Assertion & Reason Test: Solutions
15 Questions MCQ Test Chemistry Class 12 | Assertion & Reason Test: Solutions
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Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : Molarity of a solution in liquid state changes with temperature.
Reason : The volume of a solution changes with change in temperature.
Assertion : Molarity of a solution in liquid state changes with temperature.
Reason : The volume of a solution changes with change in temperature.
Assertion and reason both are correct statements and reason is the correct explanation of assertion. Volume of solutions Is a function of temperature which varies with temperature. Hence, the molarity of solution in liquid state changes with temperature.
Molarity = moles of Solute/Volume of solution litra
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : Molarity of a solution in liquid state changes with temperature.
Reason : The volume of a solution changes with change in temperature.
Assertion : Molarity of a solution in liquid state changes with temperature.
Reason : The volume of a solution changes with change in temperature.
A molar solution is more concentrated than molal solution because 1 molar solution contains 1 mole of solute in 1 litre of the solution which include both solute and solvent.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : If a liquid solute more volatile than the solvent is added to the solvent, the vapour pressure of the solution may increase i.e., ps > po.
Reason : In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.
Assertion : If a liquid solute more volatile than the solvent is added to the solvent, the vapour pressure of the solution may increase i.e., ps > po.
Reason : In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.
Both the solute and solvent will form the vapours but vapour phase will become richer in the more volatile component.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): Molarity of 0.1 N solution of HCl is 0.1 M.
Reason (R): Normality and molarity of a solution are always equal.
Normality and molarity of a solution are not always equal. Normality depends on chemical equivalent of the substance while molarity depends on the molecular mass of the substance.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : If one component of a solution obeys Raoult’s law over a certain range of composition, the other component will not obey Henry’s law in that range.
Reason : Raoult’s law is a special case of Henry’s law.
Raoult's law holds over the entire concentration range x = 0 to 1 in a binary solution then, for the second component, the same must also hold.
If deviations from the ideal are not too large, Raoult's law is still valid in a narrow concentration range when approaching x = 1. for the majority phase (the solvent) The solute also shows a linear limiting law, but with a different coefficient. This law is known as Henry's Law.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): Molarity of a solution changes with temperature.
Reason (R): Molarity is dependent on volume of solution.
As molarity is dependent on volume of solution and volume rises with increase in temperature. Molarity is inversely proportional to temperature. So, as temperature increases, volume increases and molarity decreases.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components.
Reason : The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.
Non-ideal solutions with positive deviation i.e., having more vapour pressure than expected, boil at lower temperature while those with negative deviation boil at higher temperature than those of the components.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): Molarity of a solution in liquid state changes with temperature.
Reason (R): The volume of a solution changes with change in temperature.
Molarity changes with temperature because volume changes with temperature.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : When methyl alcohol is added to water, boiling point of water increases.
Reason : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.
Elevation of boiling-point describes that the boiling point of a liquid (a solvent) will be higher when another compound is added to it, meaning that a solution has a higher boiling point than a pure solvent.
This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.
When methanol is added to water, the boiling point of water decreases.
When a more volatile solute is added to the volatile solvent vapour pressure of solvent increases due to an elevation in boiling point colligative property.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): An ideal solution obeys Henry’s law.
Reason (R): In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute solvent interaction.
An ideal solution obeys Raoult’s law.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : When NaCl is added to water a depression in freezing point is observed.
Reason : The lowering of vapour pressure of a solution causes depression in the freezing point.
On addition of non-volatile solute (viz. NaCl) to water, NaCl solution is formed. Due to the relatively lesser number of water molecules at the surface of liquid, the solution exerts a lower vapour pressure as compared to that of pure water. It is because of this lowering of vapour pressure that a depression in the freezing point of water is observed.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): Dimethyl ether is less volatile than ethyl alcohol.
Reason (R): Dimethyl ether has greater vapour pressure than ethyl alcohol.
Dimethyl ether is more volatile than ethyl alcohol.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion : When a solution is separated from the pure solvent by a semi- permeable membrane, the solvent molecules pass through it from pure solvent side to the solution side
Reason : Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.
Assertion and reason both are correct statements but reason is not the correct explanation of assertion.
When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. Solvent molecules always flow frim lower concentration to higher concentration of solution.
Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.
Assertion (A): Vapour pressure increase with increase in temperature.
Reason (R): With increase in temperature, more molecules of the liquid can go into vapour phase.
Vapour pressure increase with increase in temperature because more molecules of the liquid can go into vapour phase with increase in temperature.
Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion (A): Elevation in boiling point is a colligative property.
Reason (R): Boiling point elevation in a dilute solution is directly proportional to the molar concentration of the solute in a given solvent and is independent of the nature of the solute.
Elevation in boiling point is a colligative property. It is directly proportional to molarity.
∆Tb = Kb × m
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