Answer
64.8k+ views
Hint:
The percentage of any solution is generally expressed in three ways: as ‘percentage by mass’ or as ‘percentage by volume’ or as ‘mass by volume’.
Percentage by mass is weight/ weight or w/ w and percentage by volume is weight/ volume or w/ v.
Complete step by step answer:
The concentration of a solution represents the amount or quantity of the solute which is dissolved in a known amount of the solvent or solution. The concentration of any solution can be usually expressed in various common ways.
One of these common ways to express concentration of a solution is the percentage of a solution.
In case of a solid dissolved in a liquid, the percentage by mass denotes the mass of the solute in grams which is present in 100 g of the solution. This means it is weight/ weight or w/ w. For example, if the concentration of sodium carbonate is expressed as a 10 % solution of sodium carbonate by mass, then it means that 10 grams of sodium carbonate are present in 100 grams of the solution.
In case of a solid dissolved in a liquid, the percentage by volume denotes the mass of the solute in grams which is present in 100 mL of the solution. This means it is weight/ volume or w/ v. For example, if the concentration of sodium carbonate is expressed as 10 % solution of sodium carbonate by volume, then it means that 10 grams of sodium carbonate are present in 100 millilitres of the solution.
In case of a liquid dissolved in a liquid, the percentage by mass has the same meaning but the percentage by volume denotes the volume of the liquid solute in ${\text{c}}{{\text{m}}^{\text{3}}}$ present in 100 ${\text{c}}{{\text{m}}^{\text{3}}}$ of the solution. This means it is volume/ volume or v/ v.
Therefore, the statement ‘30 % solution of \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] is marketed as ‘100 volume’ hydrogen peroxide’ is correct as 30 % solution of \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] means 30 grams of hydrogen peroxide present in 100 mL of the solution. It is not because 1L of 30 % \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] will give 100 mL of oxygen at STP. Also, 1 millilitre of 30 % \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] will give 100 mL of oxygen at STP.
So, the assertion is correct and reason is incorrect and so the correct option is C.
Note:
Concentration of a solution can also be expressed in terms of molarity and normality.
Molarity represents the number of moles of the solute which is dissolved per litre of the solution while normality represents the number of gram equivalents of the solute which is dissolved per litre of the solution.
The percentage of any solution is generally expressed in three ways: as ‘percentage by mass’ or as ‘percentage by volume’ or as ‘mass by volume’.
Percentage by mass is weight/ weight or w/ w and percentage by volume is weight/ volume or w/ v.
Complete step by step answer:
The concentration of a solution represents the amount or quantity of the solute which is dissolved in a known amount of the solvent or solution. The concentration of any solution can be usually expressed in various common ways.
One of these common ways to express concentration of a solution is the percentage of a solution.
In case of a solid dissolved in a liquid, the percentage by mass denotes the mass of the solute in grams which is present in 100 g of the solution. This means it is weight/ weight or w/ w. For example, if the concentration of sodium carbonate is expressed as a 10 % solution of sodium carbonate by mass, then it means that 10 grams of sodium carbonate are present in 100 grams of the solution.
In case of a solid dissolved in a liquid, the percentage by volume denotes the mass of the solute in grams which is present in 100 mL of the solution. This means it is weight/ volume or w/ v. For example, if the concentration of sodium carbonate is expressed as 10 % solution of sodium carbonate by volume, then it means that 10 grams of sodium carbonate are present in 100 millilitres of the solution.
In case of a liquid dissolved in a liquid, the percentage by mass has the same meaning but the percentage by volume denotes the volume of the liquid solute in ${\text{c}}{{\text{m}}^{\text{3}}}$ present in 100 ${\text{c}}{{\text{m}}^{\text{3}}}$ of the solution. This means it is volume/ volume or v/ v.
Therefore, the statement ‘30 % solution of \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] is marketed as ‘100 volume’ hydrogen peroxide’ is correct as 30 % solution of \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] means 30 grams of hydrogen peroxide present in 100 mL of the solution. It is not because 1L of 30 % \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] will give 100 mL of oxygen at STP. Also, 1 millilitre of 30 % \[{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\] will give 100 mL of oxygen at STP.
So, the assertion is correct and reason is incorrect and so the correct option is C.
Note:
Concentration of a solution can also be expressed in terms of molarity and normality.
Molarity represents the number of moles of the solute which is dissolved per litre of the solution while normality represents the number of gram equivalents of the solute which is dissolved per litre of the solution.
Recently Updated Pages
Write a composition in approximately 450 500 words class 10 english JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Arrange the sentences P Q R between S1 and S5 such class 10 english JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What is the common property of the oxides CONO and class 10 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What happens when dilute hydrochloric acid is added class 10 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
If four points A63B 35C4 2 and Dx3x are given in such class 10 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
The area of square inscribed in a circle of diameter class 10 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Other Pages
A boat takes 2 hours to go 8 km and come back to a class 11 physics JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
In the ground state an element has 13 electrons in class 11 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Electric field due to uniformly charged sphere class 12 physics JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
According to classical free electron theory A There class 11 physics JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Excluding stoppages the speed of a bus is 54 kmph and class 11 maths JEE_Main
![arrow-right](/cdn/images/seo-templates/arrow-right.png)