Advertisements
Advertisements
प्रश्न
How will you separate water from mustard oil ?
उत्तर
We will separate water from mustard oil by using a separating funnel. Due to the difference in the densities of the two liquids, mustard oil, being lighter than water, floats over it and forms the upper layer, whereas water forms the lower layer. On opening the stop-cock, the lower layer of water comes out first and is collected in a beaker. Mustard oil is left behind in the separating funnel.
APPEARS IN
संबंधित प्रश्न
What are the two conditions for the interconversion of states of matter ?
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Name a metal which is soft and a non-metal which is hard.
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
Give reason why graphite is used for making elecrode in a dry cell.
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.
State whether the following statement is true or false :
Sponge is an example of solid sol.
Which of the following is not an emulsion ?
One of the following represents the solution of solid in a solid. This one is :
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Name the process by which common salt is obtained from sea-water.
Name the process by which all the dye can be recovered from black ink.
How will you separate a mixture of iron filings, chalk powder and common salt ?
The material which is added to water during purification process at the water works so as to disinfect it is :
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
Give some examples of the Tyndall effect observed in your surroundings?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
The most reactive metal is ______.
