Advertisements
Advertisements
प्रश्न
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Advertisements
उत्तर
An element is made up of only one kind of atoms.
APPEARS IN
संबंधित प्रश्न
All kinds 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 three important metalloids are.............................. and ..........................
What are the two types of pure substances? Give one example of each type.
The property/properties which enable copper metal to be used for making electric wires is/are :
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
What is meant by the concentration of a solution ?
One of the following represents the solution of solid in a solid. 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 ?
Name the process which can be used to recover salt from an aqueous salt solution.
Name the process by which common salt is purified.
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Solid is an arrangement of particles ______.
Higher the temperature, the higher the kinetic energy of particles.
Solids do not flow.
Give an example of a molecule.
Define the term matter.
