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प्रश्न
Name a non-metal which is a good conductor of electricity.
Write one example of a non-metal that is a good conductor of electricity.
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उत्तर
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संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Fill in the blank :
The state of matter with definite volume and definite shape is called______
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 ?
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
What are the three general classes of matter ? Give one example of each type.
Which of the following is not an element ?
What is the effect of temperature on the solubility of solids in liquids ?
One of the following is a solid foam. This one is :
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
Explain how, nitrogen , oxygen and argon gases are separated from air.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Gases do not diffuse very easily.
