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प्रश्न
Oxygen is very essential for us to live. It forms 21% of air by volume. Is it an element or compound?
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उत्तर
Oxygen is an element. It contains the atoms of oxygen of the same kind.
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संबंधित प्रश्न
Tick the most appropriate answer.
How many times is a proton heavier than an electron?
- 1500
- 1800
- 1840
- none of these
Give three differences between metals and non-metals.
Give one use of the following substance:
Coal
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
Tick (√) the correct alternative from the choice given for the following statement
The hardest naturally occurring substance
Write the names of elements from the following symbol:
Fe
Write the names of elements from the following symbol:
Pt
Give an example of two liquids that form heterogeneous mixtures.
Give a reason for the following statement :
The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid-liquid mixture should be moistened before placing it.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
