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प्रश्न
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.
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उत्तर
Bromine
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संबंधित प्रश्न
Fill in the blank
All matter is made up of tiny particles called ______
What is the scientific name of particles which make up mater?
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
The best evidence for the existence and movement of particles in liquids was provided by :
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Draw a flow-chart for the schematic representation of different types of matter.
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
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
State whether the following statement is true or false :
Sponge is an example of solid sol.
What will happen if a saturated solution is :
- heated
- cooled
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
Name the process which is used in milk dairies to separate cream from milk.
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
How will you separate a mixture of iron filings, chalk powder and common salt ?
Explain how, impure copper sulphate can be purified by crystallisation.
______ is used for industrial refrigeration and transporting frozen food.
