Advertisements
Advertisements
प्रश्न
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Advertisements
उत्तर
Chromatography is a technique that can be used to detect and identify traces of poison in the stomach of a person.
APPEARS IN
संबंधित प्रश्न
Give one difference between atoms and molecules.
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
Out of a colloid, solution and a suspension :
which one has the largest particles ?
Define solvent.
How will you test whether a given solution is a colloidal solution ?
How will you differentiate between a suspension and a colloid ?
Define Sol and give one example.
What is meant by the concentration of a solution ?
Define solubility of a substance. How does it vary with temperature ?
One of the following is a solid foam. This one is :
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Which of the following mixture cannot be separated by using water as the solvent ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Which among the following is not a matter?
Rusting of an article made up of iron is called
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
