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प्रश्न
Write the names of elements from the following symbol:
Cu
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उत्तर
Cu- Copper
संबंधित प्रश्न
Give two examples of the following.
Elements which are liquids
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
Tick (√) the correct alternative from the choice given for the following statement
A gaseous non-metal.
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
Select the correct answer from the choice in the bracket.
The least reactive metal.
Elements are made up of______ kinds of atoms.
Atoms: Fundamental particle of an element::______ : Fundamental particles of a compound.
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two or more coloured constituents are soluble in some solvent.
Match the following:
| 1. | Co2 | a. | Robert Boyle |
| 2. | Sulfur | b. | Making mobile phones |
| 3. | Element | c. | triatomic molecule |
| 4. | Gallium | d. | Polyatomic molecule |
