Which statement about paper chromatography is correct?1 pointa. A solvent is needed to dissolve the paper.b. Paper chromatography separates mixtures of solvents.c. The solvent should cover the baseline.d. The baseline should be drawn in pencil
Question
Which statement about paper chromatography is correct?1 pointa. A solvent is needed to dissolve the paper.b. Paper chromatography separates mixtures of solvents.c. The solvent should cover the baseline.d. The baseline should be drawn in pencil
Solution
To answer the question, we will evaluate each statement and determine which one is correct.
a. A solvent is needed to dissolve the paper. This statement is incorrect. In paper chromatography, a solvent is used to separate the components of a mixture, not to dissolve the paper.
b. Paper chromatography separates mixtures of solvents. This statement is incorrect. Paper chromatography is used to separate mixtures of substances, not specifically solvents.
c. The solvent should cover the baseline. This statement is correct. In paper chromatography, the solvent should be added to the container in a way that it covers the baseline, which is the starting point for the separation.
d. The baseline should be drawn in pencil. This statement is incorrect. The baseline in paper chromatography should be drawn using a pen or marker, not a pencil. This is to ensure that the baseline does not dissolve or smudge when the solvent is added.
Therefore, the correct statement about paper chromatography is: c. The solvent should cover the baseline.
Similar Questions
What is chromatography used to separate?An insoluble solid from a liquidTwo or more liquids with different boiling pointsDifferent substances dissolved in a liquidTwo or more different gases2Which of the following statements about paper chromatography is not true?Less soluble substances travel further up the paperSubstances are separated based on how attracted they are to each phaseThe stationary phase is the paperThe mobile phase is the solvent3What are Rf values useful for?To determine how much solvent to use in the chromatography procedureTo calculate how much paper to useTo identify unknown samples by comparing them with known samplesTo determine the number of different substances in a solvent4How is the Rf value of a substance calculated?Distance moved by substance divided by distance moved by solventDistance moved by solvent minus distance moved by substanceDistance moved by solvent divided by distance moved by substanceDistance moved by substance multiplied by distance moved by solvent5In the core practical ‘Paper chromatography to investigate the composition of ink’, a line is drawn at the bottom of the paper onto which spots of known ink colourings plus an unknown sample are placed. There are several key points to remember when setting up this practical. Which of the following is incorrect? The line must be above the water levelThe line must be in penThe sides of the paper must not touch the beakerThe sample spots should not spread out too far6On a paper chromatogram only one spot is produced. What does this tell you? The paper was not large enoughThe substance being separated is an impure substanceToo much solvent was usedThe substance being separated is a pure substance
What is the principle of the paper chromatography ?a.Partitionb.Adsorptionc.A and Bd.None of the above
What is the basic principle of paper chromatography?a.Differential adsorption of componentsb.Difference in the colour of the componentsc.Difference in the boiling points of the componentsd.Difference in the solubility of the components
Paper chromatography involves a stationary phase. What is the stationary phase in paper chromatography?1 pointa. Beakerb. Dyec. Paperd. Solvent
b) In chromatography, the ingredients ofa mixture rise up to a limited heightwhen water rises up to the upper endof the paper.
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