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प्रश्न
Name: the Hardest Naturally Occurring Substance
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उत्तर
Diamond
APPEARS IN
संबंधित प्रश्न
What is meant by 2H and H2
Name: Two substances used to make jewellery.
Fill in the blank
A metal which is a poor conductor of electricity is _______.
Fill in the blank
A liquid non-metal is _______.
Indicate whether the following statement is true or false:
A compound is made up of just one kind of atom
Who are my companions?
| Group 'A' | Group 'B' |
| 1. Stainless steel | (a) Non-metal |
| 2. Silver | (b) compound |
| 3. Bhajani mixture for milling | (c) Mixture |
| 4. Salt | (d) Element |
| 5. Coal | (e) Alloy |
| 6. Hydrogen | (f) Metal |
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.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which is required for combustion.
Complete the table by writing the symbols of the following elements
| Element | Symbol |
| Aluminum | Al |
| Nickel | |
| Bromine | |
| Helium | |
| Magnesium |
