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प्रश्न
Give three reasons why – carbon dioxide is considered a compound, while carbon – an element.
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उत्तर
Carbon dioxide (C02) has a formula and properties of C02 to extinguish fire etc. are quite different from the properties it constituents carbon and oxygen. Oxygen (O) and carbon (C) are elements as these are made up of one kind of atoms. Also, carbon is combustible and oxygen is a supporter of combustion
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संबंधित प्रश्न
Give two examples of the following :
Solid + Solid mixture
Give the names and symbols of five familiar substances which you think are elements.
What is meant by atomicity? Name the diatomic element.
An atom of an element is denoted by a “symbol” Explain the meaning of the term ‘symbol’. State a reason for representing the following element by its symbol.
Helium by ‘He’
Write the formula of the compound formed – given symbols and combining power or capacity (valency) of the following element in the compound.
Ca2+ NO31-
State the type of element for the following:
Chlorine
Give the symbol of the following element:
Hydroxide
Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Copper
write symbol with the variable valency
Mass of one atom of oxygen is
Write a note on Greem symbols.
