or medium in which the solute dissolves and becomes uniformly distributed. Its state need not be liquid, and it need not be water; a solid can act as the solvent in a solid solution such as an alloy. Therefore, option A is correct. Options B and C impose false state restrictions, while D contradicts the usual larger amount of solvent.

Correct answer: A. Gas, liquid, solid

The concept is that the solvent is usually the component present in the larger amount and its physical state determines the solution’s state. In air, the major component is gaseous, so the solvent is a gas. In salt water, water is the liquid solvent. In brass, copper is commonly the major metal and acts as the solid solvent. Thus the sequence is gas, liquid, solid, making A correct; the other sequences misassign at least one solvent state.

Correct answer: A. When it is present in smaller amount and uniformly dissolved in another component

The governing concept is the distinction between solute and solvent. A solute is the substance that dissolves in the solvent and is commonly present in the smaller amount. Uniform distribution is essential because it indicates formation of a solution. The larger component is generally the solvent, while a separate layer indicates immiscibility rather than a true solution. Therefore A correctly describes a solute; B and C describe the solvent more closely, and D describes incomplete mixing.

Correct answer: A. When it is present in larger amount and spreads the solute uniformly

The governing concept is the function of a solvent in a solution. The solvent is the continuous or main medium in which the solute dissolves and becomes uniformly distributed. It is often present in the larger amount, although amount alone is not the complete definition. Settling at the bottom describes a possible undissolved substance, colour alone is irrelevant, and never dissolving anything contradicts the role of a solvent. Hence A is correct.

Correct answer: B. A substance dissolves in water to form a homogeneous liquid

The governing concept is that water is a solvent when another substance dissolves in it and becomes uniformly distributed. This produces a homogeneous aqueous solution, as described in B. A quantity comparison alone is insufficient to establish the role, especially when the water is not the main medium. A separate layer indicates immiscibility, while sand settling indicates a suspension containing undissolved particles. Therefore B is the only option showing genuine dissolution in water.

Correct answer: B. Copper

In an alloy or solid solution, the component present in the larger amount is generally treated as the solvent, while the smaller component is the solute. Copper is stated to be present in greater quantity in this brass, so copper is the solid solvent and zinc is the solute. Water and gases are not components of the alloy described here. Therefore, option B is correct.

Correct answer: A. Non-aqueous solution

The word aqueous specifically means that water is the solvent. If ethanol is the solvent, the solution may still be liquid, but it is called non-aqueous because water is not the dissolving medium. The physical state of a solution and the aqueous or non-aqueous label describe different properties. Therefore, option A is correct; options C and D incorrectly describe its state.

Correct answer: A. In soda water, the solute is a gas and the solvent is a liquid

Soda water contains carbon dioxide dissolved in water. Carbon dioxide is gaseous, while water is liquid, so option A correctly states the solute and solvent states. Salt water instead has a solid salt solute and liquid water solvent. Air mainly consists of gaseous components, not a liquid solute and solid solvent. Therefore B, C, and D are incorrect.

Correct answer: A. The component in larger amount is generally the solvent

In a typical solution, the component present in the larger amount is generally identified as the solvent, while the component in the smaller amount is the solute. This is a useful school-level rule when the mixture is uniform and the dissolving relationship is evident. Brightness, price, and the order of addition have no scientific role in defining these terms.

Correct answer: A. Solvent

When two liquids mix uniformly to form a liquid solution, the component present in the larger amount is generally called the solvent, and the smaller component is called the solute. A precipitate is an insoluble solid produced during some reactions, while an insoluble particle does not form a true solution. Therefore, option A is correct.

Correct answer: A. The substance that dissolves in the solvent

A solute is the component that dissolves in a solvent to form a solution, so option A is correct. A solute is commonly present in a smaller quantity, but amount is not its defining property; in some mixtures the proportions can vary. Solutes may be solids, liquids, or gases. Thus B, C, and D incorrectly describe amount, insolubility, or state.

Correct answer: A. The medium in which solute dissolves

A solvent is the medium in which a solute dissolves and becomes distributed, so option A is correct. The solvent is commonly present in the larger amount, but it is not always a solid and need not be water. Settling describes undissolved particles, and providing colour alone does not define a solvent; thus B, C and D are unsuitable.

Correct answer: A. Solute dissolves, solvent provides the medium, solution forms

The governing concept is the relationship between solute, solvent, and solution. The solute is the substance that dissolves, while the solvent is the medium that dissolves it. As solute particles spread uniformly through the solvent, a homogeneous solution forms. Therefore option A gives the correct sequence. B reverses the roles and says the solution breaks; C describes settling, and D gives an impossible order.

Correct answer: A. Iodine

The governing definition is that a solute is the component that gets dissolved, whereas the solvent is the component that provides the dissolving medium. In the stated example, iodine dissolves in ethanol and is present in the smaller amount, so iodine is the solute and ethanol is the solvent. Water is not mentioned and cannot be selected. Thus option A is correct.

Correct answer: B. Gaseous solvent

The governing concept is the distinction between the substance being dispersed and the medium that receives it. Camphor is the solid substance dispersed in the surrounding nitrogen, so camphor is the solute. Nitrogen provides the gaseous medium and is therefore the gaseous solvent. It is not a solid solvent, and it is not the solute. Thus option B is correct.

Correct answer: C. In hydrogen in palladium hydrogen is solute and palladium is solvent

The governing rule is that the solute is the substance dissolved, while the solvent is the continuous medium that dissolves it. In hydrogen dissolved in palladium, hydrogen occupies the dissolved component role and palladium provides the solid medium, so hydrogen is the solute and palladium is the solvent. Thus C is correct. In air nitrogen is the major solvent, and in soda water and salt water water is the solvent, so A, B, and D reverse the roles.

Correct answer: B. First solute state and then solvent state

The governing naming rule is written as solute in solvent. Therefore, in a phrase such as solid in liquid, the first state describes the solute and the second state describes the solvent. For example, salt in water is solid in liquid. Option A reverses these roles, while C and D describe neither the standard naming rule nor the relevant physical states.

Correct answer: A. In the first the solvent is liquid, in the second the solvent is gas

The governing concept is the order of solute and solvent in a solution description. Gas in liquid means a gas is the solute and a liquid is the solvent, as carbon dioxide in soda water. Liquid in gas means a liquid is the solute and a gas is the solvent, such as a vapour mixed with air. Thus the solvent states differ exactly as option A states; the other choices confuse or deny the component roles.

Correct answer: A. Brass

The governing concept is the state of the solvent and the resulting solution. Brass is a solid alloy: one solid metal acts as the solute and another solid metal provides the solvent medium. Therefore both the solute and the final solution are solid. Soda water and oxygen in water are liquid solutions, while camphor in nitrogen is a gaseous solution, so the alternatives do not satisfy both conditions.

Correct answer: B. The solvent is gas

The governing naming pattern is solute in solvent: the first term identifies the solute and the final term identifies the solvent. Therefore, if the last word is gas, the solvent is gaseous. The whole solution is generally classified as gaseous because the solvent forms its continuous phase. This does not require the solute also to be a gas; it could be solid or liquid, so A, C, and D are incorrect.

Correct answer: C. Solid

The governing concept is that the final word in a solution category identifies the solvent. Since the solvent is the continuous phase, the overall state of the solution generally follows the solvent’s state. Thus, when the final word is solid, the solution is classified as solid. The solute may have started as a gas, liquid, or solid, but that does not change the category determined by the solvent; therefore C is correct.

Correct answer: A. Water is generally the solvent in it

The governing definition is that an aqueous solution is a solution in which water acts as the solvent. For example, salt, sugar, or oxygen may dissolve in water, while water remains the solvent. The word aqueous does not require the solute to be water, and it does not describe the solution as always solid or gaseous. Therefore option A is the most accurate statement.