Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
- I2 (Solid)
- U.V. Light
- Visualisation agent as a component of mobile phase
- Spraying of an appropriate reagent
The Correct Option is C
Solution and Explanation
The correct answer is (C) : Visualisation agent as a component of mobile phase.
The function of mobile phase is to carry the components present on TLC.
Top Questions on Chromatography and Its Principles
- Given below are two statements:
Statement (I): In partition chromatography, the stationary phase is a thin film of liquid present in the inert support.
Statement (II): In paper chromatography, the material of paper acts as a stationary phase.
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Questions Asked in JEE Main exam
- In a microscope of tube length $10\,\text{cm}$ two convex lenses are arranged with focal lengths $2\,\text{cm}$ and $5\,\text{cm}$. Total magnification obtained with this system for normal adjustment is $(5)^k$. The value of $k$ is ___.
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- Optical Instruments
Which one of the following graphs accurately represents the plot of partial pressure of CS₂ vs its mole fraction in a mixture of acetone and CS₂ at constant temperature?
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- Organic Chemistry
- Let \( ABC \) be an equilateral triangle with orthocenter at the origin and the side \( BC \) lying on the line \( x+2\sqrt{2}\,y=4 \). If the coordinates of the vertex \( A \) are \( (\alpha,\beta) \), then the greatest integer less than or equal to \( |\alpha+\sqrt{2}\beta| \) is:
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- Coordinate Geometry
- Three charges $+2q$, $+3q$ and $-4q$ are situated at $(0,-3a)$, $(2a,0)$ and $(-2a,0)$ respectively in the $x$-$y$ plane. The resultant dipole moment about origin is ___.
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Let \( \alpha = \dfrac{-1 + i\sqrt{3}}{2} \) and \( \beta = \dfrac{-1 - i\sqrt{3}}{2} \), where \( i = \sqrt{-1} \). If
\[ (7 - 7\alpha + 9\beta)^{20} + (9 + 7\alpha - 7\beta)^{20} + (-7 + 9\alpha + 7\beta)^{20} + (14 + 7\alpha + 7\beta)^{20} = m^{10}, \] then the value of \( m \) is ___________.- JEE Main - 2026
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Concepts Used:
Qualitative Analysis
Qualitative Analysis involves the systematic identification of ions present in a mixture. It focuses on the properties and reactions of ions, particularly cations. The process begins with the systematic analysis of cations, where precipitation reactions are utilized to sequentially remove cations from a mixture. Students learn to recognize characteristic reactions and observe precipitates, helping identify specific ions.
Also Read: Quantitative Ananlysis
In the context of salt analysis, students employ various techniques to identify cations and anions in inorganic salts. This step-by-step process aids in understanding the composition of the given salts. Additionally, qualitative chemical analysis explores the subjective investigation of substances, examining their chemical properties.
Read More: Difference between Qualitative and Quantitative Research
Principles of Qualitative Analysis cover the physical and chemical properties of different elements, ions, and compounds. This knowledge is essential for providing a foundation for understanding the behavior of substances in chemical reactions. Practical applications, such as salt analysis, further reinforce theoretical concepts in qualitative analysis.