What is the use of test tube clamps in lab?
To hold or pick up small items
To hold hot crucibles
To hold hot test tubes
Used for stirring
These test tube clamps are used for holding hot test tubes.
Take cold water, normal water and hot water in three test tubes. Drop a small size of magnesium ribbon in each test tube and add one drop of phenolphthalein in each test tube. In which test tube will pink colour appear sharply?
ake a mixture of iron fillings and sulphur powder in a test tube. Heat the test tube strongly till the mixture becomes red hot. Let the mixture cool and add dil. sulphuric acid to it. Which statement is true for the content of the test tube after the experiment?
Take a mixture of iron fillings and sulphur powder in a test tube. Heat the test tube strongly till the mixture becomes red hot. Let the mixture cool and add dil. sulphuric acid to it. Which statement is true for the content of the test tube after the experiment?