Question

Which of the following reagent is not use in qualitative and quantitative chemical analysis?

• A. EDTA
• B. Cupron
• C. DMG
• D. D-penicillamine

Hint:

Remember some famous analytical reagents: EDTA for complexometric titration, DMG for nickel detection, and Cupron for metal analysis. If an option is more common in medicinal chemistry, it is less likely to be a routine analytical reagent.

Answer 1

The Correct Option is D

Step 1: Understand the role of analytical reagents.
In qualitative and quantitative chemical analysis, special reagents are used to detect, separate, or estimate metal ions and other substances. These reagents usually form colored complexes or precipitates, which help in identification and measurement. Step 2: Examine the common analytical reagents.
EDTA is a very important complexometric reagent widely used in quantitative analysis, especially in titrations for hardness of water and estimation of metal ions.
Cupron is used as an analytical reagent for certain metal ions. It is useful in inorganic analysis.
DMG (dimethylglyoxime) is a well-known reagent used for the detection and estimation of nickel, as it forms a characteristic red precipitate with \( \text{Ni}^{2+} \).
Step 3: Identify the reagent not commonly used in chemical analysis.

• (A) EDTA: Used in quantitative chemical analysis.
• (B) Cupron: Used as an analytical reagent.
• (C) DMG: Used in qualitative as well as quantitative analysis of nickel.
• (D) D-penicillamine: Not commonly used as a standard reagent in qualitative and quantitative chemical analysis.

D-penicillamine is better known in coordination chemistry and medicinal applications rather than as a routine analytical reagent used in standard qualitative and quantitative analysis. Step 4: Conclusion.
Hence, the reagent which is not used in qualitative and quantitative chemical analysis is D-penicillamine.
Final Answer:D-penicillamine.