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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
Fill in the blan
An ________ is a homogeneous mixture of two or more metals.
Answer the following question:
Why are copper and aluminium used to make electric wires?
Indicate whether the following statement is true or false:
All elements are artificially prepared
Complete the statement – an element is a pure substance made up of ____________ atoms.
Elements are classified into – Metals – Non-metals – Metalloids – Noble gases. State which of A, B, C, D is a –
1. Metallic element
2. Non-metallic element
3. Metalloid
4. Noble gas.
A: Is non-malleable, non-ductile & a poor conductor of electricity ___________
B: Has lustre, is malleable and ductile & a good conductor of heat ___________
C: Is unreactive and inert and present in traces in the air _________
D: Shows properties of both metals and non-metals ___________
Write the names of elements from the following symbol:
Zn
Write the names of elements from the following symbol:
Xe
What are elements? What are they made of?
Assertion: Air is a mixture of elements only.
Reason: Only nitrogen, oxygen and neon gases exist in air.
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.
