Advertisements
Advertisements
प्रश्न
Which of the following can be called a suspension ?
पर्याय
milk
milk of magnesia
salt solution
vinegar
उत्तर
milk of magnesia
Milk of magnesia is a suspension of magnesium hydroxide in water. It has a milk-like texture. The particles are suspended in the solvent. Milk is a colloid, whereas salt solution and vinegar are solutions.
APPEARS IN
संबंधित प्रश्न
State two characteristics of matter demonstrated by Brownian motion.
What are the characteristics of matter?
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
The property/properties which enable copper metal to be used for making electric wires is/are :
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 ?
Define solute.
Define Sol and give one example.
Define Aerosol Give one example.
What is the effect of temperature on the solubility of solids in liquids ?
Which of the following represents the solubility of sugar in water at 20°C ?
Which one of the following is not a chemical change ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
Name the process which can be used to purify an impure sample of copper sulphate.
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
How will you separate a mixture of common salt, sulphur powder and sand ?
The dyes present in fountain pen ink can be separated by the technique of :
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
The most reactive metal is ______.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
Define the term matter.