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 Saturated solution giving examples.
Calculate the amount of carbon dioxide that could be produced when 2 moles of carbon are burnt in 16 g of dioxygen.
Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040 (assume the density of water to be one).
What are the favourable qualities given to gold when it is alloyed with copper or silver for the purpose of making ornaments?
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?
Sulphuric acid reacts with sodium hydroxide as follows:
\[\ce{H2SO4 + 2NaOH -> Na2SO4 + 2H2O}\]
When 1 L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is:
(i) 0.1 mol L–1
(ii) 7.10 g
(iii) 0.025 mol L–1
(iv) 3.55 g
Which of the following solutions have the same concentration?
(i) \[\ce{20 g of NaOH in 200 mL of solution}\]
(ii) \[\ce{0.5 mol of KCl in 200 mL of solution}\]
(iii) \[\ce{40 g of NaOH in 100 mL of solution}\]
(iv) \[\ce{20 g of KOH in 200 mL of solution}\]
What is the difference between molality and molarity?
Molarity of liquid HCl will be if the density of the solution is 1.17 g/cc.
