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प्रश्न
Fill in the blank
The nature of oxide Al2O3 is ____
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उत्तर
The nature of oxide Al2O3 is amphoteric.
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संबंधित प्रश्न
Define the term ‘electron affinity’.
Electron affinity values generally _______ across the periods left to right and ______ down the group top to bottom.
Give reason:
Electronegativity of chorine is higher than Sulphur?
Explain the following:
Halogens have a high electron affinity.
Arrange the following according to the instruction given in the bracket:
F, B, N, O (In the increasing order of electron affinity).
A, B, C are three elements in which B is an inert gas other than helium. With this information complete the following table.
| Element | Atomic number | No. of electrons in the valence shell | Group to which the element belongs |
| A | Z − 1 | - | - |
| B | Z | - | - |
| C | Z + 1 | - | - |
Also, explain the following:
- Electron affinity of element A is more than that of element C.
- lonization energy of element C is less than that of element A.
- Electron affinity of B is zero.
Explain
Halogens have high electron affinity.
Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)
In a period, increase in electron affinity increases ______.
On descending a group, ______ in ionisation potential as well as electron affinity ______ oxidising capacity.
