When comparing analytical methods, it's important to consider factors like the time required for analysis and the amount of sample needed. Two broad categories are classical methods and spectroscopic methods.

Spectroscopic vs Classical Methods

Classical methods of chemical analysis often involve techniques like gravimetric analysis, titrations, and other wet chemistry techniques. These methods typically require manual steps, multiple reagents, and can be time-consuming. They also often require a larger quantity of the sample to get accurate and measurable results.

Spectroscopic methods, on the other hand, utilize the interaction of electromagnetic radiation with matter to analyze the sample. These methods include techniques like UV-Vis spectroscopy, Infrared (IR) spectroscopy, Atomic Absorption Spectroscopy (AAS), etc. Spectroscopic instruments can often analyze samples very quickly, sometimes within seconds or minutes. Furthermore, these methods are often highly sensitive and can provide accurate results using only a very small amount of sample, sometimes even micro-liters or milli-grams.

Based on this understanding, we can compare the two types of methods:

Let's look at the given statements:

• Statement 1: Spectroscopic methods require less time and more amount of sample than classical methods. This is incorrect because spectroscopic methods require less sample.
• Statement 2: Spectroscopic methods require more time and more amount of sample than classical methods. This is incorrect because spectroscopic methods require both less time and less sample.
• Statement 3: Spectroscopic methods require less time and less amount of sample than classical methods. This statement accurately reflects the general characteristics of spectroscopic methods compared to classical methods.

Therefore, the correct statement is that spectroscopic methods require less time and less amount of sample than classical methods.