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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
State four differences between compounds and mixtures.
Name: a Metal Which is brittle
Name A substance used as an insulator.
Give one use of the following substance:
Iron
Match the Columns:
| Column A | Column B | ||
| (a) | Metals | (i) | Non-Reactive |
| (b) | Molecules | (ii) | Brittle |
| (c) | Non-Metals | (iii) | Lustrous |
| (d) | Noble Gases | (iv) | Smallest unit of Compound |
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
Complete the statement – an element is a pure substance made up of ____________ atoms.
Write the names of elements from the following symbol:
Br
Write the names of elements from the following symbol:
Ir
Name the element which is used in toothpaste to strengthen our teeth.
