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प्रश्न
Name: the Hardest Naturally Occurring Substance
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उत्तर
Diamond
APPEARS IN
संबंधित प्रश्न
Give two examples of Noble gases.
Name: Two substances used to make electric wires
Find the atomicity of the Following molecule:
Carbon Monoxide
Fill in the blank
_________ refers to the number of atoms in the molecule of an element
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.
The basic unit of an element is an __________.
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
Match the following.
| 1. | Element | Made up of molecules |
| 2. | Compound | Impure substance |
| 3. | Colloid | Settles down on standing |
| 4. | Suspension | Pure substance |
| 5. | Mixture | Made up of atoms |
