Question

ASSERTION
Acidimetry and alkalimetry are the terms used in volumetric analysis.
REASON
The reactant left after the chemical reaction is called the limiting reagent.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
C. Assertion is correct but reason is incorrect.
D. Both assertion and reason are incorrect.

Answer 1

Volumetric analysis is a method of quantitative analysis by which we can determine the concentration of a substance that has to be analyzed. This substance is known as an analyte. A titrant has to be prepared in the form of a solution which has a known concentration, this solution is known as a standard solution. Now this standard solution of known concentration has to be added to the analyte so that it reacts with it. By this method, we can determine the analyte’s concentration. The volume of the titrant that reacted with the analyte is termed as the titration volume.

Complete step by step answer:
We will analyze the assertion and reason one by one with an explanation.
ASSERTION: Acidimetry and alkalimetry are the terms used in volumetric analysis.
This is a correct statement as acidimetry and alkalimetry are a specific type of titrations which come under volumetric analysis. Firstly, let us discuss the acid-base titrations. Acid-base titrations are the ones in which we prepare a standard solution of acid or base and then use it to determine the unknown concentration of acid or base given by neutralizing it. An indicator is also used in this type of titration to monitor the progress of the acid-base reaction.
Now let us discuss acidimetry and alkalimetry
Acidimetry-In acidimetry the standard solution is made of acid and an unknown concentration of base is found out using this acid by neutralizing it with this solution of acid.
Alkalimetry-In alkalimetry the standard solution is made of base and concentration of acid is found out by neutralizing it with a standard solution of base.
Hence the assertion is correct.
REASON: The reactant left after the chemical reaction is called the limiting reagent.
Let us know the definition of limiting reagent first. A limiting reagent is a reactant that is present in less quantity in the reaction and hence limits the quantity of product formed. Therefore, it gets consumed in the reaction. Hence, we can see that reason is wrong.

So, the correct answer is Option C.

Note: A common indicator that is used in acid-base titration is phenolphthalein for titration of a strong acid with a strong base.The reactant left after limiting reagent is consumed in a chemical reaction is called excess reactant.The endpoint in a titration refers to the point at which the indicator changes its color.