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प्रश्न
Mention three gaseous elements and write their molecular formulae
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उत्तर
| Three gaseous elements | molecular formulae. | Atoms in one Molecule |
| Hydrogen | H2 | 2 |
| Oxygen | O2 | 2 |
| Chlorine | Cl2 | 2 |
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संबंधित प्रश्न
Define the term: Element
Define: Compounds
Give Two Examples for Each of the Following: Metalloids
Give two examples of the following.
Inert gases
Fill in the blank
The most abundant element in the earth’s crust is _______.
Write an answer to the following question in your own words.
Which elements (metals and non-metals), compounds and mixtures do we use in our day-to-day life?
Select the correct answer to the statement given below:
A non-metal which exists in the liquid state.
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.
Assertion: Air is a mixture of elements only.
Reason: Only nitrogen, oxygen and neon gases exist in air.
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.
