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प्रश्न
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
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उत्तर
An element is made up of only one kind of atoms.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Differentiate between an atom and a molecule.
What are the two conditions for the interconversion of states of matter ?
How would you confirm that a colourless liquid given to your is pure water ?
“Is malleable and ductile” best describes :
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Define Aerosol Give one example.
Define the emulsion. Give one example.
What is the effect of temperature on the solubility of solids in liquids ?
One of the following is a solid foam. This one is :
Which one of the following is not a chemical change ?
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
How will you separate camphor, common salt and iron nails from their mixture ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
A standard sheet of paper is about ______ of atoms thick
The phenomenon of Evaporation takes place at the ______ of a liquid.
Define the term matter.
