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प्रश्न
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
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उत्तर
A compound is a pure substance made up of two or more different elements [atoms] combined chemically in a fixed proportion.
Since one carbon atom and two oxygen atoms combine to generate one carbon dioxide molecule (CO2), we refer to the combination of carbon and oxygen as occurring in a fixed ratio of 1 : 2 to form carbon dioxide.
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संबंधित प्रश्न
Match the columns.
| column A | column B |
|
1. to separate grain from chaff |
a. filtration |
| 2. to saparate sawdust from water | b. sedimentation and deeantation |
| 3. to separate iodine from sodium chloride | c. winnowing |
| 4. to separate iron fillings from sand | d.sublimation |
|
5. it is used to separate sand and water |
e maganetic separation |
|
|
f .handpicking |
Give one example for the following types of mixtures :
solid-liquid heterogenous mixture.
Give one use of the following substance:
Iron
Tick (√) the correct alternative from the choice given for the following statement
A gaseous non-metal.
Complete the statement given below by filling in the blank with the correct word.
Element ______ has the symbol derived from its Latin name ‘Argentum’
Select the correct answer from the choice given below.
An impure substance
Select the correct answer from the choice given below.
A group of atoms of elements
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
Elements are the______ form of pure substances.
Elements contain the ______of the same kind.
