Question

Molar concentration $(M)$of any solution$=$
A.$\dfrac{No.\,of\,\,moles\,\,of\,solute}{Volume\,\,of\,\,solution\,\,in\,\,\,litre}\,$
B.$\dfrac{No.\,\,of\,\,gram\,\,equivalent\,\,of\,\,solute}{Volume\,\,of\,\,\,solution\,\,\,in\,\,\,litre}$
C.$\dfrac{No.\,\,of\,\,moles\,\,of\,\,solute}{Mass\,\,of\,\,solvent\,\,in\,\,kg}$
D.$\dfrac{No.\,\,of\,\,moles\,\,of\,\,any\,\,component}{Total\,\,no.\,\,of\,\,moles\,\,of\,\,all\,\,consituents}$

Answer 1

Hint: Molar concentration is expressed in terms of the molarity of a particular solution. The concentration of a solution is a measure of its solute divided by the volume of solution in$litre$or the volume of solvent in $kg$. Most commonly Concentration can be represented in both quantitative and quantitative terms.

Complete answer:In chemistry, the term concentration is very common. Concentration means how much of one component is mixed with another component. In solutions, this is a commonly used term that determines the amount of solute dissolved in a particular solvent where the solute gets dissolved and the solvent is one in which the solute dissolves.
Molar concentration or molarity is the number of moles of solute dissolved per $litre$ solution or the ratio of no. of moles of solute to the volume of the solution $litre$.
Therefore, the Molar concentration ($M$) of any solution$=\dfrac{No.\,of\,\,moles\,\,of\,solute}{Volume\,\,of\,\,solution\,\,in\,\,\,litre}\,$
When no. of gram-equivalents of solute is dissolved per $litre$ solution then it is called normality, therefore in (B), the ratio $\dfrac{No.\,\, of\,\, gram\,\, equivalent\,\, of\,\, solute}{Volume\,\, of\,\,\, solution\,\,\, in\,\,\, litre}$ represents the normality of any solution.
Again when the number of moles of solute dissolves in solvent $kg$then it is called molality of any solution, then in (C), the ratio $\dfrac{No.\,\,of\,\,moles\,\,of\,\,solute}{Mass\,\,of\,\,solvent\,\,in\,\,kg}$ denotes molality of any solution.
And finally, in (D), the ratio $\dfrac{No.\,\, of\,\, moles\,\, of\,\, any\,\, component}{Total\,\, no.\,\, of\,\, moles\,\, of\,\, all\,\,consituents}$is the mole fraction of any component present in the solution.

Thus, option (A) is correct.

Note: The term molarity, normality, and molality are very important terms in the mole concept, also we should understand the difference between them. It is found that normality and molarity are temperature dependent but molality does not depend on temperature.