Explanation

The hydrocarbon decolorizes aqueous bromine, which means it contains C=C double bonds (alkene).

To be a liquid at room temperature, it must be a higher alkene.

C₁₀H₂₀ fits the general formula of alkenes (CₙH₂ₙ) and would be a liquid at room temperature.

Explanation

HI (hydrogen iodide) is the least stable of the hydrogen halides due to its weakest H–I bond.

On heating (e.g., with a hot glass rod), it readily decomposes into H₂ and I₂.

Explanation

Atomic Fluorescence Spectroscopy (AFS) is primarily used for the detection and quantification of metal ions, especially at trace levels.

It is highly sensitive and is commonly applied in environmental, biological, and food samples to measure metals like mercury, arsenic, selenium, etc.

Explanation

Careful sample preparation in analytical chemistry is essential because it:

- Minimizes contamination, which can lead to inaccurate results.

- Ensures the sample is representative of the material being analyzed.

- Prepares the sample in a form suitable for the instrument (e.g., correct pH, concentration, solvent).

Explanation

Derivative spectroscopy is commonly used in UV-Visible spectroscopy to:

- Resolve overlapping peaks

- Improve detection of minor spectral features

- Enhance qualitative analysis by identifying small changes in absorbance

This technique is especially helpful in complex mixtures or closely related compounds, where normal UV-Vis spectra might not show clear differences.

Explanation

Fourier transform is a mathematical technique used to process signals in many spectroscopic methods, including nuclear magnetic resonance (NMR) spectroscopy.

This is because NMR data is collected as an interferogram, which needs to be converted into a readable spectrum using a Fourier transform. 

Explanation

High-performance liquid chromatography (HPLC) separates components in a mixture by partitioning between a stationary phase and a mobile phase. 

Partitioning:

In HPLC, the sample mixture is introduced into a column packed with a stationary phase (a solid material) and a liquid mobile phase flows through the column.

Differential retention:

Different components in the mixture have different affinities for the stationary phase and the mobile phase.

Separation:

As the mobile phase flows through the column, the components with a stronger affinity for the stationary phase will spend more time interacting with it,

Resulting in slower movement through the column, while the components with a weaker affinity will move faster

Explanation

In derivative spectroscopy, a zero-crossing point occurs where the derivative spectrum crosses the zero axis,

Indicating a change in the slope of the original spectrum.

This change in slope corresponds to a peak inflection point,

The point where the curvature of the original spectrum changes from concave up to concave down, or vice versa. 

Explanation

Infrared (IR) spectroscopy is excellent at identifying functional groups in a molecule,

like C=O and O-H bonds, by detecting their characteristic vibrational frequencies.

It can also help identify a compound by comparing its IR spectrum to reference spectra of known compounds.

However, IR spectroscopy does not provide information about the molecular mass of a compound. 

Explanation

Ion exchange resins are typically synthetic polymers,

But zeolites are naturally occurring or synthetic aluminosilicates used as ion exchangers, especially in water softening.  

- Activated carbon is for adsorption.  

- Graphite and silica gel have other applications.