A suitable method for the separation of pure naphthalene from sandy naphthalene is:
Important Questions on Is Matter around Us Pure?
Which of the following are NOT correct methods for separating the components of given mixtures?
I. The mixture of Iodine and sodium chloride by sublimation.
II. Plant pigments by chromatography.
III. Mixture of acetic acid and water by separating funnel.
IV. Oxygen, argon and nitrogen from air by fractional distillation.
At a refinery, petroleum is separated into several components by a process called fractional distillation using a fractionating column. Which of the following statement is incorrect about the process?
(I) Temperature decreases from the bottom to the top of the column
(II) At each level in the column only one compound is collected
(III) The fraction collecting at the top of the column is less volatile
(IV) The fraction with the highest boiling point condenses first and gets collected near the base of the fractionating column.
A. Define sublimation.
B. What are sublimable solids? Give two examples of sublimable solids.
C. State the values demonstrated by the fellow student in helping his friend to identify the samples.
Give an example for the mixture having the following characteristics. Suggest a suitable method to separate the components of the mixture.
One of the components changes directly from solid to gaseous state.
Give one simple activity/experiment to show: Ammonium chloride sublimes.
Give a reason for the following:
Naphthalene ball disappears without leaving any solid.
