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प्रश्न
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
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उत्तर
A poisonous gas almost as heavy as air is Carbon monoxide
संबंधित प्रश्न
What are the advantages of chromatography?
Give three differences between metals and non-metals.
Give reason: A frying pan is made up of steel but its handle is made up of wood.
Fill in the blank
The most abundant element in the earth’s crust is _______.
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 |
Tick (√) the correct alternative from the choice given for the following statement.
Brass and bronze are
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
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.
Give an example of two liquids that form heterogeneous mixtures.
Reason out
Elements are called semimetals.
