Advertisements
Advertisements
प्रश्न
A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig.2.3. The filter paper was removed when the water moved near the top of the filter paper.
(i) What would you expect to see, if the ink contains three different coloured components?
(ii) Name the technique used by the child.
(iii) Suggest one more application of this technique.
Advertisements
उत्तर
(i) The components of the ink will travel with water and we would see three bands on the filter paper at various lengths.
(ii) The technique is called chromatography.
(iii) Separation of pigments present in chlorophyll.
APPEARS IN
संबंधित प्रश्न
Explain the term mole fraction.
Solve the following problem:
Write the following number in ordinary decimal form:
43.71 × 10−4
Solve the following problem:
Perform the following calculation. Round off your answer to two digits.
`33/(9.00xx10^-4)`
Perform the following calculation. Round off your answer to three digits.
(8.39 107) (4.53 109)
A 1.000 mL sample of acetone, a common solvent used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g.
The following values were obtained when the acetone-filled bottle was weighed: 38.7798 g, 38.7795 g and 38.7801 g. How would you characterise the precision and accuracy of these measurements if the actual mass of the acetone was 0.7791 g?
Name the process associated with the following
A drop of ink placed on the surface of water contained in a glass spreads throughout the water.
What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?
If 500 mL of a 5 M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?
What is the difference between molality and molarity?
