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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
Sand is a compound of
विकल्प
silicon and nitrogen
silicon and oxygen
oxygen and sulphur
none of the above
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उत्तर
silicon and oxygen
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संबंधित प्रश्न
Define a pure substance. How many types of pure substances do you know?
Define: Molecule
Tick (√) the correct alternative from the choice given for the following statement.
Sugar is a compound which consists of the elements
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – a gas with a pungent, choking odour which is lighter than air
Complete the statement given below by filling in the blank with the correct word.
Element ______ has the symbol derived from its Latin name ‘Argentum’
Write the names of elements from the following symbol:
Fe
Represent with the help of a simple chart how matter is classified into pure or impure substances & further into elements, compounds & mixtures, with elements further segmented.
Match the following.
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
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.
