In a chemistry lab, Rina took some mercury and water in two test tubes separately. Then she drained off both the liquids and on observing the empty test tubes, found some differences. Can you guess what the difference is? Explain with appropriate reasons

Open in App

Solution

When the test tube containing water(H₂O) is drained off, water droplets are visible on the inner surface of the test tube.
Whereas when the test tube containing mercury(Hg) is drained off, no droplets will be visible. It will be completely dry.
This is because in water adhesive forces are more stronger than cohesive forces.
Whereas in the case of mercury cohesive forces are more stronger than adhesive forces.
Cohesive forces: These are the type of forces that exist between similar types of molecules of a substance.
For example, Attraction between molecules of water
Adhesive forces: These are the type of forces that exist between different types of molecules of a substance.
For example, The attraction between paint and water molecules.

Suggest Corrections

Similar questions

Q. Boojho took some grains of boiled rice in test tube 'A', and Paheli took boiled and chewed rice in test tube 'B'. Both of them poured 1 – 2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

Question 20
Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in test tube ‘B’. Both of them poured 1 - 2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.

Q. Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in test tube ‘B’. Both of them poured 1 – 2 drops of iodine solution into the test tube and observed the colour change.

What colour change would they have observed? Give reasons for your answer. [3 marks]

Take three test tubes and label them as A, B and C. Fill $\frac{3}{4}$ th of each with water. Keep a snail in test tube A, a water plant in test tube B and in C, keep both snail and plant. In which of these test tubes $C O_{2}$ (carbon dioxide) level will be higher? What does this experiment show? Explain what happens in each test tube separately. [5 MARKS]

Join BYJU'S Learning Program