Advertisements
Advertisements
Question
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Solution
Iron and mercury are pure substances because these are elements. Hydrochloric acid, calcium oxide, and ice are also pure substances, as they are compounds.
APPEARS IN
RELATED QUESTIONS
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
Fill in the blank
Liquids have a definite ______
Which one is a kind of matter:
A kind of matter which can sublime is
Name a non-metal which is a good conductor of electricity.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Give reason why copper metal is used for making electric wires.
Name a metal which can be easily cut with a knife.
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
Explain what happens when a beam of light is passed through a colloidal solution.
Name the different types of solutions. Give one example of each.
Name the process which is used in milk dairies to separate cream from milk.
Name the process by which all the dye can be recovered from black ink.
Explain how, impure copper sulphate can be purified by crystallisation.
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
Pure copper sulphate can be obtained from an impure sample by the process of :
______ is used for industrial refrigeration and transporting frozen food.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
Define the term matter.
