Advertisements
Advertisements
प्रश्न
What are the two types of pure substances? Give one example of each type.
Advertisements
उत्तर
Two types of pure substances are:
- Elements: Example: Carbon
- Compounds: Example: Sodium chloride (NaCl)
APPEARS IN
संबंधित प्रश्न
What is the scientific name of particles which make up mater?
What is meant by saying that metals are lustrous ?
Name a metal which can be easily cut with a knife.
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Define the emulsion. Give one example.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Which of the following is not an emulsion ?
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Which of the following cannot be separated from air by the process of fractional distillation ?
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Matter is made up of ______.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Diffentiate between absorption and adsorption.
______ is used for industrial refrigeration and transporting frozen food.
Compressibility of solids: ______.
